yading@10: .\" Automatically generated by Pod::Man 2.23 (Pod::Simple 3.14) yading@10: .\" yading@10: .\" Standard preamble: yading@10: .\" ======================================================================== yading@10: .de Sp \" Vertical space (when we can't use .PP) yading@10: .if t .sp .5v yading@10: .if n .sp yading@10: .. yading@10: .de Vb \" Begin verbatim text yading@10: .ft CW yading@10: .nf yading@10: .ne \\$1 yading@10: .. yading@10: .de Ve \" End verbatim text yading@10: .ft R yading@10: .fi yading@10: .. yading@10: .\" Set up some character translations and predefined strings. \*(-- will yading@10: .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left yading@10: .\" double quote, and \*(R" will give a right double quote. \*(C+ will yading@10: .\" give a nicer C++. Capital omega is used to do unbreakable dashes and yading@10: .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, yading@10: .\" nothing in troff, for use with C<>. yading@10: .tr \(*W- yading@10: .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' yading@10: .ie n \{\ yading@10: . ds -- \(*W- yading@10: . ds PI pi yading@10: . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch yading@10: . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch yading@10: . ds L" "" yading@10: . ds R" "" yading@10: . ds C` "" yading@10: . ds C' "" yading@10: 'br\} yading@10: .el\{\ yading@10: . ds -- \|\(em\| yading@10: . ds PI \(*p yading@10: . ds L" `` yading@10: . ds R" '' yading@10: 'br\} yading@10: .\" yading@10: .\" Escape single quotes in literal strings from groff's Unicode transform. yading@10: .ie \n(.g .ds Aq \(aq yading@10: .el .ds Aq ' yading@10: .\" yading@10: .\" If the F register is turned on, we'll generate index entries on stderr for yading@10: .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index yading@10: .\" entries marked with X<> in POD. Of course, you'll have to process the yading@10: .\" output yourself in some meaningful fashion. yading@10: .ie \nF \{\ yading@10: . de IX yading@10: . tm Index:\\$1\t\\n%\t"\\$2" yading@10: .. yading@10: . nr % 0 yading@10: . rr F yading@10: .\} yading@10: .el \{\ yading@10: . de IX yading@10: .. yading@10: .\} yading@10: .\" yading@10: .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). yading@10: .\" Fear. Run. Save yourself. No user-serviceable parts. yading@10: . \" fudge factors for nroff and troff yading@10: .if n \{\ yading@10: . ds #H 0 yading@10: . ds #V .8m yading@10: . ds #F .3m yading@10: . ds #[ \f1 yading@10: . ds #] \fP yading@10: .\} yading@10: .if t \{\ yading@10: . ds #H ((1u-(\\\\n(.fu%2u))*.13m) yading@10: . ds #V .6m yading@10: . ds #F 0 yading@10: . ds #[ \& yading@10: . ds #] \& yading@10: .\} yading@10: . \" simple accents for nroff and troff yading@10: .if n \{\ yading@10: . ds ' \& yading@10: . ds ` \& yading@10: . ds ^ \& yading@10: . ds , \& yading@10: . ds ~ ~ yading@10: . ds / yading@10: .\} yading@10: .if t \{\ yading@10: . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" yading@10: . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' yading@10: . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' yading@10: . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' yading@10: . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' yading@10: . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' yading@10: .\} yading@10: . \" troff and (daisy-wheel) nroff accents yading@10: .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' yading@10: .ds 8 \h'\*(#H'\(*b\h'-\*(#H' yading@10: .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] yading@10: .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' yading@10: .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' yading@10: .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] yading@10: .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] yading@10: .ds ae a\h'-(\w'a'u*4/10)'e yading@10: .ds Ae A\h'-(\w'A'u*4/10)'E yading@10: . \" corrections for vroff yading@10: .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' yading@10: .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' yading@10: . \" for low resolution devices (crt and lpr) yading@10: .if \n(.H>23 .if \n(.V>19 \ yading@10: \{\ yading@10: . ds : e yading@10: . ds 8 ss yading@10: . ds o a yading@10: . ds d- d\h'-1'\(ga yading@10: . ds D- D\h'-1'\(hy yading@10: . ds th \o'bp' yading@10: . ds Th \o'LP' yading@10: . ds ae ae yading@10: . ds Ae AE yading@10: .\} yading@10: .rm #[ #] #H #V #F C yading@10: .\" ======================================================================== yading@10: .\" yading@10: .IX Title "FFMPEG-FILTERS 1" yading@10: .TH FFMPEG-FILTERS 1 "2013-04-21" " " " " yading@10: .\" For nroff, turn off justification. Always turn off hyphenation; it makes yading@10: .\" way too many mistakes in technical documents. yading@10: .if n .ad l yading@10: .nh yading@10: .SH "NAME" yading@10: ffmpeg\-filters \- FFmpeg filters yading@10: .SH "DESCRIPTION" yading@10: .IX Header "DESCRIPTION" yading@10: This document describes filters, sources, and sinks provided by the yading@10: libavfilter library. yading@10: .SH "FILTERING INTRODUCTION" yading@10: .IX Header "FILTERING INTRODUCTION" yading@10: Filtering in FFmpeg is enabled through the libavfilter library. yading@10: .PP yading@10: In libavfilter, a filter can have multiple inputs and multiple yading@10: outputs. yading@10: To illustrate the sorts of things that are possible, we consider the yading@10: following filtergraph. yading@10: .PP yading@10: .Vb 4 yading@10: \& input \-\-> split \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-> overlay \-\-> output yading@10: \& | ^ yading@10: \& | | yading@10: \& +\-\-\-\-\-> crop \-\-> vflip \-\-\-\-\-\-\-+ yading@10: .Ve yading@10: .PP yading@10: This filtergraph splits the input stream in two streams, sends one yading@10: stream through the crop filter and the vflip filter before merging it yading@10: back with the other stream by overlaying it on top. You can use the yading@10: following command to achieve this: yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i INPUT \-vf "split [main][tmp]; [tmp] crop=iw:ih/2:0:0, vflip [flip]; [main][flip] overlay=0:H/2" OUTPUT yading@10: .Ve yading@10: .PP yading@10: The result will be that in output the top half of the video is mirrored yading@10: onto the bottom half. yading@10: .PP yading@10: Filters in the same linear chain are separated by commas, and distinct yading@10: linear chains of filters are separated by semicolons. In our example, yading@10: \&\fIcrop,vflip\fR are in one linear chain, \fIsplit\fR and yading@10: \&\fIoverlay\fR are separately in another. The points where the linear yading@10: chains join are labelled by names enclosed in square brackets. In the yading@10: example, the split filter generates two outputs that are associated to yading@10: the labels \fI[main]\fR and \fI[tmp]\fR. yading@10: .PP yading@10: The stream sent to the second output of \fIsplit\fR, labelled as yading@10: \&\fI[tmp]\fR, is processed through the \fIcrop\fR filter, which crops yading@10: away the lower half part of the video, and then vertically flipped. The yading@10: \&\fIoverlay\fR filter takes in input the first unchanged output of the yading@10: split filter (which was labelled as \fI[main]\fR), and overlay on its yading@10: lower half the output generated by the \fIcrop,vflip\fR filterchain. yading@10: .PP yading@10: Some filters take in input a list of parameters: they are specified yading@10: after the filter name and an equal sign, and are separated from each other yading@10: by a colon. yading@10: .PP yading@10: There exist so-called \fIsource filters\fR that do not have an yading@10: audio/video input, and \fIsink filters\fR that will not have audio/video yading@10: output. yading@10: .SH "GRAPH" yading@10: .IX Header "GRAPH" yading@10: The \fIgraph2dot\fR program included in the FFmpeg \fItools\fR yading@10: directory can be used to parse a filtergraph description and issue a yading@10: corresponding textual representation in the dot language. yading@10: .PP yading@10: Invoke the command: yading@10: .PP yading@10: .Vb 1 yading@10: \& graph2dot \-h yading@10: .Ve yading@10: .PP yading@10: to see how to use \fIgraph2dot\fR. yading@10: .PP yading@10: You can then pass the dot description to the \fIdot\fR program (from yading@10: the graphviz suite of programs) and obtain a graphical representation yading@10: of the filtergraph. yading@10: .PP yading@10: For example the sequence of commands: yading@10: .PP yading@10: .Vb 4 yading@10: \& echo | \e yading@10: \& tools/graph2dot \-o graph.tmp && \e yading@10: \& dot \-Tpng graph.tmp \-o graph.png && \e yading@10: \& display graph.png yading@10: .Ve yading@10: .PP yading@10: can be used to create and display an image representing the graph yading@10: described by the \fI\s-1GRAPH_DESCRIPTION\s0\fR string. Note that this string must be yading@10: a complete self-contained graph, with its inputs and outputs explicitly defined. yading@10: For example if your command line is of the form: yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i infile \-vf scale=640:360 outfile yading@10: .Ve yading@10: .PP yading@10: your \fI\s-1GRAPH_DESCRIPTION\s0\fR string will need to be of the form: yading@10: .PP yading@10: .Vb 1 yading@10: \& nullsrc,scale=640:360,nullsink yading@10: .Ve yading@10: .PP yading@10: you may also need to set the \fInullsrc\fR parameters and add a \fIformat\fR yading@10: filter in order to simulate a specific input file. yading@10: .SH "FILTERGRAPH DESCRIPTION" yading@10: .IX Header "FILTERGRAPH DESCRIPTION" yading@10: A filtergraph is a directed graph of connected filters. It can contain yading@10: cycles, and there can be multiple links between a pair of yading@10: filters. Each link has one input pad on one side connecting it to one yading@10: filter from which it takes its input, and one output pad on the other yading@10: side connecting it to the one filter accepting its output. yading@10: .PP yading@10: Each filter in a filtergraph is an instance of a filter class yading@10: registered in the application, which defines the features and the yading@10: number of input and output pads of the filter. yading@10: .PP yading@10: A filter with no input pads is called a \*(L"source\*(R", a filter with no yading@10: output pads is called a \*(L"sink\*(R". yading@10: .SS "Filtergraph syntax" yading@10: .IX Subsection "Filtergraph syntax" yading@10: A filtergraph can be represented using a textual representation, which is yading@10: recognized by the \fB\-filter\fR/\fB\-vf\fR and \fB\-filter_complex\fR yading@10: options in \fBffmpeg\fR and \fB\-vf\fR in \fBffplay\fR, and by the yading@10: \&\f(CW\*(C`avfilter_graph_parse()\*(C'\fR/\f(CW\*(C`avfilter_graph_parse2()\*(C'\fR function defined in yading@10: \&\fIlibavfilter/avfilter.h\fR. yading@10: .PP yading@10: A filterchain consists of a sequence of connected filters, each one yading@10: connected to the previous one in the sequence. A filterchain is yading@10: represented by a list of \*(L",\*(R"\-separated filter descriptions. yading@10: .PP yading@10: A filtergraph consists of a sequence of filterchains. A sequence of yading@10: filterchains is represented by a list of \*(L";\*(R"\-separated filterchain yading@10: descriptions. yading@10: .PP yading@10: A filter is represented by a string of the form: yading@10: [\fIin_link_1\fR]...[\fIin_link_N\fR]\fIfilter_name\fR=\fIarguments\fR[\fIout_link_1\fR]...[\fIout_link_M\fR] yading@10: .PP yading@10: \&\fIfilter_name\fR is the name of the filter class of which the yading@10: described filter is an instance of, and has to be the name of one of yading@10: the filter classes registered in the program. yading@10: The name of the filter class is optionally followed by a string yading@10: "=\fIarguments\fR". yading@10: .PP yading@10: \&\fIarguments\fR is a string which contains the parameters used to yading@10: initialize the filter instance. It may have one of the following forms: yading@10: .IP "\(bu" 4 yading@10: A ':'\-separated list of \fIkey=value\fR pairs. yading@10: .IP "\(bu" 4 yading@10: A ':'\-separated list of \fIvalue\fR. In this case, the keys are assumed to be yading@10: the option names in the order they are declared. E.g. the \f(CW\*(C`fade\*(C'\fR filter yading@10: declares three options in this order \*(-- \fBtype\fR, \fBstart_frame\fR and yading@10: \&\fBnb_frames\fR. Then the parameter list \fIin:0:30\fR means that the value yading@10: \&\fIin\fR is assigned to the option \fBtype\fR, \fI0\fR to yading@10: \&\fBstart_frame\fR and \fI30\fR to \fBnb_frames\fR. yading@10: .IP "\(bu" 4 yading@10: A ':'\-separated list of mixed direct \fIvalue\fR and long \fIkey=value\fR yading@10: pairs. The direct \fIvalue\fR must precede the \fIkey=value\fR pairs, and yading@10: follow the same constraints order of the previous point. The following yading@10: \&\fIkey=value\fR pairs can be set in any preferred order. yading@10: .PP yading@10: If the option value itself is a list of items (e.g. the \f(CW\*(C`format\*(C'\fR filter yading@10: takes a list of pixel formats), the items in the list are usually separated by yading@10: \&'|'. yading@10: .PP yading@10: The list of arguments can be quoted using the character \*(L"'\*(R" as initial yading@10: and ending mark, and the character '\e' for escaping the characters yading@10: within the quoted text; otherwise the argument string is considered yading@10: terminated when the next special character (belonging to the set yading@10: \&\*(L"[]=;,\*(R") is encountered. yading@10: .PP yading@10: The name and arguments of the filter are optionally preceded and yading@10: followed by a list of link labels. yading@10: A link label allows to name a link and associate it to a filter output yading@10: or input pad. The preceding labels \fIin_link_1\fR yading@10: \&... \fIin_link_N\fR, are associated to the filter input pads, yading@10: the following labels \fIout_link_1\fR ... \fIout_link_M\fR, are yading@10: associated to the output pads. yading@10: .PP yading@10: When two link labels with the same name are found in the yading@10: filtergraph, a link between the corresponding input and output pad is yading@10: created. yading@10: .PP yading@10: If an output pad is not labelled, it is linked by default to the first yading@10: unlabelled input pad of the next filter in the filterchain. yading@10: For example in the filterchain: yading@10: .PP yading@10: .Vb 1 yading@10: \& nullsrc, split[L1], [L2]overlay, nullsink yading@10: .Ve yading@10: .PP yading@10: the split filter instance has two output pads, and the overlay filter yading@10: instance two input pads. The first output pad of split is labelled yading@10: \&\*(L"L1\*(R", the first input pad of overlay is labelled \*(L"L2\*(R", and the second yading@10: output pad of split is linked to the second input pad of overlay, yading@10: which are both unlabelled. yading@10: .PP yading@10: In a complete filterchain all the unlabelled filter input and output yading@10: pads must be connected. A filtergraph is considered valid if all the yading@10: filter input and output pads of all the filterchains are connected. yading@10: .PP yading@10: Libavfilter will automatically insert scale filters where format yading@10: conversion is required. It is possible to specify swscale flags yading@10: for those automatically inserted scalers by prepending yading@10: \&\f(CW\*(C`sws_flags=\f(CIflags\f(CW;\*(C'\fR yading@10: to the filtergraph description. yading@10: .PP yading@10: Follows a \s-1BNF\s0 description for the filtergraph syntax: yading@10: .PP yading@10: .Vb 7 yading@10: \& ::= sequence of alphanumeric characters and \*(Aq_\*(Aq yading@10: \& ::= "[" "]" yading@10: \& ::= [] yading@10: \& ::= sequence of chars (eventually quoted) yading@10: \& ::= [] ["=" ] [] yading@10: \& ::= [,] yading@10: \& ::= [sws_flags=;] [;] yading@10: .Ve yading@10: .SS "Notes on filtergraph escaping" yading@10: .IX Subsection "Notes on filtergraph escaping" yading@10: Some filter arguments require the use of special characters, typically yading@10: \&\f(CW\*(C`:\*(C'\fR to separate key=value pairs in a named options list. In this yading@10: case the user should perform a first level escaping when specifying yading@10: the filter arguments. For example, consider the following literal yading@10: string to be embedded in the drawtext filter arguments: yading@10: .PP yading@10: .Vb 1 yading@10: \& this is a \*(Aqstring\*(Aq: may contain one, or more, special characters yading@10: .Ve yading@10: .PP yading@10: Since \f(CW\*(C`:\*(C'\fR is special for the filter arguments syntax, it needs to yading@10: be escaped, so you get: yading@10: .PP yading@10: .Vb 1 yading@10: \& text=this is a \e\*(Aqstring\e\*(Aq\e: may contain one, or more, special characters yading@10: .Ve yading@10: .PP yading@10: A second level of escaping is required when embedding the filter yading@10: arguments in a filtergraph description, in order to escape all the yading@10: filtergraph special characters. Thus the example above becomes: yading@10: .PP yading@10: .Vb 1 yading@10: \& drawtext=text=this is a \e\e\e\*(Aqstring\e\e\e\*(Aq\e\e: may contain one\e, or more\e, special characters yading@10: .Ve yading@10: .PP yading@10: Finally an additional level of escaping may be needed when writing the yading@10: filtergraph description in a shell command, which depends on the yading@10: escaping rules of the adopted shell. For example, assuming that yading@10: \&\f(CW\*(C`\e\*(C'\fR is special and needs to be escaped with another \f(CW\*(C`\e\*(C'\fR, the yading@10: previous string will finally result in: yading@10: .PP yading@10: .Vb 1 yading@10: \& \-vf "drawtext=text=this is a \e\e\e\e\e\e\*(Aqstring\e\e\e\e\e\e\*(Aq\e\e\e\e: may contain one\e\e, or more\e\e, special characters" yading@10: .Ve yading@10: .PP yading@10: Sometimes, it might be more convenient to employ quoting in place of yading@10: escaping. For example the string: yading@10: .PP yading@10: .Vb 1 yading@10: \& Caesar: tu quoque, Brute, fili mi yading@10: .Ve yading@10: .PP yading@10: Can be quoted in the filter arguments as: yading@10: .PP yading@10: .Vb 1 yading@10: \& text=\*(AqCaesar: tu quoque, Brute, fili mi\*(Aq yading@10: .Ve yading@10: .PP yading@10: And finally inserted in a filtergraph like: yading@10: .PP yading@10: .Vb 1 yading@10: \& drawtext=text=\e\*(AqCaesar: tu quoque\e, Brute\e, fili mi\e\*(Aq yading@10: .Ve yading@10: .PP yading@10: See the ``Quoting and escaping'' section in the ffmpeg-utils manual yading@10: for more information about the escaping and quoting rules adopted by yading@10: FFmpeg. yading@10: .SH "AUDIO FILTERS" yading@10: .IX Header "AUDIO FILTERS" yading@10: When you configure your FFmpeg build, you can disable any of the yading@10: existing filters using \f(CW\*(C`\-\-disable\-filters\*(C'\fR. yading@10: The configure output will show the audio filters included in your yading@10: build. yading@10: .PP yading@10: Below is a description of the currently available audio filters. yading@10: .SS "aconvert" yading@10: .IX Subsection "aconvert" yading@10: Convert the input audio format to the specified formats. yading@10: .PP yading@10: \&\fIThis filter is deprecated. Use aformat\fR instead. yading@10: .PP yading@10: The filter accepts a string of the form: yading@10: "\fIsample_format\fR:\fIchannel_layout\fR". yading@10: .PP yading@10: \&\fIsample_format\fR specifies the sample format, and can be a string or the yading@10: corresponding numeric value defined in \fIlibavutil/samplefmt.h\fR. Use 'p' yading@10: suffix for a planar sample format. yading@10: .PP yading@10: \&\fIchannel_layout\fR specifies the channel layout, and can be a string yading@10: or the corresponding number value defined in \fIlibavutil/channel_layout.h\fR. yading@10: .PP yading@10: The special parameter \*(L"auto\*(R", signifies that the filter will yading@10: automatically select the output format depending on the output filter. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Convert input to float, planar, stereo: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aconvert=fltp:stereo yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Convert input to unsigned 8\-bit, automatically select out channel layout: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aconvert=u8:auto yading@10: .Ve yading@10: .SS "allpass" yading@10: .IX Subsection "allpass" yading@10: Apply a two-pole all-pass filter with central frequency (in Hz) yading@10: \&\fIfrequency\fR, and filter-width \fIwidth\fR. yading@10: An all-pass filter changes the audio's frequency to phase relationship yading@10: without changing its frequency to amplitude relationship. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set frequency in Hz. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: .SS "highpass" yading@10: .IX Subsection "highpass" yading@10: Apply a high-pass filter with 3dB point frequency. yading@10: The filter can be either single-pole, or double-pole (the default). yading@10: The filter roll off at 6dB per pole per octave (20dB per pole per decade). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set frequency in Hz. Default is 3000. yading@10: .IP "\fBpoles, p\fR" 4 yading@10: .IX Item "poles, p" yading@10: Set number of poles. Default is 2. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: Applies only to double-pole filter. yading@10: The default is 0.707q and gives a Butterworth response. yading@10: .SS "lowpass" yading@10: .IX Subsection "lowpass" yading@10: Apply a low-pass filter with 3dB point frequency. yading@10: The filter can be either single-pole or double-pole (the default). yading@10: The filter roll off at 6dB per pole per octave (20dB per pole per decade). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set frequency in Hz. Default is 500. yading@10: .IP "\fBpoles, p\fR" 4 yading@10: .IX Item "poles, p" yading@10: Set number of poles. Default is 2. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: Applies only to double-pole filter. yading@10: The default is 0.707q and gives a Butterworth response. yading@10: .SS "bass" yading@10: .IX Subsection "bass" yading@10: Boost or cut the bass (lower) frequencies of the audio using a two-pole yading@10: shelving filter with a response similar to that of a standard yading@10: hi-fi's tone-controls. This is also known as shelving equalisation (\s-1EQ\s0). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBgain, g\fR" 4 yading@10: .IX Item "gain, g" yading@10: Give the gain at 0 Hz. Its useful range is about \-20 yading@10: (for a large cut) to +20 (for a large boost). yading@10: Beware of clipping when using a positive gain. yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the filter's central frequency and so can be used yading@10: to extend or reduce the frequency range to be boosted or cut. yading@10: The default value is \f(CW100\fR Hz. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Determine how steep is the filter's shelf transition. yading@10: .SS "treble" yading@10: .IX Subsection "treble" yading@10: Boost or cut treble (upper) frequencies of the audio using a two-pole yading@10: shelving filter with a response similar to that of a standard yading@10: hi-fi's tone-controls. This is also known as shelving equalisation (\s-1EQ\s0). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBgain, g\fR" 4 yading@10: .IX Item "gain, g" yading@10: Give the gain at whichever is the lower of ~22 kHz and the yading@10: Nyquist frequency. Its useful range is about \-20 (for a large cut) yading@10: to +20 (for a large boost). Beware of clipping when using a positive gain. yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the filter's central frequency and so can be used yading@10: to extend or reduce the frequency range to be boosted or cut. yading@10: The default value is \f(CW3000\fR Hz. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Determine how steep is the filter's shelf transition. yading@10: .SS "bandpass" yading@10: .IX Subsection "bandpass" yading@10: Apply a two-pole Butterworth band-pass filter with central yading@10: frequency \fIfrequency\fR, and (3dB\-point) band-width width. yading@10: The \fIcsg\fR option selects a constant skirt gain (peak gain = Q) yading@10: instead of the default: constant 0dB peak gain. yading@10: The filter roll off at 6dB per octave (20dB per decade). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the filter's central frequency. Default is \f(CW3000\fR. yading@10: .IP "\fBcsg\fR" 4 yading@10: .IX Item "csg" yading@10: Constant skirt gain if set to 1. Defaults to 0. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: .SS "bandreject" yading@10: .IX Subsection "bandreject" yading@10: Apply a two-pole Butterworth band-reject filter with central yading@10: frequency \fIfrequency\fR, and (3dB\-point) band-width \fIwidth\fR. yading@10: The filter roll off at 6dB per octave (20dB per decade). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the filter's central frequency. Default is \f(CW3000\fR. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: .SS "biquad" yading@10: .IX Subsection "biquad" yading@10: Apply a biquad \s-1IIR\s0 filter with the given coefficients. yading@10: Where \fIb0\fR, \fIb1\fR, \fIb2\fR and \fIa0\fR, \fIa1\fR, \fIa2\fR yading@10: are the numerator and denominator coefficients respectively. yading@10: .SS "equalizer" yading@10: .IX Subsection "equalizer" yading@10: Apply a two-pole peaking equalisation (\s-1EQ\s0) filter. With this yading@10: filter, the signal-level at and around a selected frequency can yading@10: be increased or decreased, whilst (unlike bandpass and bandreject yading@10: filters) that at all other frequencies is unchanged. yading@10: .PP yading@10: In order to produce complex equalisation curves, this filter can yading@10: be given several times, each with a different central frequency. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the filter's central frequency in Hz. yading@10: .IP "\fBwidth_type\fR" 4 yading@10: .IX Item "width_type" yading@10: Set method to specify band-width of filter. yading@10: .RS 4 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Hz yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: Q\-Factor yading@10: .IP "\fBo\fR" 4 yading@10: .IX Item "o" yading@10: octave yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: slope yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Specify the band-width of a filter in width_type units. yading@10: .IP "\fBgain, g\fR" 4 yading@10: .IX Item "gain, g" yading@10: Set the required gain or attenuation in dB. yading@10: Beware of clipping when using a positive gain. yading@10: .SS "afade" yading@10: .IX Subsection "afade" yading@10: Apply fade\-in/out effect to input audio. yading@10: .PP yading@10: A description of the accepted parameters follows. yading@10: .IP "\fBtype, t\fR" 4 yading@10: .IX Item "type, t" yading@10: Specify the effect type, can be either \f(CW\*(C`in\*(C'\fR for fade-in, or yading@10: \&\f(CW\*(C`out\*(C'\fR for a fade-out effect. Default is \f(CW\*(C`in\*(C'\fR. yading@10: .IP "\fBstart_sample, ss\fR" 4 yading@10: .IX Item "start_sample, ss" yading@10: Specify the number of the start sample for starting to apply the fade yading@10: effect. Default is 0. yading@10: .IP "\fBnb_samples, ns\fR" 4 yading@10: .IX Item "nb_samples, ns" yading@10: Specify the number of samples for which the fade effect has to last. At yading@10: the end of the fade-in effect the output audio will have the same yading@10: volume as the input audio, at the end of the fade-out transition yading@10: the output audio will be silence. Default is 44100. yading@10: .IP "\fBstart_time, st\fR" 4 yading@10: .IX Item "start_time, st" yading@10: Specify time for starting to apply the fade effect. Default is 0. yading@10: The accepted syntax is: yading@10: .Sp yading@10: .Vb 2 yading@10: \& [\-]HH[:MM[:SS[.m...]]] yading@10: \& [\-]S+[.m...] yading@10: .Ve yading@10: .Sp yading@10: See also the function \f(CW\*(C`av_parse_time()\*(C'\fR. yading@10: If set this option is used instead of \fIstart_sample\fR one. yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Specify the duration for which the fade effect has to last. Default is 0. yading@10: The accepted syntax is: yading@10: .Sp yading@10: .Vb 2 yading@10: \& [\-]HH[:MM[:SS[.m...]]] yading@10: \& [\-]S+[.m...] yading@10: .Ve yading@10: .Sp yading@10: See also the function \f(CW\*(C`av_parse_time()\*(C'\fR. yading@10: At the end of the fade-in effect the output audio will have the same yading@10: volume as the input audio, at the end of the fade-out transition yading@10: the output audio will be silence. yading@10: If set this option is used instead of \fInb_samples\fR one. yading@10: .IP "\fBcurve\fR" 4 yading@10: .IX Item "curve" yading@10: Set curve for fade transition. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBtri\fR" 4 yading@10: .IX Item "tri" yading@10: select triangular, linear slope (default) yading@10: .IP "\fBqsin\fR" 4 yading@10: .IX Item "qsin" yading@10: select quarter of sine wave yading@10: .IP "\fBhsin\fR" 4 yading@10: .IX Item "hsin" yading@10: select half of sine wave yading@10: .IP "\fBesin\fR" 4 yading@10: .IX Item "esin" yading@10: select exponential sine wave yading@10: .IP "\fBlog\fR" 4 yading@10: .IX Item "log" yading@10: select logarithmic yading@10: .IP "\fBpar\fR" 4 yading@10: .IX Item "par" yading@10: select inverted parabola yading@10: .IP "\fBqua\fR" 4 yading@10: .IX Item "qua" yading@10: select quadratic yading@10: .IP "\fBcub\fR" 4 yading@10: .IX Item "cub" yading@10: select cubic yading@10: .IP "\fBsqu\fR" 4 yading@10: .IX Item "squ" yading@10: select square root yading@10: .IP "\fBcbr\fR" 4 yading@10: .IX Item "cbr" yading@10: select cubic root yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Fade in first 15 seconds of audio: yading@10: .Sp yading@10: .Vb 1 yading@10: \& afade=t=in:ss=0:d=15 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Fade out last 25 seconds of a 900 seconds audio: yading@10: .Sp yading@10: .Vb 1 yading@10: \& afade=t=out:ss=875:d=25 yading@10: .Ve yading@10: .SS "aformat" yading@10: .IX Subsection "aformat" yading@10: Set output format constraints for the input audio. The framework will yading@10: negotiate the most appropriate format to minimize conversions. yading@10: .PP yading@10: The filter accepts the following named parameters: yading@10: .IP "\fBsample_fmts\fR" 4 yading@10: .IX Item "sample_fmts" yading@10: A '|'\-separated list of requested sample formats. yading@10: .IP "\fBsample_rates\fR" 4 yading@10: .IX Item "sample_rates" yading@10: A '|'\-separated list of requested sample rates. yading@10: .IP "\fBchannel_layouts\fR" 4 yading@10: .IX Item "channel_layouts" yading@10: A '|'\-separated list of requested channel layouts. yading@10: .PP yading@10: If a parameter is omitted, all values are allowed. yading@10: .PP yading@10: For example to force the output to either unsigned 8\-bit or signed 16\-bit stereo: yading@10: .PP yading@10: .Vb 1 yading@10: \& aformat=sample_fmts=u8|s16:channel_layouts=stereo yading@10: .Ve yading@10: .SS "amerge" yading@10: .IX Subsection "amerge" yading@10: Merge two or more audio streams into a single multi-channel stream. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBinputs\fR" 4 yading@10: .IX Item "inputs" yading@10: Set the number of inputs. Default is 2. yading@10: .PP yading@10: If the channel layouts of the inputs are disjoint, and therefore compatible, yading@10: the channel layout of the output will be set accordingly and the channels yading@10: will be reordered as necessary. If the channel layouts of the inputs are not yading@10: disjoint, the output will have all the channels of the first input then all yading@10: the channels of the second input, in that order, and the channel layout of yading@10: the output will be the default value corresponding to the total number of yading@10: channels. yading@10: .PP yading@10: For example, if the first input is in 2.1 (\s-1FL+FR+LF\s0) and the second input yading@10: is \s-1FC+BL+BR\s0, then the output will be in 5.1, with the channels in the yading@10: following order: a1, a2, b1, a3, b2, b3 (a1 is the first channel of the yading@10: first input, b1 is the first channel of the second input). yading@10: .PP yading@10: On the other hand, if both input are in stereo, the output channels will be yading@10: in the default order: a1, a2, b1, b2, and the channel layout will be yading@10: arbitrarily set to 4.0, which may or may not be the expected value. yading@10: .PP yading@10: All inputs must have the same sample rate, and format. yading@10: .PP yading@10: If inputs do not have the same duration, the output will stop with the yading@10: shortest. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Merge two mono files into a stereo stream: yading@10: .Sp yading@10: .Vb 1 yading@10: \& amovie=left.wav [l] ; amovie=right.mp3 [r] ; [l] [r] amerge yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Multiple merges assuming 1 video stream and 6 audio streams in \fIinput.mkv\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i input.mkv \-filter_complex "[0:1][0:2][0:3][0:4][0:5][0:6] amerge=inputs=6" \-c:a pcm_s16le output.mkv yading@10: .Ve yading@10: .SS "amix" yading@10: .IX Subsection "amix" yading@10: Mixes multiple audio inputs into a single output. yading@10: .PP yading@10: For example yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i INPUT1 \-i INPUT2 \-i INPUT3 \-filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT yading@10: .Ve yading@10: .PP yading@10: will mix 3 input audio streams to a single output with the same duration as the yading@10: first input and a dropout transition time of 3 seconds. yading@10: .PP yading@10: The filter accepts the following named parameters: yading@10: .IP "\fBinputs\fR" 4 yading@10: .IX Item "inputs" yading@10: Number of inputs. If unspecified, it defaults to 2. yading@10: .IP "\fBduration\fR" 4 yading@10: .IX Item "duration" yading@10: How to determine the end-of-stream. yading@10: .RS 4 yading@10: .IP "\fBlongest\fR" 4 yading@10: .IX Item "longest" yading@10: Duration of longest input. (default) yading@10: .IP "\fBshortest\fR" 4 yading@10: .IX Item "shortest" yading@10: Duration of shortest input. yading@10: .IP "\fBfirst\fR" 4 yading@10: .IX Item "first" yading@10: Duration of first input. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBdropout_transition\fR" 4 yading@10: .IX Item "dropout_transition" yading@10: Transition time, in seconds, for volume renormalization when an input yading@10: stream ends. The default value is 2 seconds. yading@10: .SS "anull" yading@10: .IX Subsection "anull" yading@10: Pass the audio source unchanged to the output. yading@10: .SS "apad" yading@10: .IX Subsection "apad" yading@10: Pad the end of a audio stream with silence, this can be used together with yading@10: \&\-shortest to extend audio streams to the same length as the video stream. yading@10: .SS "aphaser" yading@10: .IX Subsection "aphaser" yading@10: Add a phasing effect to the input audio. yading@10: .PP yading@10: A phaser filter creates series of peaks and troughs in the frequency spectrum. yading@10: The position of the peaks and troughs are modulated so that they vary over time, creating a sweeping effect. yading@10: .PP yading@10: A description of the accepted parameters follows. yading@10: .IP "\fBin_gain\fR" 4 yading@10: .IX Item "in_gain" yading@10: Set input gain. Default is 0.4. yading@10: .IP "\fBout_gain\fR" 4 yading@10: .IX Item "out_gain" yading@10: Set output gain. Default is 0.74 yading@10: .IP "\fBdelay\fR" 4 yading@10: .IX Item "delay" yading@10: Set delay in milliseconds. Default is 3.0. yading@10: .IP "\fBdecay\fR" 4 yading@10: .IX Item "decay" yading@10: Set decay. Default is 0.4. yading@10: .IP "\fBspeed\fR" 4 yading@10: .IX Item "speed" yading@10: Set modulation speed in Hz. Default is 0.5. yading@10: .IP "\fBtype\fR" 4 yading@10: .IX Item "type" yading@10: Set modulation type. Default is triangular. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBtriangular, t\fR" 4 yading@10: .IX Item "triangular, t" yading@10: .PD 0 yading@10: .IP "\fBsinusoidal, s\fR" 4 yading@10: .IX Item "sinusoidal, s" yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PD yading@10: .SS "aresample" yading@10: .IX Subsection "aresample" yading@10: Resample the input audio to the specified parameters, using the yading@10: libswresample library. If none are specified then the filter will yading@10: automatically convert between its input and output. yading@10: .PP yading@10: This filter is also able to stretch/squeeze the audio data to make it match yading@10: the timestamps or to inject silence / cut out audio to make it match the yading@10: timestamps, do a combination of both or do neither. yading@10: .PP yading@10: The filter accepts the syntax yading@10: [\fIsample_rate\fR:]\fIresampler_options\fR, where \fIsample_rate\fR yading@10: expresses a sample rate and \fIresampler_options\fR is a list of yading@10: \&\fIkey\fR=\fIvalue\fR pairs, separated by \*(L":\*(R". See the yading@10: ffmpeg-resampler manual for the complete list of supported options. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Resample the input audio to 44100Hz: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aresample=44100 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Stretch/squeeze samples to the given timestamps, with a maximum of 1000 yading@10: samples per second compensation: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aresample=async=1000 yading@10: .Ve yading@10: .SS "asetnsamples" yading@10: .IX Subsection "asetnsamples" yading@10: Set the number of samples per each output audio frame. yading@10: .PP yading@10: The last output packet may contain a different number of samples, as yading@10: the filter will flush all the remaining samples when the input audio yading@10: signal its end. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBnb_out_samples, n\fR" 4 yading@10: .IX Item "nb_out_samples, n" yading@10: Set the number of frames per each output audio frame. The number is yading@10: intended as the number of samples \fIper each channel\fR. yading@10: Default value is 1024. yading@10: .IP "\fBpad, p\fR" 4 yading@10: .IX Item "pad, p" yading@10: If set to 1, the filter will pad the last audio frame with zeroes, so yading@10: that the last frame will contain the same number of samples as the yading@10: previous ones. Default value is 1. yading@10: .PP yading@10: For example, to set the number of per-frame samples to 1234 and yading@10: disable padding for the last frame, use: yading@10: .PP yading@10: .Vb 1 yading@10: \& asetnsamples=n=1234:p=0 yading@10: .Ve yading@10: .SS "ashowinfo" yading@10: .IX Subsection "ashowinfo" yading@10: Show a line containing various information for each input audio frame. yading@10: The input audio is not modified. yading@10: .PP yading@10: The shown line contains a sequence of key/value pairs of the form yading@10: \&\fIkey\fR:\fIvalue\fR. yading@10: .PP yading@10: A description of each shown parameter follows: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: sequential number of the input frame, starting from 0 yading@10: .IP "\fBpts\fR" 4 yading@10: .IX Item "pts" yading@10: Presentation timestamp of the input frame, in time base units; the time base yading@10: depends on the filter input pad, and is usually 1/\fIsample_rate\fR. yading@10: .IP "\fBpts_time\fR" 4 yading@10: .IX Item "pts_time" yading@10: presentation timestamp of the input frame in seconds yading@10: .IP "\fBpos\fR" 4 yading@10: .IX Item "pos" yading@10: position of the frame in the input stream, \-1 if this information in yading@10: unavailable and/or meaningless (for example in case of synthetic audio) yading@10: .IP "\fBfmt\fR" 4 yading@10: .IX Item "fmt" yading@10: sample format yading@10: .IP "\fBchlayout\fR" 4 yading@10: .IX Item "chlayout" yading@10: channel layout yading@10: .IP "\fBrate\fR" 4 yading@10: .IX Item "rate" yading@10: sample rate for the audio frame yading@10: .IP "\fBnb_samples\fR" 4 yading@10: .IX Item "nb_samples" yading@10: number of samples (per channel) in the frame yading@10: .IP "\fBchecksum\fR" 4 yading@10: .IX Item "checksum" yading@10: Adler\-32 checksum (printed in hexadecimal) of the audio data. For planar audio yading@10: the data is treated as if all the planes were concatenated. yading@10: .IP "\fBplane_checksums\fR" 4 yading@10: .IX Item "plane_checksums" yading@10: A list of Adler\-32 checksums for each data plane. yading@10: .SS "astreamsync" yading@10: .IX Subsection "astreamsync" yading@10: Forward two audio streams and control the order the buffers are forwarded. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBexpr, e\fR" 4 yading@10: .IX Item "expr, e" yading@10: Set the expression deciding which stream should be yading@10: forwarded next: if the result is negative, the first stream is forwarded; if yading@10: the result is positive or zero, the second stream is forwarded. It can use yading@10: the following variables: yading@10: .RS 4 yading@10: .IP "\fIb1 b2\fR" 4 yading@10: .IX Item "b1 b2" yading@10: number of buffers forwarded so far on each stream yading@10: .IP "\fIs1 s2\fR" 4 yading@10: .IX Item "s1 s2" yading@10: number of samples forwarded so far on each stream yading@10: .IP "\fIt1 t2\fR" 4 yading@10: .IX Item "t1 t2" yading@10: current timestamp of each stream yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: The default value is \f(CW\*(C`t1\-t2\*(C'\fR, which means to always forward the stream yading@10: that has a smaller timestamp. yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .PP yading@10: Stress-test \f(CW\*(C`amerge\*(C'\fR by randomly sending buffers on the wrong yading@10: input, while avoiding too much of a desynchronization: yading@10: .PP yading@10: .Vb 3 yading@10: \& amovie=file.ogg [a] ; amovie=file.mp3 [b] ; yading@10: \& [a] [b] astreamsync=(2*random(1))\-1+tanh(5*(t1\-t2)) [a2] [b2] ; yading@10: \& [a2] [b2] amerge yading@10: .Ve yading@10: .SS "atempo" yading@10: .IX Subsection "atempo" yading@10: Adjust audio tempo. yading@10: .PP yading@10: The filter accepts exactly one parameter, the audio tempo. If not yading@10: specified then the filter will assume nominal 1.0 tempo. Tempo must yading@10: be in the [0.5, 2.0] range. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Slow down audio to 80% tempo: yading@10: .Sp yading@10: .Vb 1 yading@10: \& atempo=0.8 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: To speed up audio to 125% tempo: yading@10: .Sp yading@10: .Vb 1 yading@10: \& atempo=1.25 yading@10: .Ve yading@10: .SS "earwax" yading@10: .IX Subsection "earwax" yading@10: Make audio easier to listen to on headphones. yading@10: .PP yading@10: This filter adds `cues' to 44.1kHz stereo (i.e. audio \s-1CD\s0 format) audio yading@10: so that when listened to on headphones the stereo image is moved from yading@10: inside your head (standard for headphones) to outside and in front of yading@10: the listener (standard for speakers). yading@10: .PP yading@10: Ported from SoX. yading@10: .SS "pan" yading@10: .IX Subsection "pan" yading@10: Mix channels with specific gain levels. The filter accepts the output yading@10: channel layout followed by a set of channels definitions. yading@10: .PP yading@10: This filter is also designed to remap efficiently the channels of an audio yading@10: stream. yading@10: .PP yading@10: The filter accepts parameters of the form: yading@10: "\fIl\fR:\fIoutdef\fR:\fIoutdef\fR:..." yading@10: .IP "\fBl\fR" 4 yading@10: .IX Item "l" yading@10: output channel layout or number of channels yading@10: .IP "\fBoutdef\fR" 4 yading@10: .IX Item "outdef" yading@10: output channel specification, of the form: yading@10: "\fIout_name\fR=[\fIgain\fR*]\fIin_name\fR[+[\fIgain\fR*]\fIin_name\fR...]" yading@10: .IP "\fBout_name\fR" 4 yading@10: .IX Item "out_name" yading@10: output channel to define, either a channel name (\s-1FL\s0, \s-1FR\s0, etc.) or a channel yading@10: number (c0, c1, etc.) yading@10: .IP "\fBgain\fR" 4 yading@10: .IX Item "gain" yading@10: multiplicative coefficient for the channel, 1 leaving the volume unchanged yading@10: .IP "\fBin_name\fR" 4 yading@10: .IX Item "in_name" yading@10: input channel to use, see out_name for details; it is not possible to mix yading@10: named and numbered input channels yading@10: .PP yading@10: If the `=' in a channel specification is replaced by `<', then the gains for yading@10: that specification will be renormalized so that the total is 1, thus yading@10: avoiding clipping noise. yading@10: .PP yading@10: \fIMixing examples\fR yading@10: .IX Subsection "Mixing examples" yading@10: .PP yading@10: For example, if you want to down-mix from stereo to mono, but with a bigger yading@10: factor for the left channel: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan=1:c0=0.9*c0+0.1*c1 yading@10: .Ve yading@10: .PP yading@10: A customized down-mix to stereo that works automatically for 3\-, 4\-, 5\- and yading@10: 7\-channels surround: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan=stereo: FL < FL + 0.5*FC + 0.6*BL + 0.6*SL : FR < FR + 0.5*FC + 0.6*BR + 0.6*SR yading@10: .Ve yading@10: .PP yading@10: Note that \fBffmpeg\fR integrates a default down-mix (and up-mix) system yading@10: that should be preferred (see \*(L"\-ac\*(R" option) unless you have very specific yading@10: needs. yading@10: .PP yading@10: \fIRemapping examples\fR yading@10: .IX Subsection "Remapping examples" yading@10: .PP yading@10: The channel remapping will be effective if, and only if: yading@10: .IP "*" 4 yading@10: .IX Item "*" yading@10: .PD 0 yading@10: .IP "*" 4 yading@10: .IX Item "*" yading@10: .PD yading@10: .PP yading@10: If all these conditions are satisfied, the filter will notify the user (\*(L"Pure yading@10: channel mapping detected\*(R"), and use an optimized and lossless method to do the yading@10: remapping. yading@10: .PP yading@10: For example, if you have a 5.1 source and want a stereo audio stream by yading@10: dropping the extra channels: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan="stereo: c0=FL : c1=FR" yading@10: .Ve yading@10: .PP yading@10: Given the same source, you can also switch front left and front right channels yading@10: and keep the input channel layout: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan="5.1: c0=c1 : c1=c0 : c2=c2 : c3=c3 : c4=c4 : c5=c5" yading@10: .Ve yading@10: .PP yading@10: If the input is a stereo audio stream, you can mute the front left channel (and yading@10: still keep the stereo channel layout) with: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan="stereo:c1=c1" yading@10: .Ve yading@10: .PP yading@10: Still with a stereo audio stream input, you can copy the right channel in both yading@10: front left and right: yading@10: .PP yading@10: .Vb 1 yading@10: \& pan="stereo: c0=FR : c1=FR" yading@10: .Ve yading@10: .SS "silencedetect" yading@10: .IX Subsection "silencedetect" yading@10: Detect silence in an audio stream. yading@10: .PP yading@10: This filter logs a message when it detects that the input audio volume is less yading@10: or equal to a noise tolerance value for a duration greater or equal to the yading@10: minimum detected noise duration. yading@10: .PP yading@10: The printed times and duration are expressed in seconds. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Set silence duration until notification (default is 2 seconds). yading@10: .IP "\fBnoise, n\fR" 4 yading@10: .IX Item "noise, n" yading@10: Set noise tolerance. Can be specified in dB (in case \*(L"dB\*(R" is appended to the yading@10: specified value) or amplitude ratio. Default is \-60dB, or 0.001. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Detect 5 seconds of silence with \-50dB noise tolerance: yading@10: .Sp yading@10: .Vb 1 yading@10: \& silencedetect=n=\-50dB:d=5 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Complete example with \fBffmpeg\fR to detect silence with 0.0001 noise yading@10: tolerance in \fIsilence.mp3\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i silence.mp3 \-af silencedetect=noise=0.0001 \-f null \- yading@10: .Ve yading@10: .SS "asyncts" yading@10: .IX Subsection "asyncts" yading@10: Synchronize audio data with timestamps by squeezing/stretching it and/or yading@10: dropping samples/adding silence when needed. yading@10: .PP yading@10: This filter is not built by default, please use aresample to do squeezing/stretching. yading@10: .PP yading@10: The filter accepts the following named parameters: yading@10: .IP "\fBcompensate\fR" 4 yading@10: .IX Item "compensate" yading@10: Enable stretching/squeezing the data to make it match the timestamps. Disabled yading@10: by default. When disabled, time gaps are covered with silence. yading@10: .IP "\fBmin_delta\fR" 4 yading@10: .IX Item "min_delta" yading@10: Minimum difference between timestamps and audio data (in seconds) to trigger yading@10: adding/dropping samples. Default value is 0.1. If you get non-perfect sync with yading@10: this filter, try setting this parameter to 0. yading@10: .IP "\fBmax_comp\fR" 4 yading@10: .IX Item "max_comp" yading@10: Maximum compensation in samples per second. Relevant only with compensate=1. yading@10: Default value 500. yading@10: .IP "\fBfirst_pts\fR" 4 yading@10: .IX Item "first_pts" yading@10: Assume the first pts should be this value. The time base is 1 / sample rate. yading@10: This allows for padding/trimming at the start of stream. By default, no yading@10: assumption is made about the first frame's expected pts, so no padding or yading@10: trimming is done. For example, this could be set to 0 to pad the beginning with yading@10: silence if an audio stream starts after the video stream or to trim any samples yading@10: with a negative pts due to encoder delay. yading@10: .SS "channelsplit" yading@10: .IX Subsection "channelsplit" yading@10: Split each channel in input audio stream into a separate output stream. yading@10: .PP yading@10: This filter accepts the following named parameters: yading@10: .IP "\fBchannel_layout\fR" 4 yading@10: .IX Item "channel_layout" yading@10: Channel layout of the input stream. Default is \*(L"stereo\*(R". yading@10: .PP yading@10: For example, assuming a stereo input \s-1MP3\s0 file yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.mp3 \-filter_complex channelsplit out.mkv yading@10: .Ve yading@10: .PP yading@10: will create an output Matroska file with two audio streams, one containing only yading@10: the left channel and the other the right channel. yading@10: .PP yading@10: To split a 5.1 \s-1WAV\s0 file into per-channel files yading@10: .PP yading@10: .Vb 5 yading@10: \& ffmpeg \-i in.wav \-filter_complex yading@10: \& \*(Aqchannelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]\*(Aq yading@10: \& \-map \*(Aq[FL]\*(Aq front_left.wav \-map \*(Aq[FR]\*(Aq front_right.wav \-map \*(Aq[FC]\*(Aq yading@10: \& front_center.wav \-map \*(Aq[LFE]\*(Aq lfe.wav \-map \*(Aq[SL]\*(Aq side_left.wav \-map \*(Aq[SR]\*(Aq yading@10: \& side_right.wav yading@10: .Ve yading@10: .SS "channelmap" yading@10: .IX Subsection "channelmap" yading@10: Remap input channels to new locations. yading@10: .PP yading@10: This filter accepts the following named parameters: yading@10: .IP "\fBchannel_layout\fR" 4 yading@10: .IX Item "channel_layout" yading@10: Channel layout of the output stream. yading@10: .IP "\fBmap\fR" 4 yading@10: .IX Item "map" yading@10: Map channels from input to output. The argument is a '|'\-separated list of yading@10: mappings, each in the \f(CW\*(C`\f(CIin_channel\f(CW\-\f(CIout_channel\f(CW\*(C'\fR or yading@10: \&\fIin_channel\fR form. \fIin_channel\fR can be either the name of the input yading@10: channel (e.g. \s-1FL\s0 for front left) or its index in the input channel layout. yading@10: \&\fIout_channel\fR is the name of the output channel or its index in the output yading@10: channel layout. If \fIout_channel\fR is not given then it is implicitly an yading@10: index, starting with zero and increasing by one for each mapping. yading@10: .PP yading@10: If no mapping is present, the filter will implicitly map input channels to yading@10: output channels preserving index. yading@10: .PP yading@10: For example, assuming a 5.1+downmix input \s-1MOV\s0 file yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.mov \-filter \*(Aqchannelmap=map=DL\-FL|DR\-FR\*(Aq out.wav yading@10: .Ve yading@10: .PP yading@10: will create an output \s-1WAV\s0 file tagged as stereo from the downmix channels of yading@10: the input. yading@10: .PP yading@10: To fix a 5.1 \s-1WAV\s0 improperly encoded in \s-1AAC\s0's native channel order yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.wav \-filter \*(Aqchannelmap=1|2|0|5|3|4:channel_layout=5.1\*(Aq out.wav yading@10: .Ve yading@10: .SS "join" yading@10: .IX Subsection "join" yading@10: Join multiple input streams into one multi-channel stream. yading@10: .PP yading@10: The filter accepts the following named parameters: yading@10: .IP "\fBinputs\fR" 4 yading@10: .IX Item "inputs" yading@10: Number of input streams. Defaults to 2. yading@10: .IP "\fBchannel_layout\fR" 4 yading@10: .IX Item "channel_layout" yading@10: Desired output channel layout. Defaults to stereo. yading@10: .IP "\fBmap\fR" 4 yading@10: .IX Item "map" yading@10: Map channels from inputs to output. The argument is a '|'\-separated list of yading@10: mappings, each in the \f(CW\*(C`\f(CIinput_idx\f(CW.\f(CIin_channel\f(CW\-\f(CIout_channel\f(CW\*(C'\fR yading@10: form. \fIinput_idx\fR is the 0\-based index of the input stream. \fIin_channel\fR yading@10: can be either the name of the input channel (e.g. \s-1FL\s0 for front left) or its yading@10: index in the specified input stream. \fIout_channel\fR is the name of the output yading@10: channel. yading@10: .PP yading@10: The filter will attempt to guess the mappings when those are not specified yading@10: explicitly. It does so by first trying to find an unused matching input channel yading@10: and if that fails it picks the first unused input channel. yading@10: .PP yading@10: E.g. to join 3 inputs (with properly set channel layouts) yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i INPUT1 \-i INPUT2 \-i INPUT3 \-filter_complex join=inputs=3 OUTPUT yading@10: .Ve yading@10: .PP yading@10: To build a 5.1 output from 6 single-channel streams: yading@10: .PP yading@10: .Vb 3 yading@10: \& ffmpeg \-i fl \-i fr \-i fc \-i sl \-i sr \-i lfe \-filter_complex yading@10: \& \*(Aqjoin=inputs=6:channel_layout=5.1:map=0.0\-FL|1.0\-FR|2.0\-FC|3.0\-SL|4.0\-SR|5.0\-LFE\*(Aq yading@10: \& out yading@10: .Ve yading@10: .SS "resample" yading@10: .IX Subsection "resample" yading@10: Convert the audio sample format, sample rate and channel layout. This filter is yading@10: not meant to be used directly. yading@10: .SS "volume" yading@10: .IX Subsection "volume" yading@10: Adjust the input audio volume. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBvolume\fR" 4 yading@10: .IX Item "volume" yading@10: Expresses how the audio volume will be increased or decreased. yading@10: .Sp yading@10: Output values are clipped to the maximum value. yading@10: .Sp yading@10: The output audio volume is given by the relation: yading@10: .Sp yading@10: .Vb 1 yading@10: \& = * yading@10: .Ve yading@10: .Sp yading@10: Default value for \fIvolume\fR is 1.0. yading@10: .IP "\fBprecision\fR" 4 yading@10: .IX Item "precision" yading@10: Set the mathematical precision. yading@10: .Sp yading@10: This determines which input sample formats will be allowed, which affects the yading@10: precision of the volume scaling. yading@10: .RS 4 yading@10: .IP "\fBfixed\fR" 4 yading@10: .IX Item "fixed" yading@10: 8\-bit fixed-point; limits input sample format to U8, S16, and S32. yading@10: .IP "\fBfloat\fR" 4 yading@10: .IX Item "float" yading@10: 32\-bit floating-point; limits input sample format to \s-1FLT\s0. (default) yading@10: .IP "\fBdouble\fR" 4 yading@10: .IX Item "double" yading@10: 64\-bit floating-point; limits input sample format to \s-1DBL\s0. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Halve the input audio volume: yading@10: .Sp yading@10: .Vb 3 yading@10: \& volume=volume=0.5 yading@10: \& volume=volume=1/2 yading@10: \& volume=volume=\-6.0206dB yading@10: .Ve yading@10: .Sp yading@10: In all the above example the named key for \fBvolume\fR can be yading@10: omitted, for example like in: yading@10: .Sp yading@10: .Vb 1 yading@10: \& volume=0.5 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Increase input audio power by 6 decibels using fixed-point precision: yading@10: .Sp yading@10: .Vb 1 yading@10: \& volume=volume=6dB:precision=fixed yading@10: .Ve yading@10: .SS "volumedetect" yading@10: .IX Subsection "volumedetect" yading@10: Detect the volume of the input video. yading@10: .PP yading@10: The filter has no parameters. The input is not modified. Statistics about yading@10: the volume will be printed in the log when the input stream end is reached. yading@10: .PP yading@10: In particular it will show the mean volume (root mean square), maximum yading@10: volume (on a per-sample basis), and the beginning of an histogram of the yading@10: registered volume values (from the maximum value to a cumulated 1/1000 of yading@10: the samples). yading@10: .PP yading@10: All volumes are in decibels relative to the maximum \s-1PCM\s0 value. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .PP yading@10: Here is an excerpt of the output: yading@10: .PP yading@10: .Vb 9 yading@10: \& [Parsed_volumedetect_0 0xa23120] mean_volume: \-27 dB yading@10: \& [Parsed_volumedetect_0 0xa23120] max_volume: \-4 dB yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_4db: 6 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_5db: 62 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_6db: 286 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_7db: 1042 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_8db: 2551 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_9db: 4609 yading@10: \& [Parsed_volumedetect_0 0xa23120] histogram_10db: 8409 yading@10: .Ve yading@10: .PP yading@10: It means that: yading@10: .IP "\(bu" 4 yading@10: The mean square energy is approximately \-27 dB, or 10^\-2.7. yading@10: .IP "\(bu" 4 yading@10: The largest sample is at \-4 dB, or more precisely between \-4 dB and \-5 dB. yading@10: .IP "\(bu" 4 yading@10: There are 6 samples at \-4 dB, 62 at \-5 dB, 286 at \-6 dB, etc. yading@10: .PP yading@10: In other words, raising the volume by +4 dB does not cause any clipping, yading@10: raising it by +5 dB causes clipping for 6 samples, etc. yading@10: .SH "AUDIO SOURCES" yading@10: .IX Header "AUDIO SOURCES" yading@10: Below is a description of the currently available audio sources. yading@10: .SS "abuffer" yading@10: .IX Subsection "abuffer" yading@10: Buffer audio frames, and make them available to the filter chain. yading@10: .PP yading@10: This source is mainly intended for a programmatic use, in particular yading@10: through the interface defined in \fIlibavfilter/asrc_abuffer.h\fR. yading@10: .PP yading@10: It accepts the following named parameters: yading@10: .IP "\fBtime_base\fR" 4 yading@10: .IX Item "time_base" yading@10: Timebase which will be used for timestamps of submitted frames. It must be yading@10: either a floating-point number or in \fInumerator\fR/\fIdenominator\fR form. yading@10: .IP "\fBsample_rate\fR" 4 yading@10: .IX Item "sample_rate" yading@10: The sample rate of the incoming audio buffers. yading@10: .IP "\fBsample_fmt\fR" 4 yading@10: .IX Item "sample_fmt" yading@10: The sample format of the incoming audio buffers. yading@10: Either a sample format name or its corresponging integer representation from yading@10: the enum AVSampleFormat in \fIlibavutil/samplefmt.h\fR yading@10: .IP "\fBchannel_layout\fR" 4 yading@10: .IX Item "channel_layout" yading@10: The channel layout of the incoming audio buffers. yading@10: Either a channel layout name from channel_layout_map in yading@10: \&\fIlibavutil/channel_layout.c\fR or its corresponding integer representation yading@10: from the AV_CH_LAYOUT_* macros in \fIlibavutil/channel_layout.h\fR yading@10: .IP "\fBchannels\fR" 4 yading@10: .IX Item "channels" yading@10: The number of channels of the incoming audio buffers. yading@10: If both \fIchannels\fR and \fIchannel_layout\fR are specified, then they yading@10: must be consistent. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .PP yading@10: .Vb 1 yading@10: \& abuffer=sample_rate=44100:sample_fmt=s16p:channel_layout=stereo yading@10: .Ve yading@10: .PP yading@10: will instruct the source to accept planar 16bit signed stereo at 44100Hz. yading@10: Since the sample format with name \*(L"s16p\*(R" corresponds to the number yading@10: 6 and the \*(L"stereo\*(R" channel layout corresponds to the value 0x3, this is yading@10: equivalent to: yading@10: .PP yading@10: .Vb 1 yading@10: \& abuffer=sample_rate=44100:sample_fmt=6:channel_layout=0x3 yading@10: .Ve yading@10: .SS "aevalsrc" yading@10: .IX Subsection "aevalsrc" yading@10: Generate an audio signal specified by an expression. yading@10: .PP yading@10: This source accepts in input one or more expressions (one for each yading@10: channel), which are evaluated and used to generate a corresponding yading@10: audio signal. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBexprs\fR" 4 yading@10: .IX Item "exprs" yading@10: Set the '|'\-separated expressions list for each separate channel. In case the yading@10: \&\fBchannel_layout\fR option is not specified, the selected channel layout yading@10: depends on the number of provided expressions. yading@10: .IP "\fBchannel_layout, c\fR" 4 yading@10: .IX Item "channel_layout, c" yading@10: Set the channel layout. The number of channels in the specified layout yading@10: must be equal to the number of specified expressions. yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Set the minimum duration of the sourced audio. See the function yading@10: \&\f(CW\*(C`av_parse_time()\*(C'\fR for the accepted format. yading@10: Note that the resulting duration may be greater than the specified yading@10: duration, as the generated audio is always cut at the end of a yading@10: complete frame. yading@10: .Sp yading@10: If not specified, or the expressed duration is negative, the audio is yading@10: supposed to be generated forever. yading@10: .IP "\fBnb_samples, n\fR" 4 yading@10: .IX Item "nb_samples, n" yading@10: Set the number of samples per channel per each output frame, yading@10: default to 1024. yading@10: .IP "\fBsample_rate, s\fR" 4 yading@10: .IX Item "sample_rate, s" yading@10: Specify the sample rate, default to 44100. yading@10: .PP yading@10: Each expression in \fIexprs\fR can contain the following constants: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: number of the evaluated sample, starting from 0 yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: time of the evaluated sample expressed in seconds, starting from 0 yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: sample rate yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Generate silence: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc=0 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a sin signal with frequency of 440 Hz, set sample rate to yading@10: 8000 Hz: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc="sin(440*2*PI*t):s=8000" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a two channels signal, specify the channel layout (Front yading@10: Center + Back Center) explicitly: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc="sin(420*2*PI*t)|cos(430*2*PI*t):c=FC|BC" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate white noise: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc="\-2+random(0)" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate an amplitude modulated signal: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc="sin(10*2*PI*t)*sin(880*2*PI*t)" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate 2.5 Hz binaural beats on a 360 Hz carrier: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc="0.1*sin(2*PI*(360\-2.5/2)*t) | 0.1*sin(2*PI*(360+2.5/2)*t)" yading@10: .Ve yading@10: .SS "anullsrc" yading@10: .IX Subsection "anullsrc" yading@10: Null audio source, return unprocessed audio frames. It is mainly useful yading@10: as a template and to be employed in analysis / debugging tools, or as yading@10: the source for filters which ignore the input data (for example the sox yading@10: synth filter). yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBchannel_layout, cl\fR" 4 yading@10: .IX Item "channel_layout, cl" yading@10: Specify the channel layout, and can be either an integer or a string yading@10: representing a channel layout. The default value of \fIchannel_layout\fR yading@10: is \*(L"stereo\*(R". yading@10: .Sp yading@10: Check the channel_layout_map definition in yading@10: \&\fIlibavutil/channel_layout.c\fR for the mapping between strings and yading@10: channel layout values. yading@10: .IP "\fBsample_rate, r\fR" 4 yading@10: .IX Item "sample_rate, r" yading@10: Specify the sample rate, and defaults to 44100. yading@10: .IP "\fBnb_samples, n\fR" 4 yading@10: .IX Item "nb_samples, n" yading@10: Set the number of samples per requested frames. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Set the sample rate to 48000 Hz and the channel layout to \s-1AV_CH_LAYOUT_MONO\s0. yading@10: .Sp yading@10: .Vb 1 yading@10: \& anullsrc=r=48000:cl=4 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Do the same operation with a more obvious syntax: yading@10: .Sp yading@10: .Vb 1 yading@10: \& anullsrc=r=48000:cl=mono yading@10: .Ve yading@10: .SS "abuffer" yading@10: .IX Subsection "abuffer" yading@10: Buffer audio frames, and make them available to the filter chain. yading@10: .PP yading@10: This source is not intended to be part of user-supplied graph descriptions but yading@10: for insertion by calling programs through the interface defined in yading@10: \&\fIlibavfilter/buffersrc.h\fR. yading@10: .PP yading@10: It accepts the following named parameters: yading@10: .IP "\fBtime_base\fR" 4 yading@10: .IX Item "time_base" yading@10: Timebase which will be used for timestamps of submitted frames. It must be yading@10: either a floating-point number or in \fInumerator\fR/\fIdenominator\fR form. yading@10: .IP "\fBsample_rate\fR" 4 yading@10: .IX Item "sample_rate" yading@10: Audio sample rate. yading@10: .IP "\fBsample_fmt\fR" 4 yading@10: .IX Item "sample_fmt" yading@10: Name of the sample format, as returned by \f(CW\*(C`av_get_sample_fmt_name()\*(C'\fR. yading@10: .IP "\fBchannel_layout\fR" 4 yading@10: .IX Item "channel_layout" yading@10: Channel layout of the audio data, in the form that can be accepted by yading@10: \&\f(CW\*(C`av_get_channel_layout()\*(C'\fR. yading@10: .PP yading@10: All the parameters need to be explicitly defined. yading@10: .SS "flite" yading@10: .IX Subsection "flite" yading@10: Synthesize a voice utterance using the libflite library. yading@10: .PP yading@10: To enable compilation of this filter you need to configure FFmpeg with yading@10: \&\f(CW\*(C`\-\-enable\-libflite\*(C'\fR. yading@10: .PP yading@10: Note that the flite library is not thread-safe. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBlist_voices\fR" 4 yading@10: .IX Item "list_voices" yading@10: If set to 1, list the names of the available voices and exit yading@10: immediately. Default value is 0. yading@10: .IP "\fBnb_samples, n\fR" 4 yading@10: .IX Item "nb_samples, n" yading@10: Set the maximum number of samples per frame. Default value is 512. yading@10: .IP "\fBtextfile\fR" 4 yading@10: .IX Item "textfile" yading@10: Set the filename containing the text to speak. yading@10: .IP "\fBtext\fR" 4 yading@10: .IX Item "text" yading@10: Set the text to speak. yading@10: .IP "\fBvoice, v\fR" 4 yading@10: .IX Item "voice, v" yading@10: Set the voice to use for the speech synthesis. Default value is yading@10: \&\f(CW\*(C`kal\*(C'\fR. See also the \fIlist_voices\fR option. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Read from file \fIspeech.txt\fR, and synthetize the text using the yading@10: standard flite voice: yading@10: .Sp yading@10: .Vb 1 yading@10: \& flite=textfile=speech.txt yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Read the specified text selecting the \f(CW\*(C`slt\*(C'\fR voice: yading@10: .Sp yading@10: .Vb 1 yading@10: \& flite=text=\*(AqSo fare thee well, poor devil of a Sub\-Sub, whose commentator I am\*(Aq:voice=slt yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Input text to ffmpeg: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-f lavfi \-i flite=text=\*(AqSo fare thee well, poor devil of a Sub\-Sub, whose commentator I am\*(Aq:voice=slt yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Make \fIffplay\fR speak the specified text, using \f(CW\*(C`flite\*(C'\fR and yading@10: the \f(CW\*(C`lavfi\*(C'\fR device: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay \-f lavfi flite=text=\*(AqNo more be grieved for which that thou hast done.\*(Aq yading@10: .Ve yading@10: .PP yading@10: For more information about libflite, check: yading@10: <\fBhttp://www.speech.cs.cmu.edu/flite/\fR> yading@10: .SS "sine" yading@10: .IX Subsection "sine" yading@10: Generate an audio signal made of a sine wave with amplitude 1/8. yading@10: .PP yading@10: The audio signal is bit-exact. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfrequency, f\fR" 4 yading@10: .IX Item "frequency, f" yading@10: Set the carrier frequency. Default is 440 Hz. yading@10: .IP "\fBbeep_factor, b\fR" 4 yading@10: .IX Item "beep_factor, b" yading@10: Enable a periodic beep every second with frequency \fIbeep_factor\fR times yading@10: the carrier frequency. Default is 0, meaning the beep is disabled. yading@10: .IP "\fBsample_rate, s\fR" 4 yading@10: .IX Item "sample_rate, s" yading@10: Specify the sample rate, default is 44100. yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Specify the duration of the generated audio stream. yading@10: .IP "\fBsamples_per_frame\fR" 4 yading@10: .IX Item "samples_per_frame" yading@10: Set the number of samples per output frame, default is 1024. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Generate a simple 440 Hz sine wave: yading@10: .Sp yading@10: .Vb 1 yading@10: \& sine yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a 220 Hz sine wave with a 880 Hz beep each second, for 5 seconds: yading@10: .Sp yading@10: .Vb 3 yading@10: \& sine=220:4:d=5 yading@10: \& sine=f=220:b=4:d=5 yading@10: \& sine=frequency=220:beep_factor=4:duration=5 yading@10: .Ve yading@10: .SH "AUDIO SINKS" yading@10: .IX Header "AUDIO SINKS" yading@10: Below is a description of the currently available audio sinks. yading@10: .SS "abuffersink" yading@10: .IX Subsection "abuffersink" yading@10: Buffer audio frames, and make them available to the end of filter chain. yading@10: .PP yading@10: This sink is mainly intended for programmatic use, in particular yading@10: through the interface defined in \fIlibavfilter/buffersink.h\fR yading@10: or the options system. yading@10: .PP yading@10: It accepts a pointer to an AVABufferSinkContext structure, which yading@10: defines the incoming buffers' formats, to be passed as the opaque yading@10: parameter to \f(CW\*(C`avfilter_init_filter\*(C'\fR for initialization. yading@10: .SS "anullsink" yading@10: .IX Subsection "anullsink" yading@10: Null audio sink, do absolutely nothing with the input audio. It is yading@10: mainly useful as a template and to be employed in analysis / debugging yading@10: tools. yading@10: .SH "VIDEO FILTERS" yading@10: .IX Header "VIDEO FILTERS" yading@10: When you configure your FFmpeg build, you can disable any of the yading@10: existing filters using \f(CW\*(C`\-\-disable\-filters\*(C'\fR. yading@10: The configure output will show the video filters included in your yading@10: build. yading@10: .PP yading@10: Below is a description of the currently available video filters. yading@10: .SS "alphaextract" yading@10: .IX Subsection "alphaextract" yading@10: Extract the alpha component from the input as a grayscale video. This yading@10: is especially useful with the \fIalphamerge\fR filter. yading@10: .SS "alphamerge" yading@10: .IX Subsection "alphamerge" yading@10: Add or replace the alpha component of the primary input with the yading@10: grayscale value of a second input. This is intended for use with yading@10: \&\fIalphaextract\fR to allow the transmission or storage of frame yading@10: sequences that have alpha in a format that doesn't support an alpha yading@10: channel. yading@10: .PP yading@10: For example, to reconstruct full frames from a normal YUV-encoded video yading@10: and a separate video created with \fIalphaextract\fR, you might use: yading@10: .PP yading@10: .Vb 1 yading@10: \& movie=in_alpha.mkv [alpha]; [in][alpha] alphamerge [out] yading@10: .Ve yading@10: .PP yading@10: Since this filter is designed for reconstruction, it operates on frame yading@10: sequences without considering timestamps, and terminates when either yading@10: input reaches end of stream. This will cause problems if your encoding yading@10: pipeline drops frames. If you're trying to apply an image as an yading@10: overlay to a video stream, consider the \fIoverlay\fR filter instead. yading@10: .SS "ass" yading@10: .IX Subsection "ass" yading@10: Same as the subtitles filter, except that it doesn't require libavcodec yading@10: and libavformat to work. On the other hand, it is limited to \s-1ASS\s0 (Advanced yading@10: Substation Alpha) subtitles files. yading@10: .SS "bbox" yading@10: .IX Subsection "bbox" yading@10: Compute the bounding box for the non-black pixels in the input frame yading@10: luminance plane. yading@10: .PP yading@10: This filter computes the bounding box containing all the pixels with a yading@10: luminance value greater than the minimum allowed value. yading@10: The parameters describing the bounding box are printed on the filter yading@10: log. yading@10: .SS "blackdetect" yading@10: .IX Subsection "blackdetect" yading@10: Detect video intervals that are (almost) completely black. Can be yading@10: useful to detect chapter transitions, commercials, or invalid yading@10: recordings. Output lines contains the time for the start, end and yading@10: duration of the detected black interval expressed in seconds. yading@10: .PP yading@10: In order to display the output lines, you need to set the loglevel at yading@10: least to the \s-1AV_LOG_INFO\s0 value. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBblack_min_duration, d\fR" 4 yading@10: .IX Item "black_min_duration, d" yading@10: Set the minimum detected black duration expressed in seconds. It must yading@10: be a non-negative floating point number. yading@10: .Sp yading@10: Default value is 2.0. yading@10: .IP "\fBpicture_black_ratio_th, pic_th\fR" 4 yading@10: .IX Item "picture_black_ratio_th, pic_th" yading@10: Set the threshold for considering a picture \*(L"black\*(R". yading@10: Express the minimum value for the ratio: yading@10: .Sp yading@10: .Vb 1 yading@10: \& / yading@10: .Ve yading@10: .Sp yading@10: for which a picture is considered black. yading@10: Default value is 0.98. yading@10: .IP "\fBpixel_black_th, pix_th\fR" 4 yading@10: .IX Item "pixel_black_th, pix_th" yading@10: Set the threshold for considering a pixel \*(L"black\*(R". yading@10: .Sp yading@10: The threshold expresses the maximum pixel luminance value for which a yading@10: pixel is considered \*(L"black\*(R". The provided value is scaled according to yading@10: the following equation: yading@10: .Sp yading@10: .Vb 1 yading@10: \& = + * yading@10: .Ve yading@10: .Sp yading@10: \&\fIluminance_range_size\fR and \fIluminance_minimum_value\fR depend on yading@10: the input video format, the range is [0\-255] for \s-1YUV\s0 full-range yading@10: formats and [16\-235] for \s-1YUV\s0 non full-range formats. yading@10: .Sp yading@10: Default value is 0.10. yading@10: .PP yading@10: The following example sets the maximum pixel threshold to the minimum yading@10: value, and detects only black intervals of 2 or more seconds: yading@10: .PP yading@10: .Vb 1 yading@10: \& blackdetect=d=2:pix_th=0.00 yading@10: .Ve yading@10: .SS "blackframe" yading@10: .IX Subsection "blackframe" yading@10: Detect frames that are (almost) completely black. Can be useful to yading@10: detect chapter transitions or commercials. Output lines consist of yading@10: the frame number of the detected frame, the percentage of blackness, yading@10: the position in the file if known or \-1 and the timestamp in seconds. yading@10: .PP yading@10: In order to display the output lines, you need to set the loglevel at yading@10: least to the \s-1AV_LOG_INFO\s0 value. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBamount\fR" 4 yading@10: .IX Item "amount" yading@10: Set the percentage of the pixels that have to be below the threshold, defaults yading@10: to \f(CW98\fR. yading@10: .IP "\fBthreshold, thresh\fR" 4 yading@10: .IX Item "threshold, thresh" yading@10: Set the threshold below which a pixel value is considered black, defaults to yading@10: \&\f(CW32\fR. yading@10: .SS "blend" yading@10: .IX Subsection "blend" yading@10: Blend two video frames into each other. yading@10: .PP yading@10: It takes two input streams and outputs one stream, the first input is the yading@10: \&\*(L"top\*(R" layer and second input is \*(L"bottom\*(R" layer. yading@10: Output terminates when shortest input terminates. yading@10: .PP yading@10: A description of the accepted options follows. yading@10: .IP "\fBc0_mode\fR" 4 yading@10: .IX Item "c0_mode" yading@10: .PD 0 yading@10: .IP "\fBc1_mode\fR" 4 yading@10: .IX Item "c1_mode" yading@10: .IP "\fBc2_mode\fR" 4 yading@10: .IX Item "c2_mode" yading@10: .IP "\fBc3_mode\fR" 4 yading@10: .IX Item "c3_mode" yading@10: .IP "\fBall_mode\fR" 4 yading@10: .IX Item "all_mode" yading@10: .PD yading@10: Set blend mode for specific pixel component or all pixel components in case yading@10: of \fIall_mode\fR. Default value is \f(CW\*(C`normal\*(C'\fR. yading@10: .Sp yading@10: Available values for component modes are: yading@10: .RS 4 yading@10: .IP "\fBaddition\fR" 4 yading@10: .IX Item "addition" yading@10: .PD 0 yading@10: .IP "\fBand\fR" 4 yading@10: .IX Item "and" yading@10: .IP "\fBaverage\fR" 4 yading@10: .IX Item "average" yading@10: .IP "\fBburn\fR" 4 yading@10: .IX Item "burn" yading@10: .IP "\fBdarken\fR" 4 yading@10: .IX Item "darken" yading@10: .IP "\fBdifference\fR" 4 yading@10: .IX Item "difference" yading@10: .IP "\fBdivide\fR" 4 yading@10: .IX Item "divide" yading@10: .IP "\fBdodge\fR" 4 yading@10: .IX Item "dodge" yading@10: .IP "\fBexclusion\fR" 4 yading@10: .IX Item "exclusion" yading@10: .IP "\fBhardlight\fR" 4 yading@10: .IX Item "hardlight" yading@10: .IP "\fBlighten\fR" 4 yading@10: .IX Item "lighten" yading@10: .IP "\fBmultiply\fR" 4 yading@10: .IX Item "multiply" yading@10: .IP "\fBnegation\fR" 4 yading@10: .IX Item "negation" yading@10: .IP "\fBnormal\fR" 4 yading@10: .IX Item "normal" yading@10: .IP "\fBor\fR" 4 yading@10: .IX Item "or" yading@10: .IP "\fBoverlay\fR" 4 yading@10: .IX Item "overlay" yading@10: .IP "\fBphoenix\fR" 4 yading@10: .IX Item "phoenix" yading@10: .IP "\fBpinlight\fR" 4 yading@10: .IX Item "pinlight" yading@10: .IP "\fBreflect\fR" 4 yading@10: .IX Item "reflect" yading@10: .IP "\fBscreen\fR" 4 yading@10: .IX Item "screen" yading@10: .IP "\fBsoftlight\fR" 4 yading@10: .IX Item "softlight" yading@10: .IP "\fBsubtract\fR" 4 yading@10: .IX Item "subtract" yading@10: .IP "\fBvividlight\fR" 4 yading@10: .IX Item "vividlight" yading@10: .IP "\fBxor\fR" 4 yading@10: .IX Item "xor" yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBc0_opacity\fR" 4 yading@10: .IX Item "c0_opacity" yading@10: .IP "\fBc1_opacity\fR" 4 yading@10: .IX Item "c1_opacity" yading@10: .IP "\fBc2_opacity\fR" 4 yading@10: .IX Item "c2_opacity" yading@10: .IP "\fBc3_opacity\fR" 4 yading@10: .IX Item "c3_opacity" yading@10: .IP "\fBall_opacity\fR" 4 yading@10: .IX Item "all_opacity" yading@10: .PD yading@10: Set blend opacity for specific pixel component or all pixel components in case yading@10: of \fIall_opacity\fR. Only used in combination with pixel component blend modes. yading@10: .IP "\fBc0_expr\fR" 4 yading@10: .IX Item "c0_expr" yading@10: .PD 0 yading@10: .IP "\fBc1_expr\fR" 4 yading@10: .IX Item "c1_expr" yading@10: .IP "\fBc2_expr\fR" 4 yading@10: .IX Item "c2_expr" yading@10: .IP "\fBc3_expr\fR" 4 yading@10: .IX Item "c3_expr" yading@10: .IP "\fBall_expr\fR" 4 yading@10: .IX Item "all_expr" yading@10: .PD yading@10: Set blend expression for specific pixel component or all pixel components in case yading@10: of \fIall_expr\fR. Note that related mode options will be ignored if those are set. yading@10: .Sp yading@10: The expressions can use the following variables: yading@10: .RS 4 yading@10: .IP "\fBN\fR" 4 yading@10: .IX Item "N" yading@10: The sequential number of the filtered frame, starting from \f(CW0\fR. yading@10: .IP "\fBX\fR" 4 yading@10: .IX Item "X" yading@10: .PD 0 yading@10: .IP "\fBY\fR" 4 yading@10: .IX Item "Y" yading@10: .PD yading@10: the coordinates of the current sample yading@10: .IP "\fBW\fR" 4 yading@10: .IX Item "W" yading@10: .PD 0 yading@10: .IP "\fBH\fR" 4 yading@10: .IX Item "H" yading@10: .PD yading@10: the width and height of currently filtered plane yading@10: .IP "\fB\s-1SW\s0\fR" 4 yading@10: .IX Item "SW" yading@10: .PD 0 yading@10: .IP "\fB\s-1SH\s0\fR" 4 yading@10: .IX Item "SH" yading@10: .PD yading@10: Width and height scale depending on the currently filtered plane. It is the yading@10: ratio between the corresponding luma plane number of pixels and the current yading@10: plane ones. E.g. for \s-1YUV4:2:0\s0 the values are \f(CW\*(C`1,1\*(C'\fR for the luma plane, and yading@10: \&\f(CW\*(C`0.5,0.5\*(C'\fR for chroma planes. yading@10: .IP "\fBT\fR" 4 yading@10: .IX Item "T" yading@10: Time of the current frame, expressed in seconds. yading@10: .IP "\fB\s-1TOP\s0, A\fR" 4 yading@10: .IX Item "TOP, A" yading@10: Value of pixel component at current location for first video frame (top layer). yading@10: .IP "\fB\s-1BOTTOM\s0, B\fR" 4 yading@10: .IX Item "BOTTOM, B" yading@10: Value of pixel component at current location for second video frame (bottom layer). yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply transition from bottom layer to top layer in first 10 seconds: yading@10: .Sp yading@10: .Vb 1 yading@10: \& blend=all_expr=\*(AqA*(if(gte(T,10),1,T/10))+B*(1\-(if(gte(T,10),1,T/10)))\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply 1x1 checkerboard effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& blend=all_expr=\*(Aqif(eq(mod(X,2),mod(Y,2)),A,B)\*(Aq yading@10: .Ve yading@10: .SS "boxblur" yading@10: .IX Subsection "boxblur" yading@10: Apply boxblur algorithm to the input video. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBluma_radius, lr\fR" 4 yading@10: .IX Item "luma_radius, lr" yading@10: .PD 0 yading@10: .IP "\fBluma_power, lp\fR" 4 yading@10: .IX Item "luma_power, lp" yading@10: .IP "\fBchroma_radius, cr\fR" 4 yading@10: .IX Item "chroma_radius, cr" yading@10: .IP "\fBchroma_power, cp\fR" 4 yading@10: .IX Item "chroma_power, cp" yading@10: .IP "\fBalpha_radius, ar\fR" 4 yading@10: .IX Item "alpha_radius, ar" yading@10: .IP "\fBalpha_power, ap\fR" 4 yading@10: .IX Item "alpha_power, ap" yading@10: .PD yading@10: .PP yading@10: A description of the accepted options follows. yading@10: .IP "\fBluma_radius, lr\fR" 4 yading@10: .IX Item "luma_radius, lr" yading@10: .PD 0 yading@10: .IP "\fBchroma_radius, cr\fR" 4 yading@10: .IX Item "chroma_radius, cr" yading@10: .IP "\fBalpha_radius, ar\fR" 4 yading@10: .IX Item "alpha_radius, ar" yading@10: .PD yading@10: Set an expression for the box radius in pixels used for blurring the yading@10: corresponding input plane. yading@10: .Sp yading@10: The radius value must be a non-negative number, and must not be yading@10: greater than the value of the expression \f(CW\*(C`min(w,h)/2\*(C'\fR for the yading@10: luma and alpha planes, and of \f(CW\*(C`min(cw,ch)/2\*(C'\fR for the chroma yading@10: planes. yading@10: .Sp yading@10: Default value for \fBluma_radius\fR is \*(L"2\*(R". If not specified, yading@10: \&\fBchroma_radius\fR and \fBalpha_radius\fR default to the yading@10: corresponding value set for \fBluma_radius\fR. yading@10: .Sp yading@10: The expressions can contain the following constants: yading@10: .RS 4 yading@10: .IP "\fBw, h\fR" 4 yading@10: .IX Item "w, h" yading@10: the input width and height in pixels yading@10: .IP "\fBcw, ch\fR" 4 yading@10: .IX Item "cw, ch" yading@10: the input chroma image width and height in pixels yading@10: .IP "\fBhsub, vsub\fR" 4 yading@10: .IX Item "hsub, vsub" yading@10: horizontal and vertical chroma subsample values. For example for the yading@10: pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and \fIvsub\fR is 1. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBluma_power, lp\fR" 4 yading@10: .IX Item "luma_power, lp" yading@10: .PD 0 yading@10: .IP "\fBchroma_power, cp\fR" 4 yading@10: .IX Item "chroma_power, cp" yading@10: .IP "\fBalpha_power, ap\fR" 4 yading@10: .IX Item "alpha_power, ap" yading@10: .PD yading@10: Specify how many times the boxblur filter is applied to the yading@10: corresponding plane. yading@10: .Sp yading@10: Default value for \fBluma_power\fR is 2. If not specified, yading@10: \&\fBchroma_power\fR and \fBalpha_power\fR default to the yading@10: corresponding value set for \fBluma_power\fR. yading@10: .Sp yading@10: A value of 0 will disable the effect. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply a boxblur filter with luma, chroma, and alpha radius yading@10: set to 2: yading@10: .Sp yading@10: .Vb 2 yading@10: \& boxblur=luma_radius=2:luma_power=1 yading@10: \& boxblur=2:1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set luma radius to 2, alpha and chroma radius to 0: yading@10: .Sp yading@10: .Vb 1 yading@10: \& boxblur=2:1:cr=0:ar=0 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set luma and chroma radius to a fraction of the video dimension: yading@10: .Sp yading@10: .Vb 1 yading@10: \& boxblur=luma_radius=min(h\e,w)/10:luma_power=1:chroma_radius=min(cw\e,ch)/10:chroma_power=1 yading@10: .Ve yading@10: .SS "colorbalance" yading@10: .IX Subsection "colorbalance" yading@10: Modify intensity of primary colors (red, green and blue) of input frames. yading@10: .PP yading@10: The filter allows an input frame to be adjusted in the shadows, midtones or highlights yading@10: regions for the red-cyan, green-magenta or blue-yellow balance. yading@10: .PP yading@10: A positive adjustment value shifts the balance towards the primary color, a negative yading@10: value towards the complementary color. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBrs\fR" 4 yading@10: .IX Item "rs" yading@10: .PD 0 yading@10: .IP "\fBgs\fR" 4 yading@10: .IX Item "gs" yading@10: .IP "\fBbs\fR" 4 yading@10: .IX Item "bs" yading@10: .PD yading@10: Adjust red, green and blue shadows (darkest pixels). yading@10: .IP "\fBrm\fR" 4 yading@10: .IX Item "rm" yading@10: .PD 0 yading@10: .IP "\fBgm\fR" 4 yading@10: .IX Item "gm" yading@10: .IP "\fBbm\fR" 4 yading@10: .IX Item "bm" yading@10: .PD yading@10: Adjust red, green and blue midtones (medium pixels). yading@10: .IP "\fBrh\fR" 4 yading@10: .IX Item "rh" yading@10: .PD 0 yading@10: .IP "\fBgh\fR" 4 yading@10: .IX Item "gh" yading@10: .IP "\fBbh\fR" 4 yading@10: .IX Item "bh" yading@10: .PD yading@10: Adjust red, green and blue highlights (brightest pixels). yading@10: .Sp yading@10: Allowed ranges for options are \f(CW\*(C`[\-1.0, 1.0]\*(C'\fR. Defaults are \f(CW0\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Add red color cast to shadows: yading@10: .Sp yading@10: .Vb 1 yading@10: \& colorbalance=rs=.3 yading@10: .Ve yading@10: .SS "colorchannelmixer" yading@10: .IX Subsection "colorchannelmixer" yading@10: Adjust video input frames by re-mixing color channels. yading@10: .PP yading@10: This filter modifies a color channel by adding the values associated to yading@10: the other channels of the same pixels. For example if the value to yading@10: modify is red, the output value will be: yading@10: .PP yading@10: .Vb 1 yading@10: \& =* + * + * + * yading@10: .Ve yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBrr\fR" 4 yading@10: .IX Item "rr" yading@10: .PD 0 yading@10: .IP "\fBrg\fR" 4 yading@10: .IX Item "rg" yading@10: .IP "\fBrb\fR" 4 yading@10: .IX Item "rb" yading@10: .IP "\fBra\fR" 4 yading@10: .IX Item "ra" yading@10: .PD yading@10: Adjust contribution of input red, green, blue and alpha channels for output red channel. yading@10: Default is \f(CW1\fR for \fIrr\fR, and \f(CW0\fR for \fIrg\fR, \fIrb\fR and \fIra\fR. yading@10: .IP "\fBgr\fR" 4 yading@10: .IX Item "gr" yading@10: .PD 0 yading@10: .IP "\fBgg\fR" 4 yading@10: .IX Item "gg" yading@10: .IP "\fBgb\fR" 4 yading@10: .IX Item "gb" yading@10: .IP "\fBga\fR" 4 yading@10: .IX Item "ga" yading@10: .PD yading@10: Adjust contribution of input red, green, blue and alpha channels for output green channel. yading@10: Default is \f(CW1\fR for \fIgg\fR, and \f(CW0\fR for \fIgr\fR, \fIgb\fR and \fIga\fR. yading@10: .IP "\fBbr\fR" 4 yading@10: .IX Item "br" yading@10: .PD 0 yading@10: .IP "\fBbg\fR" 4 yading@10: .IX Item "bg" yading@10: .IP "\fBbb\fR" 4 yading@10: .IX Item "bb" yading@10: .IP "\fBba\fR" 4 yading@10: .IX Item "ba" yading@10: .PD yading@10: Adjust contribution of input red, green, blue and alpha channels for output blue channel. yading@10: Default is \f(CW1\fR for \fIbb\fR, and \f(CW0\fR for \fIbr\fR, \fIbg\fR and \fIba\fR. yading@10: .IP "\fBar\fR" 4 yading@10: .IX Item "ar" yading@10: .PD 0 yading@10: .IP "\fBag\fR" 4 yading@10: .IX Item "ag" yading@10: .IP "\fBab\fR" 4 yading@10: .IX Item "ab" yading@10: .IP "\fBaa\fR" 4 yading@10: .IX Item "aa" yading@10: .PD yading@10: Adjust contribution of input red, green, blue and alpha channels for output alpha channel. yading@10: Default is \f(CW1\fR for \fIaa\fR, and \f(CW0\fR for \fIar\fR, \fIag\fR and \fIab\fR. yading@10: .Sp yading@10: Allowed ranges for options are \f(CW\*(C`[\-2.0, 2.0]\*(C'\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Convert source to grayscale: yading@10: .Sp yading@10: .Vb 1 yading@10: \& colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3 yading@10: .Ve yading@10: .SS "colormatrix" yading@10: .IX Subsection "colormatrix" yading@10: Convert color matrix. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBsrc\fR" 4 yading@10: .IX Item "src" yading@10: .PD 0 yading@10: .IP "\fBdst\fR" 4 yading@10: .IX Item "dst" yading@10: .PD yading@10: Specify the source and destination color matrix. Both values must be yading@10: specified. yading@10: .Sp yading@10: The accepted values are: yading@10: .RS 4 yading@10: .IP "\fBbt709\fR" 4 yading@10: .IX Item "bt709" yading@10: \&\s-1BT\s0.709 yading@10: .IP "\fBbt601\fR" 4 yading@10: .IX Item "bt601" yading@10: \&\s-1BT\s0.601 yading@10: .IP "\fBsmpte240m\fR" 4 yading@10: .IX Item "smpte240m" yading@10: \&\s-1SMPTE\-240M\s0 yading@10: .IP "\fBfcc\fR" 4 yading@10: .IX Item "fcc" yading@10: \&\s-1FCC\s0 yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: For example to convert from \s-1BT\s0.601 to \s-1SMPTE\-240M\s0, use the command: yading@10: .PP yading@10: .Vb 1 yading@10: \& colormatrix=bt601:smpte240m yading@10: .Ve yading@10: .SS "copy" yading@10: .IX Subsection "copy" yading@10: Copy the input source unchanged to the output. Mainly useful for yading@10: testing purposes. yading@10: .SS "crop" yading@10: .IX Subsection "crop" yading@10: Crop the input video to given dimensions. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBw, out_w\fR" 4 yading@10: .IX Item "w, out_w" yading@10: Width of the output video. It defaults to \f(CW\*(C`iw\*(C'\fR. yading@10: This expression is evaluated only once during the filter yading@10: configuration. yading@10: .IP "\fBh, out_h\fR" 4 yading@10: .IX Item "h, out_h" yading@10: Height of the output video. It defaults to \f(CW\*(C`ih\*(C'\fR. yading@10: This expression is evaluated only once during the filter yading@10: configuration. yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: Horizontal position, in the input video, of the left edge of the output video. yading@10: It defaults to \f(CW\*(C`(in_w\-out_w)/2\*(C'\fR. yading@10: This expression is evaluated per-frame. yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: Vertical position, in the input video, of the top edge of the output video. yading@10: It defaults to \f(CW\*(C`(in_h\-out_h)/2\*(C'\fR. yading@10: This expression is evaluated per-frame. yading@10: .IP "\fBkeep_aspect\fR" 4 yading@10: .IX Item "keep_aspect" yading@10: If set to 1 will force the output display aspect ratio yading@10: to be the same of the input, by changing the output sample aspect yading@10: ratio. It defaults to 0. yading@10: .PP yading@10: The \fIout_w\fR, \fIout_h\fR, \fIx\fR, \fIy\fR parameters are yading@10: expressions containing the following constants: yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: the computed values for \fIx\fR and \fIy\fR. They are evaluated for yading@10: each new frame. yading@10: .IP "\fBin_w, in_h\fR" 4 yading@10: .IX Item "in_w, in_h" yading@10: the input width and height yading@10: .IP "\fBiw, ih\fR" 4 yading@10: .IX Item "iw, ih" yading@10: same as \fIin_w\fR and \fIin_h\fR yading@10: .IP "\fBout_w, out_h\fR" 4 yading@10: .IX Item "out_w, out_h" yading@10: the output (cropped) width and height yading@10: .IP "\fBow, oh\fR" 4 yading@10: .IX Item "ow, oh" yading@10: same as \fIout_w\fR and \fIout_h\fR yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: same as \fIiw\fR / \fIih\fR yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: input sample aspect ratio yading@10: .IP "\fBdar\fR" 4 yading@10: .IX Item "dar" yading@10: input display aspect ratio, it is the same as (\fIiw\fR / \fIih\fR) * \fIsar\fR yading@10: .IP "\fBhsub, vsub\fR" 4 yading@10: .IX Item "hsub, vsub" yading@10: horizontal and vertical chroma subsample values. For example for the yading@10: pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and \fIvsub\fR is 1. yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: the number of input frame, starting from 0 yading@10: .IP "\fBpos\fR" 4 yading@10: .IX Item "pos" yading@10: the position in the file of the input frame, \s-1NAN\s0 if unknown yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: timestamp expressed in seconds, \s-1NAN\s0 if the input timestamp is unknown yading@10: .PP yading@10: The expression for \fIout_w\fR may depend on the value of \fIout_h\fR, yading@10: and the expression for \fIout_h\fR may depend on \fIout_w\fR, but they yading@10: cannot depend on \fIx\fR and \fIy\fR, as \fIx\fR and \fIy\fR are yading@10: evaluated after \fIout_w\fR and \fIout_h\fR. yading@10: .PP yading@10: The \fIx\fR and \fIy\fR parameters specify the expressions for the yading@10: position of the top-left corner of the output (non-cropped) area. They yading@10: are evaluated for each frame. If the evaluated value is not valid, it yading@10: is approximated to the nearest valid value. yading@10: .PP yading@10: The expression for \fIx\fR may depend on \fIy\fR, and the expression yading@10: for \fIy\fR may depend on \fIx\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Crop area with size 100x100 at position (12,34). yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=100:100:12:34 yading@10: .Ve yading@10: .Sp yading@10: Using named options, the example above becomes: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=w=100:h=100:x=12:y=34 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Crop the central input area with size 100x100: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=100:100 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Crop the central input area with size 2/3 of the input video: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=2/3*in_w:2/3*in_h yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Crop the input video central square: yading@10: .Sp yading@10: .Vb 2 yading@10: \& crop=out_w=in_h yading@10: \& crop=in_h yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Delimit the rectangle with the top-left corner placed at position yading@10: 100:100 and the right-bottom corner corresponding to the right-bottom yading@10: corner of the input image: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w\-100:in_h\-100:100:100 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Crop 10 pixels from the left and right borders, and 20 pixels from yading@10: the top and bottom borders yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w\-2*10:in_h\-2*20 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Keep only the bottom right quarter of the input image: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w/2:in_h/2:in_w/2:in_h/2 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Crop height for getting Greek harmony: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w:1/PHI*in_w yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Appply trembling effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w/2:in_h/2:(in_w\-out_w)/2+((in_w\-out_w)/2)*sin(n/10):(in_h\-out_h)/2 +((in_h\-out_h)/2)*sin(n/7) yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply erratic camera effect depending on timestamp: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w/2:in_h/2:(in_w\-out_w)/2+((in_w\-out_w)/2)*sin(t*10):(in_h\-out_h)/2 +((in_h\-out_h)/2)*sin(t*13)" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set x depending on the value of y: yading@10: .Sp yading@10: .Vb 1 yading@10: \& crop=in_w/2:in_h/2:y:10+10*sin(n/10) yading@10: .Ve yading@10: .SS "cropdetect" yading@10: .IX Subsection "cropdetect" yading@10: Auto-detect crop size. yading@10: .PP yading@10: Calculate necessary cropping parameters and prints the recommended yading@10: parameters through the logging system. The detected dimensions yading@10: correspond to the non-black area of the input video. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBlimit\fR" 4 yading@10: .IX Item "limit" yading@10: Set higher black value threshold, which can be optionally specified yading@10: from nothing (0) to everything (255). An intensity value greater yading@10: to the set value is considered non-black. Default value is 24. yading@10: .IP "\fBround\fR" 4 yading@10: .IX Item "round" yading@10: Set the value for which the width/height should be divisible by. The yading@10: offset is automatically adjusted to center the video. Use 2 to get yading@10: only even dimensions (needed for 4:2:2 video). 16 is best when yading@10: encoding to most video codecs. Default value is 16. yading@10: .IP "\fBreset_count, reset\fR" 4 yading@10: .IX Item "reset_count, reset" yading@10: Set the counter that determines after how many frames cropdetect will yading@10: reset the previously detected largest video area and start over to yading@10: detect the current optimal crop area. Default value is 0. yading@10: .Sp yading@10: This can be useful when channel logos distort the video area. 0 yading@10: indicates never reset and return the largest area encountered during yading@10: playback. yading@10: .SS "curves" yading@10: .IX Subsection "curves" yading@10: Apply color adjustments using curves. yading@10: .PP yading@10: This filter is similar to the Adobe Photoshop and \s-1GIMP\s0 curves tools. Each yading@10: component (red, green and blue) has its values defined by \fIN\fR key points yading@10: tied from each other using a smooth curve. The x\-axis represents the pixel yading@10: values from the input frame, and the y\-axis the new pixel values to be set for yading@10: the output frame. yading@10: .PP yading@10: By default, a component curve is defined by the two points \fI(0;0)\fR and yading@10: \&\fI(1;1)\fR. This creates a straight line where each original pixel value is yading@10: \&\*(L"adjusted\*(R" to its own value, which means no change to the image. yading@10: .PP yading@10: The filter allows you to redefine these two points and add some more. A new yading@10: curve (using a natural cubic spline interpolation) will be define to pass yading@10: smoothly through all these new coordinates. The new defined points needs to be yading@10: strictly increasing over the x\-axis, and their \fIx\fR and \fIy\fR values must yading@10: be in the \fI[0;1]\fR interval. If the computed curves happened to go outside yading@10: the vector spaces, the values will be clipped accordingly. yading@10: .PP yading@10: If there is no key point defined in \f(CW\*(C`x=0\*(C'\fR, the filter will automatically yading@10: insert a \fI(0;0)\fR point. In the same way, if there is no key point defined yading@10: in \f(CW\*(C`x=1\*(C'\fR, the filter will automatically insert a \fI(1;1)\fR point. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBpreset\fR" 4 yading@10: .IX Item "preset" yading@10: Select one of the available color presets. This option can be used in addition yading@10: to the \fBr\fR, \fBg\fR, \fBb\fR parameters; in this case, the later yading@10: options takes priority on the preset values. yading@10: Available presets are: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: .PD 0 yading@10: .IP "\fBcolor_negative\fR" 4 yading@10: .IX Item "color_negative" yading@10: .IP "\fBcross_process\fR" 4 yading@10: .IX Item "cross_process" yading@10: .IP "\fBdarker\fR" 4 yading@10: .IX Item "darker" yading@10: .IP "\fBincrease_contrast\fR" 4 yading@10: .IX Item "increase_contrast" yading@10: .IP "\fBlighter\fR" 4 yading@10: .IX Item "lighter" yading@10: .IP "\fBlinear_contrast\fR" 4 yading@10: .IX Item "linear_contrast" yading@10: .IP "\fBmedium_contrast\fR" 4 yading@10: .IX Item "medium_contrast" yading@10: .IP "\fBnegative\fR" 4 yading@10: .IX Item "negative" yading@10: .IP "\fBstrong_contrast\fR" 4 yading@10: .IX Item "strong_contrast" yading@10: .IP "\fBvintage\fR" 4 yading@10: .IX Item "vintage" yading@10: .RE yading@10: .RS 4 yading@10: .PD yading@10: .Sp yading@10: Default is \f(CW\*(C`none\*(C'\fR. yading@10: .RE yading@10: .IP "\fBmaster, m\fR" 4 yading@10: .IX Item "master, m" yading@10: Set the master key points. These points will define a second pass mapping. It yading@10: is sometimes called a \*(L"luminance\*(R" or \*(L"value\*(R" mapping. It can be used with yading@10: \&\fBr\fR, \fBg\fR, \fBb\fR or \fBall\fR since it acts like a yading@10: post-processing \s-1LUT\s0. yading@10: .IP "\fBred, r\fR" 4 yading@10: .IX Item "red, r" yading@10: Set the key points for the red component. yading@10: .IP "\fBgreen, g\fR" 4 yading@10: .IX Item "green, g" yading@10: Set the key points for the green component. yading@10: .IP "\fBblue, b\fR" 4 yading@10: .IX Item "blue, b" yading@10: Set the key points for the blue component. yading@10: .IP "\fBall\fR" 4 yading@10: .IX Item "all" yading@10: Set the key points for all components (not including master). yading@10: Can be used in addition to the other key points component yading@10: options. In this case, the unset component(s) will fallback on this yading@10: \&\fBall\fR setting. yading@10: .IP "\fBpsfile\fR" 4 yading@10: .IX Item "psfile" yading@10: Specify a Photoshop curves file (\f(CW\*(C`.asv\*(C'\fR) to import the settings from. yading@10: .PP yading@10: To avoid some filtergraph syntax conflicts, each key points list need to be yading@10: defined using the following syntax: \f(CW\*(C`x0/y0 x1/y1 x2/y2 ...\*(C'\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Increase slightly the middle level of blue: yading@10: .Sp yading@10: .Vb 1 yading@10: \& curves=blue=\*(Aq0.5/0.58\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Vintage effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& curves=r=\*(Aq0/0.11 .42/.51 1/0.95\*(Aq:g=\*(Aq0.50/0.48\*(Aq:b=\*(Aq0/0.22 .49/.44 1/0.8\*(Aq yading@10: .Ve yading@10: .Sp yading@10: Here we obtain the following coordinates for each components: yading@10: .RS 4 yading@10: .IP "\fIred\fR" 4 yading@10: .IX Item "red" yading@10: \&\f(CW\*(C`(0;0.11) (0.42;0.51) (1;0.95)\*(C'\fR yading@10: .IP "\fIgreen\fR" 4 yading@10: .IX Item "green" yading@10: \&\f(CW\*(C`(0;0) (0.50;0.48) (1;1)\*(C'\fR yading@10: .IP "\fIblue\fR" 4 yading@10: .IX Item "blue" yading@10: \&\f(CW\*(C`(0;0.22) (0.49;0.44) (1;0.80)\*(C'\fR yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\(bu" 4 yading@10: The previous example can also be achieved with the associated built-in preset: yading@10: .Sp yading@10: .Vb 1 yading@10: \& curves=preset=vintage yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Or simply: yading@10: .Sp yading@10: .Vb 1 yading@10: \& curves=vintage yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Use a Photoshop preset and redefine the points of the green component: yading@10: .Sp yading@10: .Vb 1 yading@10: \& curves=psfile=\*(AqMyCurvesPresets/purple.asv\*(Aq:green=\*(Aq0.45/0.53\*(Aq yading@10: .Ve yading@10: .SS "decimate" yading@10: .IX Subsection "decimate" yading@10: Drop duplicated frames at regular intervals. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBcycle\fR" 4 yading@10: .IX Item "cycle" yading@10: Set the number of frames from which one will be dropped. Setting this to yading@10: \&\fIN\fR means one frame in every batch of \fIN\fR frames will be dropped. yading@10: Default is \f(CW5\fR. yading@10: .IP "\fBdupthresh\fR" 4 yading@10: .IX Item "dupthresh" yading@10: Set the threshold for duplicate detection. If the difference metric for a frame yading@10: is less than or equal to this value, then it is declared as duplicate. Default yading@10: is \f(CW1.1\fR yading@10: .IP "\fBscthresh\fR" 4 yading@10: .IX Item "scthresh" yading@10: Set scene change threshold. Default is \f(CW15\fR. yading@10: .IP "\fBblockx\fR" 4 yading@10: .IX Item "blockx" yading@10: .PD 0 yading@10: .IP "\fBblocky\fR" 4 yading@10: .IX Item "blocky" yading@10: .PD yading@10: Set the size of the x and y\-axis blocks used during metric calculations. yading@10: Larger blocks give better noise suppression, but also give worse detection of yading@10: small movements. Must be a power of two. Default is \f(CW32\fR. yading@10: .IP "\fBppsrc\fR" 4 yading@10: .IX Item "ppsrc" yading@10: Mark main input as a pre-processed input and activate clean source input yading@10: stream. This allows the input to be pre-processed with various filters to help yading@10: the metrics calculation while keeping the frame selection lossless. When set to yading@10: \&\f(CW1\fR, the first stream is for the pre-processed input, and the second yading@10: stream is the clean source from where the kept frames are chosen. Default is yading@10: \&\f(CW0\fR. yading@10: .IP "\fBchroma\fR" 4 yading@10: .IX Item "chroma" yading@10: Set whether or not chroma is considered in the metric calculations. Default is yading@10: \&\f(CW1\fR. yading@10: .SS "delogo" yading@10: .IX Subsection "delogo" yading@10: Suppress a \s-1TV\s0 station logo by a simple interpolation of the surrounding yading@10: pixels. Just set a rectangle covering the logo and watch it disappear yading@10: (and sometimes something even uglier appear \- your mileage may vary). yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: Specify the top left corner coordinates of the logo. They must be yading@10: specified. yading@10: .IP "\fBw, h\fR" 4 yading@10: .IX Item "w, h" yading@10: Specify the width and height of the logo to clear. They must be yading@10: specified. yading@10: .IP "\fBband, t\fR" 4 yading@10: .IX Item "band, t" yading@10: Specify the thickness of the fuzzy edge of the rectangle (added to yading@10: \&\fIw\fR and \fIh\fR). The default value is 4. yading@10: .IP "\fBshow\fR" 4 yading@10: .IX Item "show" yading@10: When set to 1, a green rectangle is drawn on the screen to simplify yading@10: finding the right \fIx\fR, \fIy\fR, \fIw\fR, \fIh\fR parameters, and yading@10: \&\fIband\fR is set to 4. The default value is 0. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Set a rectangle covering the area with top left corner coordinates 0,0 yading@10: and size 100x77, setting a band of size 10: yading@10: .Sp yading@10: .Vb 1 yading@10: \& delogo=x=0:y=0:w=100:h=77:band=10 yading@10: .Ve yading@10: .SS "deshake" yading@10: .IX Subsection "deshake" yading@10: Attempt to fix small changes in horizontal and/or vertical shift. This yading@10: filter helps remove camera shake from hand-holding a camera, bumping a yading@10: tripod, moving on a vehicle, etc. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: .PD 0 yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: .IP "\fBw\fR" 4 yading@10: .IX Item "w" yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: .PD yading@10: Specify a rectangular area where to limit the search for motion yading@10: vectors. yading@10: If desired the search for motion vectors can be limited to a yading@10: rectangular area of the frame defined by its top left corner, width yading@10: and height. These parameters have the same meaning as the drawbox yading@10: filter which can be used to visualise the position of the bounding yading@10: box. yading@10: .Sp yading@10: This is useful when simultaneous movement of subjects within the frame yading@10: might be confused for camera motion by the motion vector search. yading@10: .Sp yading@10: If any or all of \fIx\fR, \fIy\fR, \fIw\fR and \fIh\fR are set to \-1 yading@10: then the full frame is used. This allows later options to be set yading@10: without specifying the bounding box for the motion vector search. yading@10: .Sp yading@10: Default \- search the whole frame. yading@10: .IP "\fBrx\fR" 4 yading@10: .IX Item "rx" yading@10: .PD 0 yading@10: .IP "\fBry\fR" 4 yading@10: .IX Item "ry" yading@10: .PD yading@10: Specify the maximum extent of movement in x and y directions in the yading@10: range 0\-64 pixels. Default 16. yading@10: .IP "\fBedge\fR" 4 yading@10: .IX Item "edge" yading@10: Specify how to generate pixels to fill blanks at the edge of the yading@10: frame. Available values are: yading@10: .RS 4 yading@10: .IP "\fBblank, 0\fR" 4 yading@10: .IX Item "blank, 0" yading@10: Fill zeroes at blank locations yading@10: .IP "\fBoriginal, 1\fR" 4 yading@10: .IX Item "original, 1" yading@10: Original image at blank locations yading@10: .IP "\fBclamp, 2\fR" 4 yading@10: .IX Item "clamp, 2" yading@10: Extruded edge value at blank locations yading@10: .IP "\fBmirror, 3\fR" 4 yading@10: .IX Item "mirror, 3" yading@10: Mirrored edge at blank locations yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBmirror\fR. yading@10: .RE yading@10: .IP "\fBblocksize\fR" 4 yading@10: .IX Item "blocksize" yading@10: Specify the blocksize to use for motion search. Range 4\-128 pixels, yading@10: default 8. yading@10: .IP "\fBcontrast\fR" 4 yading@10: .IX Item "contrast" yading@10: Specify the contrast threshold for blocks. Only blocks with more than yading@10: the specified contrast (difference between darkest and lightest yading@10: pixels) will be considered. Range 1\-255, default 125. yading@10: .IP "\fBsearch\fR" 4 yading@10: .IX Item "search" yading@10: Specify the search strategy. Available values are: yading@10: .RS 4 yading@10: .IP "\fBexhaustive, 0\fR" 4 yading@10: .IX Item "exhaustive, 0" yading@10: Set exhaustive search yading@10: .IP "\fBless, 1\fR" 4 yading@10: .IX Item "less, 1" yading@10: Set less exhaustive search. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBexhaustive\fR. yading@10: .RE yading@10: .IP "\fBfilename\fR" 4 yading@10: .IX Item "filename" yading@10: If set then a detailed log of the motion search is written to the yading@10: specified file. yading@10: .IP "\fBopencl\fR" 4 yading@10: .IX Item "opencl" yading@10: If set to 1, specify using OpenCL capabilities, only available if yading@10: FFmpeg was configured with \f(CW\*(C`\-\-enable\-opencl\*(C'\fR. Default value is 0. yading@10: .SS "drawbox" yading@10: .IX Subsection "drawbox" yading@10: Draw a colored box on the input image. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: Specify the top left corner coordinates of the box. Default to 0. yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: .PD 0 yading@10: .IP "\fBheight, h\fR" 4 yading@10: .IX Item "height, h" yading@10: .PD yading@10: Specify the width and height of the box, if 0 they are interpreted as yading@10: the input width and height. Default to 0. yading@10: .IP "\fBcolor, c\fR" 4 yading@10: .IX Item "color, c" yading@10: Specify the color of the box to write, it can be the name of a color yading@10: (case insensitive match) or a 0xRRGGBB[\s-1AA\s0] sequence. If the special yading@10: value \f(CW\*(C`invert\*(C'\fR is used, the box edge color is the same as the yading@10: video with inverted luma. yading@10: .IP "\fBthickness, t\fR" 4 yading@10: .IX Item "thickness, t" yading@10: Set the thickness of the box edge. Default value is \f(CW4\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Draw a black box around the edge of the input image: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawbox yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Draw a box with color red and an opacity of 50%: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawbox=10:20:200:60:red@0.5 yading@10: .Ve yading@10: .Sp yading@10: The previous example can be specified as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawbox=x=10:y=20:w=200:h=60:color=red@0.5 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Fill the box with pink color: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=max yading@10: .Ve yading@10: .SS "drawtext" yading@10: .IX Subsection "drawtext" yading@10: Draw text string or text from specified file on top of video using the yading@10: libfreetype library. yading@10: .PP yading@10: To enable compilation of this filter you need to configure FFmpeg with yading@10: \&\f(CW\*(C`\-\-enable\-libfreetype\*(C'\fR. yading@10: .PP yading@10: \fISyntax\fR yading@10: .IX Subsection "Syntax" yading@10: .PP yading@10: The description of the accepted parameters follows. yading@10: .IP "\fBbox\fR" 4 yading@10: .IX Item "box" yading@10: Used to draw a box around text using background color. yading@10: Value should be either 1 (enable) or 0 (disable). yading@10: The default value of \fIbox\fR is 0. yading@10: .IP "\fBboxcolor\fR" 4 yading@10: .IX Item "boxcolor" yading@10: The color to be used for drawing box around text. yading@10: Either a string (e.g. \*(L"yellow\*(R") or in 0xRRGGBB[\s-1AA\s0] format yading@10: (e.g. \*(L"0xff00ff\*(R"), possibly followed by an alpha specifier. yading@10: The default value of \fIboxcolor\fR is \*(L"white\*(R". yading@10: .IP "\fBdraw\fR" 4 yading@10: .IX Item "draw" yading@10: Set an expression which specifies if the text should be drawn. If the yading@10: expression evaluates to 0, the text is not drawn. This is useful for yading@10: specifying that the text should be drawn only when specific conditions yading@10: are met. yading@10: .Sp yading@10: Default value is \*(L"1\*(R". yading@10: .Sp yading@10: See below for the list of accepted constants and functions. yading@10: .IP "\fBexpansion\fR" 4 yading@10: .IX Item "expansion" yading@10: Select how the \fItext\fR is expanded. Can be either \f(CW\*(C`none\*(C'\fR, yading@10: \&\f(CW\*(C`strftime\*(C'\fR (deprecated) or yading@10: \&\f(CW\*(C`normal\*(C'\fR (default). See the drawtext_expansion, Text expansion section yading@10: below for details. yading@10: .IP "\fBfix_bounds\fR" 4 yading@10: .IX Item "fix_bounds" yading@10: If true, check and fix text coords to avoid clipping. yading@10: .IP "\fBfontcolor\fR" 4 yading@10: .IX Item "fontcolor" yading@10: The color to be used for drawing fonts. yading@10: Either a string (e.g. \*(L"red\*(R") or in 0xRRGGBB[\s-1AA\s0] format yading@10: (e.g. \*(L"0xff000033\*(R"), possibly followed by an alpha specifier. yading@10: The default value of \fIfontcolor\fR is \*(L"black\*(R". yading@10: .IP "\fBfontfile\fR" 4 yading@10: .IX Item "fontfile" yading@10: The font file to be used for drawing text. Path must be included. yading@10: This parameter is mandatory. yading@10: .IP "\fBfontsize\fR" 4 yading@10: .IX Item "fontsize" yading@10: The font size to be used for drawing text. yading@10: The default value of \fIfontsize\fR is 16. yading@10: .IP "\fBft_load_flags\fR" 4 yading@10: .IX Item "ft_load_flags" yading@10: Flags to be used for loading the fonts. yading@10: .Sp yading@10: The flags map the corresponding flags supported by libfreetype, and are yading@10: a combination of the following values: yading@10: .RS 4 yading@10: .IP "\fIdefault\fR" 4 yading@10: .IX Item "default" yading@10: .PD 0 yading@10: .IP "\fIno_scale\fR" 4 yading@10: .IX Item "no_scale" yading@10: .IP "\fIno_hinting\fR" 4 yading@10: .IX Item "no_hinting" yading@10: .IP "\fIrender\fR" 4 yading@10: .IX Item "render" yading@10: .IP "\fIno_bitmap\fR" 4 yading@10: .IX Item "no_bitmap" yading@10: .IP "\fIvertical_layout\fR" 4 yading@10: .IX Item "vertical_layout" yading@10: .IP "\fIforce_autohint\fR" 4 yading@10: .IX Item "force_autohint" yading@10: .IP "\fIcrop_bitmap\fR" 4 yading@10: .IX Item "crop_bitmap" yading@10: .IP "\fIpedantic\fR" 4 yading@10: .IX Item "pedantic" yading@10: .IP "\fIignore_global_advance_width\fR" 4 yading@10: .IX Item "ignore_global_advance_width" yading@10: .IP "\fIno_recurse\fR" 4 yading@10: .IX Item "no_recurse" yading@10: .IP "\fIignore_transform\fR" 4 yading@10: .IX Item "ignore_transform" yading@10: .IP "\fImonochrome\fR" 4 yading@10: .IX Item "monochrome" yading@10: .IP "\fIlinear_design\fR" 4 yading@10: .IX Item "linear_design" yading@10: .IP "\fIno_autohint\fR" 4 yading@10: .IX Item "no_autohint" yading@10: .IP "\fIend table\fR" 4 yading@10: .IX Item "end table" yading@10: .RE yading@10: .RS 4 yading@10: .PD yading@10: .Sp yading@10: Default value is \*(L"render\*(R". yading@10: .Sp yading@10: For more information consult the documentation for the FT_LOAD_* yading@10: libfreetype flags. yading@10: .RE yading@10: .IP "\fBshadowcolor\fR" 4 yading@10: .IX Item "shadowcolor" yading@10: The color to be used for drawing a shadow behind the drawn text. It yading@10: can be a color name (e.g. \*(L"yellow\*(R") or a string in the 0xRRGGBB[\s-1AA\s0] yading@10: form (e.g. \*(L"0xff00ff\*(R"), possibly followed by an alpha specifier. yading@10: The default value of \fIshadowcolor\fR is \*(L"black\*(R". yading@10: .IP "\fBshadowx, shadowy\fR" 4 yading@10: .IX Item "shadowx, shadowy" yading@10: The x and y offsets for the text shadow position with respect to the yading@10: position of the text. They can be either positive or negative yading@10: values. Default value for both is \*(L"0\*(R". yading@10: .IP "\fBtabsize\fR" 4 yading@10: .IX Item "tabsize" yading@10: The size in number of spaces to use for rendering the tab. yading@10: Default value is 4. yading@10: .IP "\fBtimecode\fR" 4 yading@10: .IX Item "timecode" yading@10: Set the initial timecode representation in \*(L"hh:mm:ss[:;.]ff\*(R" yading@10: format. It can be used with or without text parameter. \fItimecode_rate\fR yading@10: option must be specified. yading@10: .IP "\fBtimecode_rate, rate, r\fR" 4 yading@10: .IX Item "timecode_rate, rate, r" yading@10: Set the timecode frame rate (timecode only). yading@10: .IP "\fBtext\fR" 4 yading@10: .IX Item "text" yading@10: The text string to be drawn. The text must be a sequence of \s-1UTF\-8\s0 yading@10: encoded characters. yading@10: This parameter is mandatory if no file is specified with the parameter yading@10: \&\fItextfile\fR. yading@10: .IP "\fBtextfile\fR" 4 yading@10: .IX Item "textfile" yading@10: A text file containing text to be drawn. The text must be a sequence yading@10: of \s-1UTF\-8\s0 encoded characters. yading@10: .Sp yading@10: This parameter is mandatory if no text string is specified with the yading@10: parameter \fItext\fR. yading@10: .Sp yading@10: If both \fItext\fR and \fItextfile\fR are specified, an error is thrown. yading@10: .IP "\fBreload\fR" 4 yading@10: .IX Item "reload" yading@10: If set to 1, the \fItextfile\fR will be reloaded before each frame. yading@10: Be sure to update it atomically, or it may be read partially, or even fail. yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: The expressions which specify the offsets where text will be drawn yading@10: within the video frame. They are relative to the top/left border of the yading@10: output image. yading@10: .Sp yading@10: The default value of \fIx\fR and \fIy\fR is \*(L"0\*(R". yading@10: .Sp yading@10: See below for the list of accepted constants and functions. yading@10: .PP yading@10: The parameters for \fIx\fR and \fIy\fR are expressions containing the yading@10: following constants and functions: yading@10: .IP "\fBdar\fR" 4 yading@10: .IX Item "dar" yading@10: input display aspect ratio, it is the same as (\fIw\fR / \fIh\fR) * \fIsar\fR yading@10: .IP "\fBhsub, vsub\fR" 4 yading@10: .IX Item "hsub, vsub" yading@10: horizontal and vertical chroma subsample values. For example for the yading@10: pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and \fIvsub\fR is 1. yading@10: .IP "\fBline_h, lh\fR" 4 yading@10: .IX Item "line_h, lh" yading@10: the height of each text line yading@10: .IP "\fBmain_h, h, H\fR" 4 yading@10: .IX Item "main_h, h, H" yading@10: the input height yading@10: .IP "\fBmain_w, w, W\fR" 4 yading@10: .IX Item "main_w, w, W" yading@10: the input width yading@10: .IP "\fBmax_glyph_a, ascent\fR" 4 yading@10: .IX Item "max_glyph_a, ascent" yading@10: the maximum distance from the baseline to the highest/upper grid yading@10: coordinate used to place a glyph outline point, for all the rendered yading@10: glyphs. yading@10: It is a positive value, due to the grid's orientation with the Y axis yading@10: upwards. yading@10: .IP "\fBmax_glyph_d, descent\fR" 4 yading@10: .IX Item "max_glyph_d, descent" yading@10: the maximum distance from the baseline to the lowest grid coordinate yading@10: used to place a glyph outline point, for all the rendered glyphs. yading@10: This is a negative value, due to the grid's orientation, with the Y axis yading@10: upwards. yading@10: .IP "\fBmax_glyph_h\fR" 4 yading@10: .IX Item "max_glyph_h" yading@10: maximum glyph height, that is the maximum height for all the glyphs yading@10: contained in the rendered text, it is equivalent to \fIascent\fR \- yading@10: \&\fIdescent\fR. yading@10: .IP "\fBmax_glyph_w\fR" 4 yading@10: .IX Item "max_glyph_w" yading@10: maximum glyph width, that is the maximum width for all the glyphs yading@10: contained in the rendered text yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: the number of input frame, starting from 0 yading@10: .IP "\fBrand(min, max)\fR" 4 yading@10: .IX Item "rand(min, max)" yading@10: return a random number included between \fImin\fR and \fImax\fR yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: input sample aspect ratio yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: timestamp expressed in seconds, \s-1NAN\s0 if the input timestamp is unknown yading@10: .IP "\fBtext_h, th\fR" 4 yading@10: .IX Item "text_h, th" yading@10: the height of the rendered text yading@10: .IP "\fBtext_w, tw\fR" 4 yading@10: .IX Item "text_w, tw" yading@10: the width of the rendered text yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: the x and y offset coordinates where the text is drawn. yading@10: .Sp yading@10: These parameters allow the \fIx\fR and \fIy\fR expressions to refer yading@10: each other, so you can for example specify \f(CW\*(C`y=x/dar\*(C'\fR. yading@10: .PP yading@10: If libavfilter was built with \f(CW\*(C`\-\-enable\-fontconfig\*(C'\fR, then yading@10: \&\fBfontfile\fR can be a fontconfig pattern or omitted. yading@10: .PP yading@10: \fIText expansion\fR yading@10: .IX Subsection "Text expansion" yading@10: .PP yading@10: If \fBexpansion\fR is set to \f(CW\*(C`strftime\*(C'\fR, yading@10: the filter recognizes \fIstrftime()\fR sequences in the provided text and yading@10: expands them accordingly. Check the documentation of \fIstrftime()\fR. This yading@10: feature is deprecated. yading@10: .PP yading@10: If \fBexpansion\fR is set to \f(CW\*(C`none\*(C'\fR, the text is printed verbatim. yading@10: .PP yading@10: If \fBexpansion\fR is set to \f(CW\*(C`normal\*(C'\fR (which is the default), yading@10: the following expansion mechanism is used. yading@10: .PP yading@10: The backslash character '\e', followed by any character, always expands to yading@10: the second character. yading@10: .PP yading@10: Sequence of the form \f(CW\*(C`%{...}\*(C'\fR are expanded. The text between the yading@10: braces is a function name, possibly followed by arguments separated by ':'. yading@10: If the arguments contain special characters or delimiters (':' or '}'), yading@10: they should be escaped. yading@10: .PP yading@10: Note that they probably must also be escaped as the value for the yading@10: \&\fBtext\fR option in the filter argument string and as the filter yading@10: argument in the filtergraph description, and possibly also for the shell, yading@10: that makes up to four levels of escaping; using a text file avoids these yading@10: problems. yading@10: .PP yading@10: The following functions are available: yading@10: .IP "\fBexpr, e\fR" 4 yading@10: .IX Item "expr, e" yading@10: The expression evaluation result. yading@10: .Sp yading@10: It must take one argument specifying the expression to be evaluated, yading@10: which accepts the same constants and functions as the \fIx\fR and yading@10: \&\fIy\fR values. Note that not all constants should be used, for yading@10: example the text size is not known when evaluating the expression, so yading@10: the constants \fItext_w\fR and \fItext_h\fR will have an undefined yading@10: value. yading@10: .IP "\fBgmtime\fR" 4 yading@10: .IX Item "gmtime" yading@10: The time at which the filter is running, expressed in \s-1UTC\s0. yading@10: It can accept an argument: a \fIstrftime()\fR format string. yading@10: .IP "\fBlocaltime\fR" 4 yading@10: .IX Item "localtime" yading@10: The time at which the filter is running, expressed in the local time zone. yading@10: It can accept an argument: a \fIstrftime()\fR format string. yading@10: .IP "\fBn, frame_num\fR" 4 yading@10: .IX Item "n, frame_num" yading@10: The frame number, starting from 0. yading@10: .IP "\fBpts\fR" 4 yading@10: .IX Item "pts" yading@10: The timestamp of the current frame, in seconds, with microsecond accuracy. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Draw \*(L"Test Text\*(R" with font FreeSerif, using the default values for the yading@10: optional parameters. yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text=\*(AqTest Text\*(Aq" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Draw 'Test Text' with font FreeSerif of size 24 at position x=100 yading@10: and y=50 (counting from the top-left corner of the screen), text is yading@10: yellow with a red box around it. Both the text and the box have an yading@10: opacity of 20%. yading@10: .Sp yading@10: .Vb 2 yading@10: \& drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text=\*(AqTest Text\*(Aq:\e yading@10: \& x=100: y=50: fontsize=24: fontcolor=yellow@0.2: box=1: boxcolor=red@0.2" yading@10: .Ve yading@10: .Sp yading@10: Note that the double quotes are not necessary if spaces are not used yading@10: within the parameter list. yading@10: .IP "\(bu" 4 yading@10: Show the text at the center of the video frame: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontsize=30:fontfile=FreeSerif.ttf:text=\*(Aqhello world\*(Aq:x=(w\-text_w)/2:y=(h\-text_h\-line_h)/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Show a text line sliding from right to left in the last row of the video yading@10: frame. The file \fI\s-1LONG_LINE\s0\fR is assumed to contain a single line yading@10: with no newlines. yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontsize=15:fontfile=FreeSerif.ttf:text=LONG_LINE:y=h\-line_h:x=\-50*t" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Show the content of file \fI\s-1CREDITS\s0\fR off the bottom of the frame and scroll up. yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontsize=20:fontfile=FreeSerif.ttf:textfile=CREDITS:y=h\-20*t" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Draw a single green letter \*(L"g\*(R", at the center of the input video. yading@10: The glyph baseline is placed at half screen height. yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w\-max_glyph_w)/2:y=h/2\-ascent" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Show text for 1 second every 3 seconds: yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:draw=lt(mod(t\e,3)\e,1):text=\*(Aqblink\*(Aq" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Use fontconfig to set the font. Note that the colons need to be escaped. yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext=\*(Aqfontfile=Linux Libertine O\-40\e:style=Semibold:text=FFmpeg\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Print the date of a real-time encoding (see \fIstrftime\fR\|(3)): yading@10: .Sp yading@10: .Vb 1 yading@10: \& drawtext=\*(Aqfontfile=FreeSans.ttf:text=%{localtime:%a %b %d %Y}\*(Aq yading@10: .Ve yading@10: .PP yading@10: For more information about libfreetype, check: yading@10: <\fBhttp://www.freetype.org/\fR>. yading@10: .PP yading@10: For more information about fontconfig, check: yading@10: <\fBhttp://freedesktop.org/software/fontconfig/fontconfig\-user.html\fR>. yading@10: .SS "edgedetect" yading@10: .IX Subsection "edgedetect" yading@10: Detect and draw edges. The filter uses the Canny Edge Detection algorithm. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBlow, high\fR" 4 yading@10: .IX Item "low, high" yading@10: Set low and high threshold values used by the Canny thresholding yading@10: algorithm. yading@10: .Sp yading@10: The high threshold selects the \*(L"strong\*(R" edge pixels, which are then yading@10: connected through 8\-connectivity with the \*(L"weak\*(R" edge pixels selected yading@10: by the low threshold. yading@10: .Sp yading@10: \&\fIlow\fR and \fIhigh\fR threshold values must be choosen in the range yading@10: [0,1], and \fIlow\fR should be lesser or equal to \fIhigh\fR. yading@10: .Sp yading@10: Default value for \fIlow\fR is \f(CW\*(C`20/255\*(C'\fR, and default value for \fIhigh\fR yading@10: is \f(CW\*(C`50/255\*(C'\fR. yading@10: .PP yading@10: Example: yading@10: .PP yading@10: .Vb 1 yading@10: \& edgedetect=low=0.1:high=0.4 yading@10: .Ve yading@10: .SS "fade" yading@10: .IX Subsection "fade" yading@10: Apply fade\-in/out effect to input video. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBtype, t\fR" 4 yading@10: .IX Item "type, t" yading@10: The effect type \*(-- can be either \*(L"in\*(R" for fade-in, or \*(L"out\*(R" for a fade-out yading@10: effect. yading@10: Default is \f(CW\*(C`in\*(C'\fR. yading@10: .IP "\fBstart_frame, s\fR" 4 yading@10: .IX Item "start_frame, s" yading@10: Specify the number of the start frame for starting to apply the fade yading@10: effect. Default is 0. yading@10: .IP "\fBnb_frames, n\fR" 4 yading@10: .IX Item "nb_frames, n" yading@10: The number of frames for which the fade effect has to last. At the end of the yading@10: fade-in effect the output video will have the same intensity as the input video, yading@10: at the end of the fade-out transition the output video will be completely black. yading@10: Default is 25. yading@10: .IP "\fBalpha\fR" 4 yading@10: .IX Item "alpha" yading@10: If set to 1, fade only alpha channel, if one exists on the input. yading@10: Default value is 0. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Fade in first 30 frames of video: yading@10: .Sp yading@10: .Vb 1 yading@10: \& fade=in:0:30 yading@10: .Ve yading@10: .Sp yading@10: The command above is equivalent to: yading@10: .Sp yading@10: .Vb 1 yading@10: \& fade=t=in:s=0:n=30 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Fade out last 45 frames of a 200\-frame video: yading@10: .Sp yading@10: .Vb 2 yading@10: \& fade=out:155:45 yading@10: \& fade=type=out:start_frame=155:nb_frames=45 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Fade in first 25 frames and fade out last 25 frames of a 1000\-frame video: yading@10: .Sp yading@10: .Vb 1 yading@10: \& fade=in:0:25, fade=out:975:25 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Make first 5 frames black, then fade in from frame 5\-24: yading@10: .Sp yading@10: .Vb 1 yading@10: \& fade=in:5:20 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Fade in alpha over first 25 frames of video: yading@10: .Sp yading@10: .Vb 1 yading@10: \& fade=in:0:25:alpha=1 yading@10: .Ve yading@10: .SS "field" yading@10: .IX Subsection "field" yading@10: Extract a single field from an interlaced image using stride yading@10: arithmetic to avoid wasting \s-1CPU\s0 time. The output frames are marked as yading@10: non-interlaced. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBtype\fR" 4 yading@10: .IX Item "type" yading@10: Specify whether to extract the top (if the value is \f(CW0\fR or yading@10: \&\f(CW\*(C`top\*(C'\fR) or the bottom field (if the value is \f(CW1\fR or yading@10: \&\f(CW\*(C`bottom\*(C'\fR). yading@10: .SS "fieldmatch" yading@10: .IX Subsection "fieldmatch" yading@10: Field matching filter for inverse telecine. It is meant to reconstruct the yading@10: progressive frames from a telecined stream. The filter does not drop duplicated yading@10: frames, so to achieve a complete inverse telecine \f(CW\*(C`fieldmatch\*(C'\fR needs to be yading@10: followed by a decimation filter such as decimate in the filtergraph. yading@10: .PP yading@10: The separation of the field matching and the decimation is notably motivated by yading@10: the possibility of inserting a de-interlacing filter fallback between the two. yading@10: If the source has mixed telecined and real interlaced content, yading@10: \&\f(CW\*(C`fieldmatch\*(C'\fR will not be able to match fields for the interlaced parts. yading@10: But these remaining combed frames will be marked as interlaced, and thus can be yading@10: de-interlaced by a later filter such as yadif before decimation. yading@10: .PP yading@10: In addition to the various configuration options, \f(CW\*(C`fieldmatch\*(C'\fR can take an yading@10: optional second stream, activated through the \fBppsrc\fR option. If yading@10: enabled, the frames reconstruction will be based on the fields and frames from yading@10: this second stream. This allows the first input to be pre-processed in order to yading@10: help the various algorithms of the filter, while keeping the output lossless yading@10: (assuming the fields are matched properly). Typically, a field-aware denoiser, yading@10: or brightness/contrast adjustments can help. yading@10: .PP yading@10: Note that this filter uses the same algorithms as \s-1TIVTC/TFM\s0 (AviSynth project) yading@10: and \s-1VIVTC/VFM\s0 (VapourSynth project). The later is a light clone of \s-1TFM\s0 from yading@10: which \f(CW\*(C`fieldmatch\*(C'\fR is based on. While the semantic and usage are very yading@10: close, some behaviour and options names can differ. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBorder\fR" 4 yading@10: .IX Item "order" yading@10: Specify the assumed field order of the input stream. Available values are: yading@10: .RS 4 yading@10: .IP "\fBauto\fR" 4 yading@10: .IX Item "auto" yading@10: Auto detect parity (use FFmpeg's internal parity value). yading@10: .IP "\fBbff\fR" 4 yading@10: .IX Item "bff" yading@10: Assume bottom field first. yading@10: .IP "\fBtff\fR" 4 yading@10: .IX Item "tff" yading@10: Assume top field first. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Note that it is sometimes recommended not to trust the parity announced by the yading@10: stream. yading@10: .Sp yading@10: Default value is \fIauto\fR. yading@10: .RE yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Set the matching mode or strategy to use. \fBpc\fR mode is the safest in the yading@10: sense that it wont risk creating jerkiness due to duplicate frames when yading@10: possible, but if there are bad edits or blended fields it will end up yading@10: outputting combed frames when a good match might actually exist. On the other yading@10: hand, \fBpcn_ub\fR mode is the most risky in terms of creating jerkiness, yading@10: but will almost always find a good frame if there is one. The other values are yading@10: all somewhere in between \fBpc\fR and \fBpcn_ub\fR in terms of risking yading@10: jerkiness and creating duplicate frames versus finding good matches in sections yading@10: with bad edits, orphaned fields, blended fields, etc. yading@10: .Sp yading@10: More details about p/c/n/u/b are available in p/c/n/u/b meaning section. yading@10: .Sp yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBpc\fR" 4 yading@10: .IX Item "pc" yading@10: 2\-way matching (p/c) yading@10: .IP "\fBpc_n\fR" 4 yading@10: .IX Item "pc_n" yading@10: 2\-way matching, and trying 3rd match if still combed (p/c + n) yading@10: .IP "\fBpc_u\fR" 4 yading@10: .IX Item "pc_u" yading@10: 2\-way matching, and trying 3rd match (same order) if still combed (p/c + u) yading@10: .IP "\fBpc_n_ub\fR" 4 yading@10: .IX Item "pc_n_ub" yading@10: 2\-way matching, trying 3rd match if still combed, and trying 4th/5th matches if yading@10: still combed (p/c + n + u/b) yading@10: .IP "\fBpcn\fR" 4 yading@10: .IX Item "pcn" yading@10: 3\-way matching (p/c/n) yading@10: .IP "\fBpcn_ub\fR" 4 yading@10: .IX Item "pcn_ub" yading@10: 3\-way matching, and trying 4th/5th matches if all 3 of the original matches are yading@10: detected as combed (p/c/n + u/b) yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: The parenthesis at the end indicate the matches that would be used for that yading@10: mode assuming \fBorder\fR=\fItff\fR (and \fBfield\fR on \fIauto\fR or yading@10: \&\fItop\fR). yading@10: .Sp yading@10: In terms of speed \fBpc\fR mode is by far the fastest and \fBpcn_ub\fR is yading@10: the slowest. yading@10: .Sp yading@10: Default value is \fIpc_n\fR. yading@10: .RE yading@10: .IP "\fBppsrc\fR" 4 yading@10: .IX Item "ppsrc" yading@10: Mark the main input stream as a pre-processed input, and enable the secondary yading@10: input stream as the clean source to pick the fields from. See the filter yading@10: introduction for more details. It is similar to the \fBclip2\fR feature from yading@10: \&\s-1VFM/TFM\s0. yading@10: .Sp yading@10: Default value is \f(CW0\fR (disabled). yading@10: .IP "\fBfield\fR" 4 yading@10: .IX Item "field" yading@10: Set the field to match from. It is recommended to set this to the same value as yading@10: \&\fBorder\fR unless you experience matching failures with that setting. In yading@10: certain circumstances changing the field that is used to match from can have a yading@10: large impact on matching performance. Available values are: yading@10: .RS 4 yading@10: .IP "\fBauto\fR" 4 yading@10: .IX Item "auto" yading@10: Automatic (same value as \fBorder\fR). yading@10: .IP "\fBbottom\fR" 4 yading@10: .IX Item "bottom" yading@10: Match from the bottom field. yading@10: .IP "\fBtop\fR" 4 yading@10: .IX Item "top" yading@10: Match from the top field. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fIauto\fR. yading@10: .RE yading@10: .IP "\fBmchroma\fR" 4 yading@10: .IX Item "mchroma" yading@10: Set whether or not chroma is included during the match comparisons. In most yading@10: cases it is recommended to leave this enabled. You should set this to \f(CW0\fR yading@10: only if your clip has bad chroma problems such as heavy rainbowing or other yading@10: artifacts. Setting this to \f(CW0\fR could also be used to speed things up at yading@10: the cost of some accuracy. yading@10: .Sp yading@10: Default value is \f(CW1\fR. yading@10: .IP "\fBy0\fR" 4 yading@10: .IX Item "y0" yading@10: .PD 0 yading@10: .IP "\fBy1\fR" 4 yading@10: .IX Item "y1" yading@10: .PD yading@10: These define an exclusion band which excludes the lines between \fBy0\fR and yading@10: \&\fBy1\fR from being included in the field matching decision. An exclusion yading@10: band can be used to ignore subtitles, a logo, or other things that may yading@10: interfere with the matching. \fBy0\fR sets the starting scan line and yading@10: \&\fBy1\fR sets the ending line; all lines in between \fBy0\fR and yading@10: \&\fBy1\fR (including \fBy0\fR and \fBy1\fR) will be ignored. Setting yading@10: \&\fBy0\fR and \fBy1\fR to the same value will disable the feature. yading@10: \&\fBy0\fR and \fBy1\fR defaults to \f(CW0\fR. yading@10: .IP "\fBscthresh\fR" 4 yading@10: .IX Item "scthresh" yading@10: Set the scene change detection threshold as a percentage of maximum change on yading@10: the luma plane. Good values are in the \f(CW\*(C`[8.0, 14.0]\*(C'\fR range. Scene change yading@10: detection is only relevant in case \fBcombmatch\fR=\fIsc\fR. The range for yading@10: \&\fBscthresh\fR is \f(CW\*(C`[0.0, 100.0]\*(C'\fR. yading@10: .Sp yading@10: Default value is \f(CW12.0\fR. yading@10: .IP "\fBcombmatch\fR" 4 yading@10: .IX Item "combmatch" yading@10: When \fBcombatch\fR is not \fInone\fR, \f(CW\*(C`fieldmatch\*(C'\fR will take into yading@10: account the combed scores of matches when deciding what match to use as the yading@10: final match. Available values are: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: No final matching based on combed scores. yading@10: .IP "\fBsc\fR" 4 yading@10: .IX Item "sc" yading@10: Combed scores are only used when a scene change is detected. yading@10: .IP "\fBfull\fR" 4 yading@10: .IX Item "full" yading@10: Use combed scores all the time. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default is \fIsc\fR. yading@10: .RE yading@10: .IP "\fBcombdbg\fR" 4 yading@10: .IX Item "combdbg" yading@10: Force \f(CW\*(C`fieldmatch\*(C'\fR to calculate the combed metrics for certain matches and yading@10: print them. This setting is known as \fBmicout\fR in \s-1TFM/VFM\s0 vocabulary. yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: No forced calculation. yading@10: .IP "\fBpcn\fR" 4 yading@10: .IX Item "pcn" yading@10: Force p/c/n calculations. yading@10: .IP "\fBpcnub\fR" 4 yading@10: .IX Item "pcnub" yading@10: Force p/c/n/u/b calculations. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fInone\fR. yading@10: .RE yading@10: .IP "\fBcthresh\fR" 4 yading@10: .IX Item "cthresh" yading@10: This is the area combing threshold used for combed frame detection. This yading@10: essentially controls how \*(L"strong\*(R" or \*(L"visible\*(R" combing must be to be detected. yading@10: Larger values mean combing must be more visible and smaller values mean combing yading@10: can be less visible or strong and still be detected. Valid settings are from yading@10: \&\f(CW\*(C`\-1\*(C'\fR (every pixel will be detected as combed) to \f(CW255\fR (no pixel will yading@10: be detected as combed). This is basically a pixel difference value. A good yading@10: range is \f(CW\*(C`[8, 12]\*(C'\fR. yading@10: .Sp yading@10: Default value is \f(CW9\fR. yading@10: .IP "\fBchroma\fR" 4 yading@10: .IX Item "chroma" yading@10: Sets whether or not chroma is considered in the combed frame decision. Only yading@10: disable this if your source has chroma problems (rainbowing, etc.) that are yading@10: causing problems for the combed frame detection with chroma enabled. Actually, yading@10: using \fBchroma\fR=\fI0\fR is usually more reliable, except for the case yading@10: where there is chroma only combing in the source. yading@10: .Sp yading@10: Default value is \f(CW0\fR. yading@10: .IP "\fBblockx\fR" 4 yading@10: .IX Item "blockx" yading@10: .PD 0 yading@10: .IP "\fBblocky\fR" 4 yading@10: .IX Item "blocky" yading@10: .PD yading@10: Respectively set the x\-axis and y\-axis size of the window used during combed yading@10: frame detection. This has to do with the size of the area in which yading@10: \&\fBcombpel\fR pixels are required to be detected as combed for a frame to be yading@10: declared combed. See the \fBcombpel\fR parameter description for more info. yading@10: Possible values are any number that is a power of 2 starting at 4 and going up yading@10: to 512. yading@10: .Sp yading@10: Default value is \f(CW16\fR. yading@10: .IP "\fBcombpel\fR" 4 yading@10: .IX Item "combpel" yading@10: The number of combed pixels inside any of the \fBblocky\fR by yading@10: \&\fBblockx\fR size blocks on the frame for the frame to be detected as yading@10: combed. While \fBcthresh\fR controls how \*(L"visible\*(R" the combing must be, this yading@10: setting controls \*(L"how much\*(R" combing there must be in any localized area (a yading@10: window defined by the \fBblockx\fR and \fBblocky\fR settings) on the yading@10: frame. Minimum value is \f(CW0\fR and maximum is \f(CW\*(C`blocky x blockx\*(C'\fR (at yading@10: which point no frames will ever be detected as combed). This setting is known yading@10: as \fB\s-1MI\s0\fR in \s-1TFM/VFM\s0 vocabulary. yading@10: .Sp yading@10: Default value is \f(CW80\fR. yading@10: .PP yading@10: \fIp/c/n/u/b meaning\fR yading@10: .IX Subsection "p/c/n/u/b meaning" yading@10: .PP yading@10: p/c/n yading@10: .IX Subsection "p/c/n" yading@10: .PP yading@10: We assume the following telecined stream: yading@10: .PP yading@10: .Vb 2 yading@10: \& Top fields: 1 2 2 3 4 yading@10: \& Bottom fields: 1 2 3 4 4 yading@10: .Ve yading@10: .PP yading@10: The numbers correspond to the progressive frame the fields relate to. Here, the yading@10: first two frames are progressive, the 3rd and 4th are combed, and so on. yading@10: .PP yading@10: When \f(CW\*(C`fieldmatch\*(C'\fR is configured to run a matching from bottom yading@10: (\fBfield\fR=\fIbottom\fR) this is how this input stream get transformed: yading@10: .PP yading@10: .Vb 3 yading@10: \& Input stream: yading@10: \& T 1 2 2 3 4 yading@10: \& B 1 2 3 4 4 <\-\- matching reference yading@10: \& yading@10: \& Matches: c c n n c yading@10: \& yading@10: \& Output stream: yading@10: \& T 1 2 3 4 4 yading@10: \& B 1 2 3 4 4 yading@10: .Ve yading@10: .PP yading@10: As a result of the field matching, we can see that some frames get duplicated. yading@10: To perform a complete inverse telecine, you need to rely on a decimation filter yading@10: after this operation. See for instance the decimate filter. yading@10: .PP yading@10: The same operation now matching from top fields (\fBfield\fR=\fItop\fR) yading@10: looks like this: yading@10: .PP yading@10: .Vb 3 yading@10: \& Input stream: yading@10: \& T 1 2 2 3 4 <\-\- matching reference yading@10: \& B 1 2 3 4 4 yading@10: \& yading@10: \& Matches: c c p p c yading@10: \& yading@10: \& Output stream: yading@10: \& T 1 2 2 3 4 yading@10: \& B 1 2 2 3 4 yading@10: .Ve yading@10: .PP yading@10: In these examples, we can see what \fIp\fR, \fIc\fR and \fIn\fR mean; yading@10: basically, they refer to the frame and field of the opposite parity: yading@10: .IP "*<\fIp\fR matches the field of the opposite parity in the previous frame>" 4 yading@10: .IX Item "*

" yading@10: .PD 0 yading@10: .IP "*<\fIc\fR matches the field of the opposite parity in the current frame>" 4 yading@10: .IX Item "*" yading@10: .IP "*<\fIn\fR matches the field of the opposite parity in the next frame>" 4 yading@10: .IX Item "*" yading@10: .PD yading@10: .PP yading@10: u/b yading@10: .IX Subsection "u/b" yading@10: .PP yading@10: The \fIu\fR and \fIb\fR matching are a bit special in the sense that they match yading@10: from the opposite parity flag. In the following examples, we assume that we are yading@10: currently matching the 2nd frame (Top:2, bottom:2). According to the match, a yading@10: \&'x' is placed above and below each matched fields. yading@10: .PP yading@10: With bottom matching (\fBfield\fR=\fIbottom\fR): yading@10: .PP yading@10: .Vb 1 yading@10: \& Match: c p n b u yading@10: \& yading@10: \& x x x x x yading@10: \& Top 1 2 2 1 2 2 1 2 2 1 2 2 1 2 2 yading@10: \& Bottom 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 yading@10: \& x x x x x yading@10: \& yading@10: \& Output frames: yading@10: \& 2 1 2 2 2 yading@10: \& 2 2 2 1 3 yading@10: .Ve yading@10: .PP yading@10: With top matching (\fBfield\fR=\fItop\fR): yading@10: .PP yading@10: .Vb 1 yading@10: \& Match: c p n b u yading@10: \& yading@10: \& x x x x x yading@10: \& Top 1 2 2 1 2 2 1 2 2 1 2 2 1 2 2 yading@10: \& Bottom 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 yading@10: \& x x x x x yading@10: \& yading@10: \& Output frames: yading@10: \& 2 2 2 1 2 yading@10: \& 2 1 3 2 2 yading@10: .Ve yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .PP yading@10: Simple \s-1IVTC\s0 of a top field first telecined stream: yading@10: .PP yading@10: .Vb 1 yading@10: \& fieldmatch=order=tff:combmatch=none, decimate yading@10: .Ve yading@10: .PP yading@10: Advanced \s-1IVTC\s0, with fallback on yadif for still combed frames: yading@10: .PP yading@10: .Vb 1 yading@10: \& fieldmatch=order=tff:combmatch=full, yadif=deint=interlaced, decimate yading@10: .Ve yading@10: .SS "fieldorder" yading@10: .IX Subsection "fieldorder" yading@10: Transform the field order of the input video. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBorder\fR" 4 yading@10: .IX Item "order" yading@10: Output field order. Valid values are \fItff\fR for top field first or \fIbff\fR yading@10: for bottom field first. yading@10: .PP yading@10: Default value is \fBtff\fR. yading@10: .PP yading@10: Transformation is achieved by shifting the picture content up or down yading@10: by one line, and filling the remaining line with appropriate picture content. yading@10: This method is consistent with most broadcast field order converters. yading@10: .PP yading@10: If the input video is not flagged as being interlaced, or it is already yading@10: flagged as being of the required output field order then this filter does yading@10: not alter the incoming video. yading@10: .PP yading@10: This filter is very useful when converting to or from \s-1PAL\s0 \s-1DV\s0 material, yading@10: which is bottom field first. yading@10: .PP yading@10: For example: yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.vob \-vf "fieldorder=bff" out.dv yading@10: .Ve yading@10: .SS "fifo" yading@10: .IX Subsection "fifo" yading@10: Buffer input images and send them when they are requested. yading@10: .PP yading@10: This filter is mainly useful when auto-inserted by the libavfilter yading@10: framework. yading@10: .PP yading@10: The filter does not take parameters. yading@10: .SS "format" yading@10: .IX Subsection "format" yading@10: Convert the input video to one of the specified pixel formats. yading@10: Libavfilter will try to pick one that is supported for the input to yading@10: the next filter. yading@10: .PP yading@10: This filter accepts the following parameters: yading@10: .IP "\fBpix_fmts\fR" 4 yading@10: .IX Item "pix_fmts" yading@10: A '|'\-separated list of pixel format names, for example yading@10: \&\*(L"pix_fmts=yuv420p|monow|rgb24\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Convert the input video to the format \fIyuv420p\fR yading@10: .Sp yading@10: .Vb 1 yading@10: \& format=pix_fmts=yuv420p yading@10: .Ve yading@10: .Sp yading@10: Convert the input video to any of the formats in the list yading@10: .Sp yading@10: .Vb 1 yading@10: \& format=pix_fmts=yuv420p|yuv444p|yuv410p yading@10: .Ve yading@10: .SS "fps" yading@10: .IX Subsection "fps" yading@10: Convert the video to specified constant frame rate by duplicating or dropping yading@10: frames as necessary. yading@10: .PP yading@10: This filter accepts the following named parameters: yading@10: .IP "\fBfps\fR" 4 yading@10: .IX Item "fps" yading@10: Desired output frame rate. The default is \f(CW25\fR. yading@10: .IP "\fBround\fR" 4 yading@10: .IX Item "round" yading@10: Rounding method. yading@10: .Sp yading@10: Possible values are: yading@10: .RS 4 yading@10: .IP "\fBzero\fR" 4 yading@10: .IX Item "zero" yading@10: zero round towards 0 yading@10: .IP "\fBinf\fR" 4 yading@10: .IX Item "inf" yading@10: round away from 0 yading@10: .IP "\fBdown\fR" 4 yading@10: .IX Item "down" yading@10: round towards \-infinity yading@10: .IP "\fBup\fR" 4 yading@10: .IX Item "up" yading@10: round towards +infinity yading@10: .IP "\fBnear\fR" 4 yading@10: .IX Item "near" yading@10: round to nearest yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: The default is \f(CW\*(C`near\*(C'\fR. yading@10: .RE yading@10: .PP yading@10: Alternatively, the options can be specified as a flat string: yading@10: \&\fIfps\fR[:\fIround\fR]. yading@10: .PP yading@10: See also the setpts filter. yading@10: .SS "framestep" yading@10: .IX Subsection "framestep" yading@10: Select one frame every N\-th frame. yading@10: .PP yading@10: This filter accepts the following option: yading@10: .IP "\fBstep\fR" 4 yading@10: .IX Item "step" yading@10: Select frame after every \f(CW\*(C`step\*(C'\fR frames. yading@10: Allowed values are positive integers higher than 0. Default value is \f(CW1\fR. yading@10: .SS "frei0r" yading@10: .IX Subsection "frei0r" yading@10: Apply a frei0r effect to the input video. yading@10: .PP yading@10: To enable compilation of this filter you need to install the frei0r yading@10: header and configure FFmpeg with \f(CW\*(C`\-\-enable\-frei0r\*(C'\fR. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBfilter_name\fR" 4 yading@10: .IX Item "filter_name" yading@10: The name to the frei0r effect to load. If the environment variable yading@10: \&\fB\s-1FREI0R_PATH\s0\fR is defined, the frei0r effect is searched in each one of the yading@10: directories specified by the colon separated list in \fB\s-1FREIOR_PATH\s0\fR, yading@10: otherwise in the standard frei0r paths, which are in this order: yading@10: \&\fI\s-1HOME/\s0.frei0r\-1/lib/\fR, \fI/usr/local/lib/frei0r\-1/\fR, yading@10: \&\fI/usr/lib/frei0r\-1/\fR. yading@10: .IP "\fBfilter_params\fR" 4 yading@10: .IX Item "filter_params" yading@10: A '|'\-separated list of parameters to pass to the frei0r effect. yading@10: .PP yading@10: A frei0r effect parameter can be a boolean (whose values are specified yading@10: with \*(L"y\*(R" and \*(L"n\*(R"), a double, a color (specified by the syntax yading@10: \&\fIR\fR/\fIG\fR/\fIB\fR, \fIR\fR, \fIG\fR, and \fIB\fR being float yading@10: numbers from 0.0 to 1.0) or by an \f(CW\*(C`av_parse_color()\*(C'\fR color yading@10: description), a position (specified by the syntax \fIX\fR/\fIY\fR, yading@10: \&\fIX\fR and \fIY\fR being float numbers) and a string. yading@10: .PP yading@10: The number and kind of parameters depend on the loaded effect. If an yading@10: effect parameter is not specified the default value is set. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply the distort0r effect, set the first two double parameters: yading@10: .Sp yading@10: .Vb 1 yading@10: \& frei0r=filter_name=distort0r:filter_params=0.5|0.01 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply the colordistance effect, take a color as first parameter: yading@10: .Sp yading@10: .Vb 3 yading@10: \& frei0r=colordistance:0.2/0.3/0.4 yading@10: \& frei0r=colordistance:violet yading@10: \& frei0r=colordistance:0x112233 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply the perspective effect, specify the top left and top right image yading@10: positions: yading@10: .Sp yading@10: .Vb 1 yading@10: \& frei0r=perspective:0.2/0.2|0.8/0.2 yading@10: .Ve yading@10: .PP yading@10: For more information see: yading@10: <\fBhttp://frei0r.dyne.org\fR> yading@10: .SS "geq" yading@10: .IX Subsection "geq" yading@10: The filter accepts the following options: yading@10: .IP "\fBlum_expr\fR" 4 yading@10: .IX Item "lum_expr" yading@10: the luminance expression yading@10: .IP "\fBcb_expr\fR" 4 yading@10: .IX Item "cb_expr" yading@10: the chrominance blue expression yading@10: .IP "\fBcr_expr\fR" 4 yading@10: .IX Item "cr_expr" yading@10: the chrominance red expression yading@10: .IP "\fBalpha_expr\fR" 4 yading@10: .IX Item "alpha_expr" yading@10: the alpha expression yading@10: .PP yading@10: If one of the chrominance expression is not defined, it falls back on the other yading@10: one. If no alpha expression is specified it will evaluate to opaque value. yading@10: If none of chrominance expressions are yading@10: specified, they will evaluate the luminance expression. yading@10: .PP yading@10: The expressions can use the following variables and functions: yading@10: .IP "\fBN\fR" 4 yading@10: .IX Item "N" yading@10: The sequential number of the filtered frame, starting from \f(CW0\fR. yading@10: .IP "\fBX\fR" 4 yading@10: .IX Item "X" yading@10: .PD 0 yading@10: .IP "\fBY\fR" 4 yading@10: .IX Item "Y" yading@10: .PD yading@10: The coordinates of the current sample. yading@10: .IP "\fBW\fR" 4 yading@10: .IX Item "W" yading@10: .PD 0 yading@10: .IP "\fBH\fR" 4 yading@10: .IX Item "H" yading@10: .PD yading@10: The width and height of the image. yading@10: .IP "\fB\s-1SW\s0\fR" 4 yading@10: .IX Item "SW" yading@10: .PD 0 yading@10: .IP "\fB\s-1SH\s0\fR" 4 yading@10: .IX Item "SH" yading@10: .PD yading@10: Width and height scale depending on the currently filtered plane. It is the yading@10: ratio between the corresponding luma plane number of pixels and the current yading@10: plane ones. E.g. for \s-1YUV4:2:0\s0 the values are \f(CW\*(C`1,1\*(C'\fR for the luma plane, and yading@10: \&\f(CW\*(C`0.5,0.5\*(C'\fR for chroma planes. yading@10: .IP "\fBT\fR" 4 yading@10: .IX Item "T" yading@10: Time of the current frame, expressed in seconds. yading@10: .IP "\fBp(x, y)\fR" 4 yading@10: .IX Item "p(x, y)" yading@10: Return the value of the pixel at location (\fIx\fR,\fIy\fR) of the current yading@10: plane. yading@10: .IP "\fBlum(x, y)\fR" 4 yading@10: .IX Item "lum(x, y)" yading@10: Return the value of the pixel at location (\fIx\fR,\fIy\fR) of the luminance yading@10: plane. yading@10: .IP "\fBcb(x, y)\fR" 4 yading@10: .IX Item "cb(x, y)" yading@10: Return the value of the pixel at location (\fIx\fR,\fIy\fR) of the yading@10: blue-difference chroma plane. Returns 0 if there is no such plane. yading@10: .IP "\fBcr(x, y)\fR" 4 yading@10: .IX Item "cr(x, y)" yading@10: Return the value of the pixel at location (\fIx\fR,\fIy\fR) of the yading@10: red-difference chroma plane. Returns 0 if there is no such plane. yading@10: .IP "\fBalpha(x, y)\fR" 4 yading@10: .IX Item "alpha(x, y)" yading@10: Return the value of the pixel at location (\fIx\fR,\fIy\fR) of the alpha yading@10: plane. Returns 0 if there is no such plane. yading@10: .PP yading@10: For functions, if \fIx\fR and \fIy\fR are outside the area, the value will be yading@10: automatically clipped to the closer edge. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Flip the image horizontally: yading@10: .Sp yading@10: .Vb 1 yading@10: \& geq=p(W\-X\e,Y) yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a bidimensional sine wave, with angle \f(CW\*(C`PI/3\*(C'\fR and a yading@10: wavelength of 100 pixels: yading@10: .Sp yading@10: .Vb 1 yading@10: \& geq=128 + 100*sin(2*(PI/100)*(cos(PI/3)*(X\-50*T) + sin(PI/3)*Y)):128:128 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a fancy enigmatic moving light: yading@10: .Sp yading@10: .Vb 1 yading@10: \& nullsrc=s=256x256,geq=random(1)/hypot(X\-cos(N*0.07)*W/2\-W/2\e,Y\-sin(N*0.09)*H/2\-H/2)^2*1000000*sin(N*0.02):128:128 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a quick emboss effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& format=gray,geq=lum_expr=\*(Aq(p(X,Y)+(256\-p(X\-4,Y\-4)))/2\*(Aq yading@10: .Ve yading@10: .SS "gradfun" yading@10: .IX Subsection "gradfun" yading@10: Fix the banding artifacts that are sometimes introduced into nearly flat yading@10: regions by truncation to 8bit color depth. yading@10: Interpolate the gradients that should go where the bands are, and yading@10: dither them. yading@10: .PP yading@10: This filter is designed for playback only. Do not use it prior to yading@10: lossy compression, because compression tends to lose the dither and yading@10: bring back the bands. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBstrength\fR" 4 yading@10: .IX Item "strength" yading@10: The maximum amount by which the filter will change any one pixel. Also the yading@10: threshold for detecting nearly flat regions. Acceptable values range from .51 to yading@10: 64, default value is 1.2, out-of-range values will be clipped to the valid yading@10: range. yading@10: .IP "\fBradius\fR" 4 yading@10: .IX Item "radius" yading@10: The neighborhood to fit the gradient to. A larger radius makes for smoother yading@10: gradients, but also prevents the filter from modifying the pixels near detailed yading@10: regions. Acceptable values are 8\-32, default value is 16, out-of-range values yading@10: will be clipped to the valid range. yading@10: .PP yading@10: Alternatively, the options can be specified as a flat string: yading@10: \&\fIstrength\fR[:\fIradius\fR] yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply the filter with a \f(CW3.5\fR strength and radius of \f(CW8\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& gradfun=3.5:8 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Specify radius, omitting the strength (which will fall-back to the default yading@10: value): yading@10: .Sp yading@10: .Vb 1 yading@10: \& gradfun=radius=8 yading@10: .Ve yading@10: .SS "hflip" yading@10: .IX Subsection "hflip" yading@10: Flip the input video horizontally. yading@10: .PP yading@10: For example to horizontally flip the input video with \fBffmpeg\fR: yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.avi \-vf "hflip" out.avi yading@10: .Ve yading@10: .SS "histeq" yading@10: .IX Subsection "histeq" yading@10: This filter applies a global color histogram equalization on a yading@10: per-frame basis. yading@10: .PP yading@10: It can be used to correct video that has a compressed range of pixel yading@10: intensities. The filter redistributes the pixel intensities to yading@10: equalize their distribution across the intensity range. It may be yading@10: viewed as an \*(L"automatically adjusting contrast filter\*(R". This filter is yading@10: useful only for correcting degraded or poorly captured source yading@10: video. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBstrength\fR" 4 yading@10: .IX Item "strength" yading@10: Determine the amount of equalization to be applied. As the strength yading@10: is reduced, the distribution of pixel intensities more-and-more yading@10: approaches that of the input frame. The value must be a float number yading@10: in the range [0,1] and defaults to 0.200. yading@10: .IP "\fBintensity\fR" 4 yading@10: .IX Item "intensity" yading@10: Set the maximum intensity that can generated and scale the output yading@10: values appropriately. The strength should be set as desired and then yading@10: the intensity can be limited if needed to avoid washing-out. The value yading@10: must be a float number in the range [0,1] and defaults to 0.210. yading@10: .IP "\fBantibanding\fR" 4 yading@10: .IX Item "antibanding" yading@10: Set the antibanding level. If enabled the filter will randomly vary yading@10: the luminance of output pixels by a small amount to avoid banding of yading@10: the histogram. Possible values are \f(CW\*(C`none\*(C'\fR, \f(CW\*(C`weak\*(C'\fR or yading@10: \&\f(CW\*(C`strong\*(C'\fR. It defaults to \f(CW\*(C`none\*(C'\fR. yading@10: .SS "histogram" yading@10: .IX Subsection "histogram" yading@10: Compute and draw a color distribution histogram for the input video. yading@10: .PP yading@10: The computed histogram is a representation of distribution of color components yading@10: in an image. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Set histogram mode. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBlevels\fR" 4 yading@10: .IX Item "levels" yading@10: standard histogram that display color components distribution in an image. yading@10: Displays color graph for each color component. Shows distribution yading@10: of the Y, U, V, A or G, B, R components, depending on input format, yading@10: in current frame. Bellow each graph is color component scale meter. yading@10: .IP "\fBcolor\fR" 4 yading@10: .IX Item "color" yading@10: chroma values in vectorscope, if brighter more such chroma values are yading@10: distributed in an image. yading@10: Displays chroma values (U/V color placement) in two dimensional graph yading@10: (which is called a vectorscope). It can be used to read of the hue and yading@10: saturation of the current frame. At a same time it is a histogram. yading@10: The whiter a pixel in the vectorscope, the more pixels of the input frame yading@10: correspond to that pixel (that is the more pixels have this chroma value). yading@10: The V component is displayed on the horizontal (X) axis, with the leftmost yading@10: side being V = 0 and the rightmost side being V = 255. yading@10: The U component is displayed on the vertical (Y) axis, with the top yading@10: representing U = 0 and the bottom representing U = 255. yading@10: .Sp yading@10: The position of a white pixel in the graph corresponds to the chroma value yading@10: of a pixel of the input clip. So the graph can be used to read of the yading@10: hue (color flavor) and the saturation (the dominance of the hue in the color). yading@10: As the hue of a color changes, it moves around the square. At the center of yading@10: the square, the saturation is zero, which means that the corresponding pixel yading@10: has no color. If you increase the amount of a specific color, while leaving yading@10: the other colors unchanged, the saturation increases, and you move towards yading@10: the edge of the square. yading@10: .IP "\fBcolor2\fR" 4 yading@10: .IX Item "color2" yading@10: chroma values in vectorscope, similar as \f(CW\*(C`color\*(C'\fR but actual chroma values yading@10: are displayed. yading@10: .IP "\fBwaveform\fR" 4 yading@10: .IX Item "waveform" yading@10: per row/column color component graph. In row mode graph in the left side represents yading@10: color component value 0 and right side represents value = 255. In column mode top yading@10: side represents color component value = 0 and bottom side represents value = 255. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`levels\*(C'\fR. yading@10: .RE yading@10: .IP "\fBlevel_height\fR" 4 yading@10: .IX Item "level_height" yading@10: Set height of level in \f(CW\*(C`levels\*(C'\fR. Default value is \f(CW200\fR. yading@10: Allowed range is [50, 2048]. yading@10: .IP "\fBscale_height\fR" 4 yading@10: .IX Item "scale_height" yading@10: Set height of color scale in \f(CW\*(C`levels\*(C'\fR. Default value is \f(CW12\fR. yading@10: Allowed range is [0, 40]. yading@10: .IP "\fBstep\fR" 4 yading@10: .IX Item "step" yading@10: Set step for \f(CW\*(C`waveform\*(C'\fR mode. Smaller values are useful to find out how much yading@10: of same luminance values across input rows/columns are distributed. yading@10: Default value is \f(CW10\fR. Allowed range is [1, 255]. yading@10: .IP "\fBwaveform_mode\fR" 4 yading@10: .IX Item "waveform_mode" yading@10: Set mode for \f(CW\*(C`waveform\*(C'\fR. Can be either \f(CW\*(C`row\*(C'\fR, or \f(CW\*(C`column\*(C'\fR. yading@10: Default is \f(CW\*(C`row\*(C'\fR. yading@10: .IP "\fBdisplay_mode\fR" 4 yading@10: .IX Item "display_mode" yading@10: Set display mode for \f(CW\*(C`waveform\*(C'\fR and \f(CW\*(C`levels\*(C'\fR. yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBparade\fR" 4 yading@10: .IX Item "parade" yading@10: Display separate graph for the color components side by side in yading@10: \&\f(CW\*(C`row\*(C'\fR waveform mode or one below other in \f(CW\*(C`column\*(C'\fR waveform mode yading@10: for \f(CW\*(C`waveform\*(C'\fR histogram mode. For \f(CW\*(C`levels\*(C'\fR histogram mode yading@10: per color component graphs are placed one bellow other. yading@10: .Sp yading@10: This display mode in \f(CW\*(C`waveform\*(C'\fR histogram mode makes it easy to spot yading@10: color casts in the highlights and shadows of an image, by comparing the yading@10: contours of the top and the bottom of each waveform. yading@10: Since whites, grays, and blacks are characterized by yading@10: exactly equal amounts of red, green, and blue, neutral areas of the yading@10: picture should display three waveforms of roughly equal width/height. yading@10: If not, the correction is easy to make by making adjustments to level the yading@10: three waveforms. yading@10: .IP "\fBoverlay\fR" 4 yading@10: .IX Item "overlay" yading@10: Presents information that's identical to that in the \f(CW\*(C`parade\*(C'\fR, except yading@10: that the graphs representing color components are superimposed directly yading@10: over one another. yading@10: .Sp yading@10: This display mode in \f(CW\*(C`waveform\*(C'\fR histogram mode can make it easier to spot yading@10: the relative differences or similarities in overlapping areas of the color yading@10: components that are supposed to be identical, such as neutral whites, grays, yading@10: or blacks. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default is \f(CW\*(C`parade\*(C'\fR. yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Calculate and draw histogram: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay \-i input \-vf histogram yading@10: .Ve yading@10: .SS "hqdn3d" yading@10: .IX Subsection "hqdn3d" yading@10: High precision/quality 3d denoise filter. This filter aims to reduce yading@10: image noise producing smooth images and making still images really yading@10: still. It should enhance compressibility. yading@10: .PP yading@10: It accepts the following optional parameters: yading@10: .IP "\fBluma_spatial\fR" 4 yading@10: .IX Item "luma_spatial" yading@10: a non-negative float number which specifies spatial luma strength, yading@10: defaults to 4.0 yading@10: .IP "\fBchroma_spatial\fR" 4 yading@10: .IX Item "chroma_spatial" yading@10: a non-negative float number which specifies spatial chroma strength, yading@10: defaults to 3.0*\fIluma_spatial\fR/4.0 yading@10: .IP "\fBluma_tmp\fR" 4 yading@10: .IX Item "luma_tmp" yading@10: a float number which specifies luma temporal strength, defaults to yading@10: 6.0*\fIluma_spatial\fR/4.0 yading@10: .IP "\fBchroma_tmp\fR" 4 yading@10: .IX Item "chroma_tmp" yading@10: a float number which specifies chroma temporal strength, defaults to yading@10: \&\fIluma_tmp\fR*\fIchroma_spatial\fR/\fIluma_spatial\fR yading@10: .SS "hue" yading@10: .IX Subsection "hue" yading@10: Modify the hue and/or the saturation of the input. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: Specify the hue angle as a number of degrees. It accepts an expression, yading@10: and defaults to \*(L"0\*(R". yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: Specify the saturation in the [\-10,10] range. It accepts a float number and yading@10: defaults to \*(L"1\*(R". yading@10: .IP "\fBH\fR" 4 yading@10: .IX Item "H" yading@10: Specify the hue angle as a number of radians. It accepts a float yading@10: number or an expression, and defaults to \*(L"0\*(R". yading@10: .PP yading@10: \&\fBh\fR and \fBH\fR are mutually exclusive, and can't be yading@10: specified at the same time. yading@10: .PP yading@10: The \fBh\fR, \fBH\fR and \fBs\fR option values are yading@10: expressions containing the following constants: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: frame count of the input frame starting from 0 yading@10: .IP "\fBpts\fR" 4 yading@10: .IX Item "pts" yading@10: presentation timestamp of the input frame expressed in time base units yading@10: .IP "\fBr\fR" 4 yading@10: .IX Item "r" yading@10: frame rate of the input video, \s-1NAN\s0 if the input frame rate is unknown yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: timestamp expressed in seconds, \s-1NAN\s0 if the input timestamp is unknown yading@10: .IP "\fBtb\fR" 4 yading@10: .IX Item "tb" yading@10: time base of the input video yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Set the hue to 90 degrees and the saturation to 1.0: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue=h=90:s=1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Same command but expressing the hue in radians: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue=H=PI/2:s=1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Rotate hue and make the saturation swing between 0 yading@10: and 2 over a period of 1 second: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue="H=2*PI*t: s=sin(2*PI*t)+1" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply a 3 seconds saturation fade-in effect starting at 0: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue="s=min(t/3\e,1)" yading@10: .Ve yading@10: .Sp yading@10: The general fade-in expression can be written as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue="s=min(0\e, max((t\-START)/DURATION\e, 1))" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply a 3 seconds saturation fade-out effect starting at 5 seconds: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue="s=max(0\e, min(1\e, (8\-t)/3))" yading@10: .Ve yading@10: .Sp yading@10: The general fade-out expression can be written as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& hue="s=max(0\e, min(1\e, (START+DURATION\-t)/DURATION))" yading@10: .Ve yading@10: .PP yading@10: \fICommands\fR yading@10: .IX Subsection "Commands" yading@10: .PP yading@10: This filter supports the following commands: yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: .PD 0 yading@10: .IP "\fBh\fR" 4 yading@10: .IX Item "h" yading@10: .IP "\fBH\fR" 4 yading@10: .IX Item "H" yading@10: .PD yading@10: Modify the hue and/or the saturation of the input video. yading@10: The command accepts the same syntax of the corresponding option. yading@10: .Sp yading@10: If the specified expression is not valid, it is kept at its current yading@10: value. yading@10: .SS "idet" yading@10: .IX Subsection "idet" yading@10: Detect video interlacing type. yading@10: .PP yading@10: This filter tries to detect if the input is interlaced or progressive, yading@10: top or bottom field first. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBintl_thres\fR" 4 yading@10: .IX Item "intl_thres" yading@10: Set interlacing threshold. yading@10: .IP "\fBprog_thres\fR" 4 yading@10: .IX Item "prog_thres" yading@10: Set progressive threshold. yading@10: .SS "il" yading@10: .IX Subsection "il" yading@10: Deinterleave or interleave fields. yading@10: .PP yading@10: This filter allows to process interlaced images fields without yading@10: deinterlacing them. Deinterleaving splits the input frame into 2 yading@10: fields (so called half pictures). Odd lines are moved to the top yading@10: half of the output image, even lines to the bottom half. yading@10: You can process (filter) them independently and then re-interleave them. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBluma_mode, l\fR" 4 yading@10: .IX Item "luma_mode, l" yading@10: .PD 0 yading@10: .IP "\fBchroma_mode, s\fR" 4 yading@10: .IX Item "chroma_mode, s" yading@10: .IP "\fBalpha_mode, a\fR" 4 yading@10: .IX Item "alpha_mode, a" yading@10: .PD yading@10: Available values for \fIluma_mode\fR, \fIchroma_mode\fR and yading@10: \&\fIalpha_mode\fR are: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: Do nothing. yading@10: .IP "\fBdeinterleave, d\fR" 4 yading@10: .IX Item "deinterleave, d" yading@10: Deinterleave fields, placing one above the other. yading@10: .IP "\fBinterleave, i\fR" 4 yading@10: .IX Item "interleave, i" yading@10: Interleave fields. Reverse the effect of deinterleaving. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`none\*(C'\fR. yading@10: .RE yading@10: .IP "\fBluma_swap, ls\fR" 4 yading@10: .IX Item "luma_swap, ls" yading@10: .PD 0 yading@10: .IP "\fBchroma_swap, cs\fR" 4 yading@10: .IX Item "chroma_swap, cs" yading@10: .IP "\fBalpha_swap, as\fR" 4 yading@10: .IX Item "alpha_swap, as" yading@10: .PD yading@10: Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is \f(CW0\fR. yading@10: .SS "interlace" yading@10: .IX Subsection "interlace" yading@10: Simple interlacing filter from progressive contents. This interleaves upper (or yading@10: lower) lines from odd frames with lower (or upper) lines from even frames, yading@10: halving the frame rate and preserving image height. yading@10: .PP yading@10: .Vb 9 yading@10: \& Original Original New Frame yading@10: \& Frame \*(Aqj\*(Aq Frame \*(Aqj+1\*(Aq (tff) yading@10: \& ========== =========== ================== yading@10: \& Line 0 \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-> Frame \*(Aqj\*(Aq Line 0 yading@10: \& Line 1 Line 1 \-\-\-\-> Frame \*(Aqj+1\*(Aq Line 1 yading@10: \& Line 2 \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-> Frame \*(Aqj\*(Aq Line 2 yading@10: \& Line 3 Line 3 \-\-\-\-> Frame \*(Aqj+1\*(Aq Line 3 yading@10: \& ... ... ... yading@10: \& New Frame + 1 will be generated by Frame \*(Aqj+2\*(Aq and Frame \*(Aqj+3\*(Aq and so on yading@10: .Ve yading@10: .PP yading@10: It accepts the following optional parameters: yading@10: .IP "\fBscan\fR" 4 yading@10: .IX Item "scan" yading@10: determines whether the interlaced frame is taken from the even (tff \- default) yading@10: or odd (bff) lines of the progressive frame. yading@10: .IP "\fBlowpass\fR" 4 yading@10: .IX Item "lowpass" yading@10: Enable (default) or disable the vertical lowpass filter to avoid twitter yading@10: interlacing and reduce moire patterns. yading@10: .SS "kerndeint" yading@10: .IX Subsection "kerndeint" yading@10: Deinterlace input video by applying Donald Graft's adaptive kernel yading@10: deinterling. Work on interlaced parts of a video to produce yading@10: progressive frames. yading@10: .PP yading@10: The description of the accepted parameters follows. yading@10: .IP "\fBthresh\fR" 4 yading@10: .IX Item "thresh" yading@10: Set the threshold which affects the filter's tolerance when yading@10: determining if a pixel line must be processed. It must be an integer yading@10: in the range [0,255] and defaults to 10. A value of 0 will result in yading@10: applying the process on every pixels. yading@10: .IP "\fBmap\fR" 4 yading@10: .IX Item "map" yading@10: Paint pixels exceeding the threshold value to white if set to 1. yading@10: Default is 0. yading@10: .IP "\fBorder\fR" 4 yading@10: .IX Item "order" yading@10: Set the fields order. Swap fields if set to 1, leave fields alone if yading@10: 0. Default is 0. yading@10: .IP "\fBsharp\fR" 4 yading@10: .IX Item "sharp" yading@10: Enable additional sharpening if set to 1. Default is 0. yading@10: .IP "\fBtwoway\fR" 4 yading@10: .IX Item "twoway" yading@10: Enable twoway sharpening if set to 1. Default is 0. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply default values: yading@10: .Sp yading@10: .Vb 1 yading@10: \& kerndeint=thresh=10:map=0:order=0:sharp=0:twoway=0 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Enable additional sharpening: yading@10: .Sp yading@10: .Vb 1 yading@10: \& kerndeint=sharp=1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Paint processed pixels in white: yading@10: .Sp yading@10: .Vb 1 yading@10: \& kerndeint=map=1 yading@10: .Ve yading@10: .SS "lut, lutrgb, lutyuv" yading@10: .IX Subsection "lut, lutrgb, lutyuv" yading@10: Compute a look-up table for binding each pixel component input value yading@10: to an output value, and apply it to input video. yading@10: .PP yading@10: \&\fIlutyuv\fR applies a lookup table to a \s-1YUV\s0 input video, \fIlutrgb\fR yading@10: to an \s-1RGB\s0 input video. yading@10: .PP yading@10: These filters accept the following options: yading@10: .IP "\fBc0\fR" 4 yading@10: .IX Item "c0" yading@10: set first pixel component expression yading@10: .IP "\fBc1\fR" 4 yading@10: .IX Item "c1" yading@10: set second pixel component expression yading@10: .IP "\fBc2\fR" 4 yading@10: .IX Item "c2" yading@10: set third pixel component expression yading@10: .IP "\fBc3\fR" 4 yading@10: .IX Item "c3" yading@10: set fourth pixel component expression, corresponds to the alpha component yading@10: .IP "\fBr\fR" 4 yading@10: .IX Item "r" yading@10: set red component expression yading@10: .IP "\fBg\fR" 4 yading@10: .IX Item "g" yading@10: set green component expression yading@10: .IP "\fBb\fR" 4 yading@10: .IX Item "b" yading@10: set blue component expression yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: alpha component expression yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: set Y/luminance component expression yading@10: .IP "\fBu\fR" 4 yading@10: .IX Item "u" yading@10: set U/Cb component expression yading@10: .IP "\fBv\fR" 4 yading@10: .IX Item "v" yading@10: set V/Cr component expression yading@10: .PP yading@10: Each of them specifies the expression to use for computing the lookup table for yading@10: the corresponding pixel component values. yading@10: .PP yading@10: The exact component associated to each of the \fIc*\fR options depends on the yading@10: format in input. yading@10: .PP yading@10: The \fIlut\fR filter requires either \s-1YUV\s0 or \s-1RGB\s0 pixel formats in input, yading@10: \&\fIlutrgb\fR requires \s-1RGB\s0 pixel formats in input, and \fIlutyuv\fR requires \s-1YUV\s0. yading@10: .PP yading@10: The expressions can contain the following constants and functions: yading@10: .IP "\fBw, h\fR" 4 yading@10: .IX Item "w, h" yading@10: the input width and height yading@10: .IP "\fBval\fR" 4 yading@10: .IX Item "val" yading@10: input value for the pixel component yading@10: .IP "\fBclipval\fR" 4 yading@10: .IX Item "clipval" yading@10: the input value clipped in the \fIminval\fR\-\fImaxval\fR range yading@10: .IP "\fBmaxval\fR" 4 yading@10: .IX Item "maxval" yading@10: maximum value for the pixel component yading@10: .IP "\fBminval\fR" 4 yading@10: .IX Item "minval" yading@10: minimum value for the pixel component yading@10: .IP "\fBnegval\fR" 4 yading@10: .IX Item "negval" yading@10: the negated value for the pixel component value clipped in the yading@10: \&\fIminval\fR\-\fImaxval\fR range , it corresponds to the expression yading@10: \&\*(L"maxval\-clipval+minval\*(R" yading@10: .IP "\fBclip(val)\fR" 4 yading@10: .IX Item "clip(val)" yading@10: the computed value in \fIval\fR clipped in the yading@10: \&\fIminval\fR\-\fImaxval\fR range yading@10: .IP "\fBgammaval(gamma)\fR" 4 yading@10: .IX Item "gammaval(gamma)" yading@10: the computed gamma correction value of the pixel component value yading@10: clipped in the \fIminval\fR\-\fImaxval\fR range, corresponds to the yading@10: expression yading@10: "pow((clipval\-minval)/(maxval\-minval)\e,\fIgamma\fR)*(maxval\-minval)+minval" yading@10: .PP yading@10: All expressions default to \*(L"val\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Negate input video: yading@10: .Sp yading@10: .Vb 2 yading@10: \& lutrgb="r=maxval+minval\-val:g=maxval+minval\-val:b=maxval+minval\-val" yading@10: \& lutyuv="y=maxval+minval\-val:u=maxval+minval\-val:v=maxval+minval\-val" yading@10: .Ve yading@10: .Sp yading@10: The above is the same as: yading@10: .Sp yading@10: .Vb 2 yading@10: \& lutrgb="r=negval:g=negval:b=negval" yading@10: \& lutyuv="y=negval:u=negval:v=negval" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Negate luminance: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutyuv=y=negval yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Remove chroma components, turns the video into a graytone image: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutyuv="u=128:v=128" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply a luma burning effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutyuv="y=2*val" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Remove green and blue components: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutrgb="g=0:b=0" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set a constant alpha channel value on input: yading@10: .Sp yading@10: .Vb 1 yading@10: \& format=rgba,lutrgb=a="maxval\-minval/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Correct luminance gamma by a 0.5 factor: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutyuv=y=gammaval(0.5) yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Discard least significant bits of luma: yading@10: .Sp yading@10: .Vb 1 yading@10: \& lutyuv=y=\*(Aqbitand(val, 128+64+32)\*(Aq yading@10: .Ve yading@10: .SS "mp" yading@10: .IX Subsection "mp" yading@10: Apply an MPlayer filter to the input video. yading@10: .PP yading@10: This filter provides a wrapper around most of the filters of yading@10: MPlayer/MEncoder. yading@10: .PP yading@10: This wrapper is considered experimental. Some of the wrapped filters yading@10: may not work properly and we may drop support for them, as they will yading@10: be implemented natively into FFmpeg. Thus you should avoid yading@10: depending on them when writing portable scripts. yading@10: .PP yading@10: The filters accepts the parameters: yading@10: \&\fIfilter_name\fR[:=]\fIfilter_params\fR yading@10: .PP yading@10: \&\fIfilter_name\fR is the name of a supported MPlayer filter, yading@10: \&\fIfilter_params\fR is a string containing the parameters accepted by yading@10: the named filter. yading@10: .PP yading@10: The list of the currently supported filters follows: yading@10: .IP "\fIdint\fR" 4 yading@10: .IX Item "dint" yading@10: .PD 0 yading@10: .IP "\fIdown3dright\fR" 4 yading@10: .IX Item "down3dright" yading@10: .IP "\fIeq2\fR" 4 yading@10: .IX Item "eq2" yading@10: .IP "\fIeq\fR" 4 yading@10: .IX Item "eq" yading@10: .IP "\fIfil\fR" 4 yading@10: .IX Item "fil" yading@10: .IP "\fIfspp\fR" 4 yading@10: .IX Item "fspp" yading@10: .IP "\fIilpack\fR" 4 yading@10: .IX Item "ilpack" yading@10: .IP "\fImcdeint\fR" 4 yading@10: .IX Item "mcdeint" yading@10: .IP "\fIow\fR" 4 yading@10: .IX Item "ow" yading@10: .IP "\fIperspective\fR" 4 yading@10: .IX Item "perspective" yading@10: .IP "\fIphase\fR" 4 yading@10: .IX Item "phase" yading@10: .IP "\fIpp7\fR" 4 yading@10: .IX Item "pp7" yading@10: .IP "\fIpullup\fR" 4 yading@10: .IX Item "pullup" yading@10: .IP "\fIqp\fR" 4 yading@10: .IX Item "qp" yading@10: .IP "\fIsab\fR" 4 yading@10: .IX Item "sab" yading@10: .IP "\fIsoftpulldown\fR" 4 yading@10: .IX Item "softpulldown" yading@10: .IP "\fIspp\fR" 4 yading@10: .IX Item "spp" yading@10: .IP "\fItinterlace\fR" 4 yading@10: .IX Item "tinterlace" yading@10: .IP "\fIuspp\fR" 4 yading@10: .IX Item "uspp" yading@10: .PD yading@10: .PP yading@10: The parameter syntax and behavior for the listed filters are the same yading@10: of the corresponding MPlayer filters. For detailed instructions check yading@10: the \*(L"\s-1VIDEO\s0 \s-1FILTERS\s0\*(R" section in the MPlayer manual. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Adjust gamma, brightness, contrast: yading@10: .Sp yading@10: .Vb 1 yading@10: \& mp=eq2=1.0:2:0.5 yading@10: .Ve yading@10: .PP yading@10: See also \fImplayer\fR\|(1), <\fBhttp://www.mplayerhq.hu/\fR>. yading@10: .SS "mpdecimate" yading@10: .IX Subsection "mpdecimate" yading@10: Drop frames that do not differ greatly from the previous frame in yading@10: order to reduce frame rate. yading@10: .PP yading@10: The main use of this filter is for very-low-bitrate encoding yading@10: (e.g. streaming over dialup modem), but it could in theory be used for yading@10: fixing movies that were inverse-telecined incorrectly. yading@10: .PP yading@10: A description of the accepted options follows. yading@10: .IP "\fBmax\fR" 4 yading@10: .IX Item "max" yading@10: Set the maximum number of consecutive frames which can be dropped (if yading@10: positive), or the minimum interval between dropped frames (if yading@10: negative). If the value is 0, the frame is dropped unregarding the yading@10: number of previous sequentially dropped frames. yading@10: .Sp yading@10: Default value is 0. yading@10: .IP "\fBhi\fR" 4 yading@10: .IX Item "hi" yading@10: .PD 0 yading@10: .IP "\fBlo\fR" 4 yading@10: .IX Item "lo" yading@10: .IP "\fBfrac\fR" 4 yading@10: .IX Item "frac" yading@10: .PD yading@10: Set the dropping threshold values. yading@10: .Sp yading@10: Values for \fBhi\fR and \fBlo\fR are for 8x8 pixel blocks and yading@10: represent actual pixel value differences, so a threshold of 64 yading@10: corresponds to 1 unit of difference for each pixel, or the same spread yading@10: out differently over the block. yading@10: .Sp yading@10: A frame is a candidate for dropping if no 8x8 blocks differ by more yading@10: than a threshold of \fBhi\fR, and if no more than \fBfrac\fR blocks (1 yading@10: meaning the whole image) differ by more than a threshold of \fBlo\fR. yading@10: .Sp yading@10: Default value for \fBhi\fR is 64*12, default value for \fBlo\fR is yading@10: 64*5, and default value for \fBfrac\fR is 0.33. yading@10: .SS "negate" yading@10: .IX Subsection "negate" yading@10: Negate input video. yading@10: .PP yading@10: This filter accepts an integer in input, if non-zero it negates the yading@10: alpha component (if available). The default value in input is 0. yading@10: .SS "noformat" yading@10: .IX Subsection "noformat" yading@10: Force libavfilter not to use any of the specified pixel formats for the yading@10: input to the next filter. yading@10: .PP yading@10: This filter accepts the following parameters: yading@10: .IP "\fBpix_fmts\fR" 4 yading@10: .IX Item "pix_fmts" yading@10: A '|'\-separated list of pixel format names, for example yading@10: \&\*(L"pix_fmts=yuv420p|monow|rgb24\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Force libavfilter to use a format different from \fIyuv420p\fR for the yading@10: input to the vflip filter: yading@10: .Sp yading@10: .Vb 1 yading@10: \& noformat=pix_fmts=yuv420p,vflip yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Convert the input video to any of the formats not contained in the list: yading@10: .Sp yading@10: .Vb 1 yading@10: \& noformat=yuv420p|yuv444p|yuv410p yading@10: .Ve yading@10: .SS "noise" yading@10: .IX Subsection "noise" yading@10: Add noise on video input frame. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBall_seed\fR" 4 yading@10: .IX Item "all_seed" yading@10: .PD 0 yading@10: .IP "\fBc0_seed\fR" 4 yading@10: .IX Item "c0_seed" yading@10: .IP "\fBc1_seed\fR" 4 yading@10: .IX Item "c1_seed" yading@10: .IP "\fBc2_seed\fR" 4 yading@10: .IX Item "c2_seed" yading@10: .IP "\fBc3_seed\fR" 4 yading@10: .IX Item "c3_seed" yading@10: .PD yading@10: Set noise seed for specific pixel component or all pixel components in case yading@10: of \fIall_seed\fR. Default value is \f(CW123457\fR. yading@10: .IP "\fBall_strength, alls\fR" 4 yading@10: .IX Item "all_strength, alls" yading@10: .PD 0 yading@10: .IP "\fBc0_strength, c0s\fR" 4 yading@10: .IX Item "c0_strength, c0s" yading@10: .IP "\fBc1_strength, c1s\fR" 4 yading@10: .IX Item "c1_strength, c1s" yading@10: .IP "\fBc2_strength, c2s\fR" 4 yading@10: .IX Item "c2_strength, c2s" yading@10: .IP "\fBc3_strength, c3s\fR" 4 yading@10: .IX Item "c3_strength, c3s" yading@10: .PD yading@10: Set noise strength for specific pixel component or all pixel components in case yading@10: \&\fIall_strength\fR. Default value is \f(CW0\fR. Allowed range is [0, 100]. yading@10: .IP "\fBall_flags, allf\fR" 4 yading@10: .IX Item "all_flags, allf" yading@10: .PD 0 yading@10: .IP "\fBc0_flags, c0f\fR" 4 yading@10: .IX Item "c0_flags, c0f" yading@10: .IP "\fBc1_flags, c1f\fR" 4 yading@10: .IX Item "c1_flags, c1f" yading@10: .IP "\fBc2_flags, c2f\fR" 4 yading@10: .IX Item "c2_flags, c2f" yading@10: .IP "\fBc3_flags, c3f\fR" 4 yading@10: .IX Item "c3_flags, c3f" yading@10: .PD yading@10: Set pixel component flags or set flags for all components if \fIall_flags\fR. yading@10: Available values for component flags are: yading@10: .RS 4 yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: averaged temporal noise (smoother) yading@10: .IP "\fBp\fR" 4 yading@10: .IX Item "p" yading@10: mix random noise with a (semi)regular pattern yading@10: .IP "\fBq\fR" 4 yading@10: .IX Item "q" yading@10: higher quality (slightly better looking, slightly slower) yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: temporal noise (noise pattern changes between frames) yading@10: .IP "\fBu\fR" 4 yading@10: .IX Item "u" yading@10: uniform noise (gaussian otherwise) yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .PP yading@10: Add temporal and uniform noise to input video: yading@10: .PP yading@10: .Vb 1 yading@10: \& noise=alls=20:allf=t+u yading@10: .Ve yading@10: .SS "null" yading@10: .IX Subsection "null" yading@10: Pass the video source unchanged to the output. yading@10: .SS "ocv" yading@10: .IX Subsection "ocv" yading@10: Apply video transform using libopencv. yading@10: .PP yading@10: To enable this filter install libopencv library and headers and yading@10: configure FFmpeg with \f(CW\*(C`\-\-enable\-libopencv\*(C'\fR. yading@10: .PP yading@10: This filter accepts the following parameters: yading@10: .IP "\fBfilter_name\fR" 4 yading@10: .IX Item "filter_name" yading@10: The name of the libopencv filter to apply. yading@10: .IP "\fBfilter_params\fR" 4 yading@10: .IX Item "filter_params" yading@10: The parameters to pass to the libopencv filter. If not specified the default yading@10: values are assumed. yading@10: .PP yading@10: Refer to the official libopencv documentation for more precise yading@10: information: yading@10: <\fBhttp://opencv.willowgarage.com/documentation/c/image_filtering.html\fR> yading@10: .PP yading@10: Follows the list of supported libopencv filters. yading@10: .PP yading@10: \fIdilate\fR yading@10: .IX Subsection "dilate" yading@10: .PP yading@10: Dilate an image by using a specific structuring element. yading@10: This filter corresponds to the libopencv function \f(CW\*(C`cvDilate\*(C'\fR. yading@10: .PP yading@10: It accepts the parameters: \fIstruct_el\fR|\fInb_iterations\fR. yading@10: .PP yading@10: \&\fIstruct_el\fR represents a structuring element, and has the syntax: yading@10: \&\fIcols\fRx\fIrows\fR+\fIanchor_x\fRx\fIanchor_y\fR/\fIshape\fR yading@10: .PP yading@10: \&\fIcols\fR and \fIrows\fR represent the number of columns and rows of yading@10: the structuring element, \fIanchor_x\fR and \fIanchor_y\fR the anchor yading@10: point, and \fIshape\fR the shape for the structuring element, and yading@10: can be one of the values \*(L"rect\*(R", \*(L"cross\*(R", \*(L"ellipse\*(R", \*(L"custom\*(R". yading@10: .PP yading@10: If the value for \fIshape\fR is \*(L"custom\*(R", it must be followed by a yading@10: string of the form "=\fIfilename\fR". The file with name yading@10: \&\fIfilename\fR is assumed to represent a binary image, with each yading@10: printable character corresponding to a bright pixel. When a custom yading@10: \&\fIshape\fR is used, \fIcols\fR and \fIrows\fR are ignored, the number yading@10: or columns and rows of the read file are assumed instead. yading@10: .PP yading@10: The default value for \fIstruct_el\fR is \*(L"3x3+0x0/rect\*(R". yading@10: .PP yading@10: \&\fInb_iterations\fR specifies the number of times the transform is yading@10: applied to the image, and defaults to 1. yading@10: .PP yading@10: Follow some example: yading@10: .PP yading@10: .Vb 2 yading@10: \& # use the default values yading@10: \& ocv=dilate yading@10: \& yading@10: \& # dilate using a structuring element with a 5x5 cross, iterate two times yading@10: \& ocv=filter_name=dilate:filter_params=5x5+2x2/cross|2 yading@10: \& yading@10: \& # read the shape from the file diamond.shape, iterate two times yading@10: \& # the file diamond.shape may contain a pattern of characters like this: yading@10: \& # * yading@10: \& # *** yading@10: \& # ***** yading@10: \& # *** yading@10: \& # * yading@10: \& # the specified cols and rows are ignored (but not the anchor point coordinates) yading@10: \& ocv=dilate:0x0+2x2/custom=diamond.shape|2 yading@10: .Ve yading@10: .PP yading@10: \fIerode\fR yading@10: .IX Subsection "erode" yading@10: .PP yading@10: Erode an image by using a specific structuring element. yading@10: This filter corresponds to the libopencv function \f(CW\*(C`cvErode\*(C'\fR. yading@10: .PP yading@10: The filter accepts the parameters: \fIstruct_el\fR:\fInb_iterations\fR, yading@10: with the same syntax and semantics as the dilate filter. yading@10: .PP yading@10: \fIsmooth\fR yading@10: .IX Subsection "smooth" yading@10: .PP yading@10: Smooth the input video. yading@10: .PP yading@10: The filter takes the following parameters: yading@10: \&\fItype\fR|\fIparam1\fR|\fIparam2\fR|\fIparam3\fR|\fIparam4\fR. yading@10: .PP yading@10: \&\fItype\fR is the type of smooth filter to apply, and can be one of yading@10: the following values: \*(L"blur\*(R", \*(L"blur_no_scale\*(R", \*(L"median\*(R", \*(L"gaussian\*(R", yading@10: \&\*(L"bilateral\*(R". The default value is \*(L"gaussian\*(R". yading@10: .PP yading@10: \&\fIparam1\fR, \fIparam2\fR, \fIparam3\fR, and \fIparam4\fR are yading@10: parameters whose meanings depend on smooth type. \fIparam1\fR and yading@10: \&\fIparam2\fR accept integer positive values or 0, \fIparam3\fR and yading@10: \&\fIparam4\fR accept float values. yading@10: .PP yading@10: The default value for \fIparam1\fR is 3, the default value for the yading@10: other parameters is 0. yading@10: .PP yading@10: These parameters correspond to the parameters assigned to the yading@10: libopencv function \f(CW\*(C`cvSmooth\*(C'\fR. yading@10: .SS "overlay" yading@10: .IX Subsection "overlay" yading@10: Overlay one video on top of another. yading@10: .PP yading@10: It takes two inputs and one output, the first input is the \*(L"main\*(R" yading@10: video on which the second input is overlayed. yading@10: .PP yading@10: This filter accepts the following parameters: yading@10: .PP yading@10: A description of the accepted options follows. yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: .PD 0 yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: .PD yading@10: Set the expression for the x and y coordinates of the overlayed video yading@10: on the main video. Default value is \*(L"0\*(R" for both expressions. In case yading@10: the expression is invalid, it is set to a huge value (meaning that the yading@10: overlay will not be displayed within the output visible area). yading@10: .IP "\fBenable\fR" 4 yading@10: .IX Item "enable" yading@10: Set the expression which enables the overlay. If the evaluation is yading@10: different from 0, the overlay is displayed on top of the input yading@10: frame. By default it is \*(L"1\*(R". yading@10: .IP "\fBeval\fR" 4 yading@10: .IX Item "eval" yading@10: Set when the expressions for \fBx\fR, \fBy\fR, and yading@10: \&\fBenable\fR are evaluated. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBinit\fR" 4 yading@10: .IX Item "init" yading@10: only evaluate expressions once during the filter initialization or yading@10: when a command is processed yading@10: .IP "\fBframe\fR" 4 yading@10: .IX Item "frame" yading@10: evaluate expressions for each incoming frame yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBframe\fR. yading@10: .RE yading@10: .IP "\fBshortest\fR" 4 yading@10: .IX Item "shortest" yading@10: If set to 1, force the output to terminate when the shortest input yading@10: terminates. Default value is 0. yading@10: .IP "\fBformat\fR" 4 yading@10: .IX Item "format" yading@10: Set the format for the output video. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fByuv420\fR" 4 yading@10: .IX Item "yuv420" yading@10: force \s-1YUV420\s0 output yading@10: .IP "\fByuv444\fR" 4 yading@10: .IX Item "yuv444" yading@10: force \s-1YUV444\s0 output yading@10: .IP "\fBrgb\fR" 4 yading@10: .IX Item "rgb" yading@10: force \s-1RGB\s0 output yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fByuv420\fR. yading@10: .RE yading@10: .IP "\fBrgb\fR \fI(deprecated)\fR" 4 yading@10: .IX Item "rgb (deprecated)" yading@10: If set to 1, force the filter to accept inputs in the \s-1RGB\s0 yading@10: color space. Default value is 0. This option is deprecated, use yading@10: \&\fBformat\fR instead. yading@10: .IP "\fBrepeatlast\fR" 4 yading@10: .IX Item "repeatlast" yading@10: If set to 1, force the filter to draw the last overlay frame over the yading@10: main input until the end of the stream. A value of 0 disables this yading@10: behavior, which is enabled by default. yading@10: .PP yading@10: The \fBx\fR, \fBy\fR, and \fBenable\fR expressions can yading@10: contain the following parameters. yading@10: .IP "\fBmain_w, W\fR" 4 yading@10: .IX Item "main_w, W" yading@10: .PD 0 yading@10: .IP "\fBmain_h, H\fR" 4 yading@10: .IX Item "main_h, H" yading@10: .PD yading@10: main input width and height yading@10: .IP "\fBoverlay_w, w\fR" 4 yading@10: .IX Item "overlay_w, w" yading@10: .PD 0 yading@10: .IP "\fBoverlay_h, h\fR" 4 yading@10: .IX Item "overlay_h, h" yading@10: .PD yading@10: overlay input width and height yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: .PD 0 yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: .PD yading@10: the computed values for \fIx\fR and \fIy\fR. They are evaluated for yading@10: each new frame. yading@10: .IP "\fBhsub\fR" 4 yading@10: .IX Item "hsub" yading@10: .PD 0 yading@10: .IP "\fBvsub\fR" 4 yading@10: .IX Item "vsub" yading@10: .PD yading@10: horizontal and vertical chroma subsample values of the output yading@10: format. For example for the pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and yading@10: \&\fIvsub\fR is 1. yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: the number of input frame, starting from 0 yading@10: .IP "\fBpos\fR" 4 yading@10: .IX Item "pos" yading@10: the position in the file of the input frame, \s-1NAN\s0 if unknown yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: timestamp expressed in seconds, \s-1NAN\s0 if the input timestamp is unknown yading@10: .PP yading@10: Note that the \fIn\fR, \fIpos\fR, \fIt\fR variables are available only yading@10: when evaluation is done \fIper frame\fR, and will evaluate to \s-1NAN\s0 yading@10: when \fBeval\fR is set to \fBinit\fR. yading@10: .PP yading@10: Be aware that frames are taken from each input video in timestamp yading@10: order, hence, if their initial timestamps differ, it is a a good idea yading@10: to pass the two inputs through a \fIsetpts=PTS\-STARTPTS\fR filter to yading@10: have them begin in the same zero timestamp, as it does the example for yading@10: the \fImovie\fR filter. yading@10: .PP yading@10: You can chain together more overlays but you should test the yading@10: efficiency of such approach. yading@10: .PP yading@10: \fICommands\fR yading@10: .IX Subsection "Commands" yading@10: .PP yading@10: This filter supports the following commands: yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: .PD 0 yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: .IP "\fBenable\fR" 4 yading@10: .IX Item "enable" yading@10: .PD yading@10: Modify the x/y and enable overlay of the overlay input. yading@10: The command accepts the same syntax of the corresponding option. yading@10: .Sp yading@10: If the specified expression is not valid, it is kept at its current yading@10: value. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Draw the overlay at 10 pixels from the bottom right corner of the main yading@10: video: yading@10: .Sp yading@10: .Vb 1 yading@10: \& overlay=main_w\-overlay_w\-10:main_h\-overlay_h\-10 yading@10: .Ve yading@10: .Sp yading@10: Using named options the example above becomes: yading@10: .Sp yading@10: .Vb 1 yading@10: \& overlay=x=main_w\-overlay_w\-10:y=main_h\-overlay_h\-10 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Insert a transparent \s-1PNG\s0 logo in the bottom left corner of the input, yading@10: using the \fBffmpeg\fR tool with the \f(CW\*(C`\-filter_complex\*(C'\fR option: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i input \-i logo \-filter_complex \*(Aqoverlay=10:main_h\-overlay_h\-10\*(Aq output yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Insert 2 different transparent \s-1PNG\s0 logos (second logo on bottom yading@10: right corner) using the \fBffmpeg\fR tool: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i input \-i logo1 \-i logo2 \-filter_complex \*(Aqoverlay=x=10:y=H\-h\-10,overlay=x=W\-w\-10:y=H\-h\-10\*(Aq output yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Add a transparent color layer on top of the main video, \f(CW\*(C`WxH\*(C'\fR yading@10: must specify the size of the main input to the overlay filter: yading@10: .Sp yading@10: .Vb 1 yading@10: \& color=color=red@.3:size=WxH [over]; [in][over] overlay [out] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Play an original video and a filtered version (here with the deshake yading@10: filter) side by side using the \fBffplay\fR tool: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay input.avi \-vf \*(Aqsplit[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w\*(Aq yading@10: .Ve yading@10: .Sp yading@10: The above command is the same as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay input.avi \-vf \*(Aqsplit[b], pad=iw*2[src], [b]deshake, [src]overlay=w\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Make a sliding overlay appearing from the left to the right top part of the yading@10: screen starting since time 2: yading@10: .Sp yading@10: .Vb 1 yading@10: \& overlay=x=\*(Aqif(gte(t,2), \-w+(t\-2)*20, NAN)\*(Aq:y=0 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Compose output by putting two input videos side to side: yading@10: .Sp yading@10: .Vb 7 yading@10: \& ffmpeg \-i left.avi \-i right.avi \-filter_complex " yading@10: \& nullsrc=size=200x100 [background]; yading@10: \& [0:v] setpts=PTS\-STARTPTS, scale=100x100 [left]; yading@10: \& [1:v] setpts=PTS\-STARTPTS, scale=100x100 [right]; yading@10: \& [background][left] overlay=shortest=1 [background+left]; yading@10: \& [background+left][right] overlay=shortest=1:x=100 [left+right] yading@10: \& " yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Chain several overlays in cascade: yading@10: .Sp yading@10: .Vb 6 yading@10: \& nullsrc=s=200x200 [bg]; yading@10: \& testsrc=s=100x100, split=4 [in0][in1][in2][in3]; yading@10: \& [in0] lutrgb=r=0, [bg] overlay=0:0 [mid0]; yading@10: \& [in1] lutrgb=g=0, [mid0] overlay=100:0 [mid1]; yading@10: \& [in2] lutrgb=b=0, [mid1] overlay=0:100 [mid2]; yading@10: \& [in3] null, [mid2] overlay=100:100 [out0] yading@10: .Ve yading@10: .SS "pad" yading@10: .IX Subsection "pad" yading@10: Add paddings to the input image, and place the original input at the yading@10: given coordinates \fIx\fR, \fIy\fR. yading@10: .PP yading@10: This filter accepts the following parameters: yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: .PD 0 yading@10: .IP "\fBheight, h\fR" 4 yading@10: .IX Item "height, h" yading@10: .PD yading@10: Specify an expression for the size of the output image with the yading@10: paddings added. If the value for \fIwidth\fR or \fIheight\fR is 0, the yading@10: corresponding input size is used for the output. yading@10: .Sp yading@10: The \fIwidth\fR expression can reference the value set by the yading@10: \&\fIheight\fR expression, and vice versa. yading@10: .Sp yading@10: The default value of \fIwidth\fR and \fIheight\fR is 0. yading@10: .IP "\fBx\fR" 4 yading@10: .IX Item "x" yading@10: .PD 0 yading@10: .IP "\fBy\fR" 4 yading@10: .IX Item "y" yading@10: .PD yading@10: Specify an expression for the offsets where to place the input image yading@10: in the padded area with respect to the top/left border of the output yading@10: image. yading@10: .Sp yading@10: The \fIx\fR expression can reference the value set by the \fIy\fR yading@10: expression, and vice versa. yading@10: .Sp yading@10: The default value of \fIx\fR and \fIy\fR is 0. yading@10: .IP "\fBcolor\fR" 4 yading@10: .IX Item "color" yading@10: Specify the color of the padded area, it can be the name of a color yading@10: (case insensitive match) or a 0xRRGGBB[\s-1AA\s0] sequence. yading@10: .Sp yading@10: The default value of \fIcolor\fR is \*(L"black\*(R". yading@10: .PP yading@10: The value for the \fIwidth\fR, \fIheight\fR, \fIx\fR, and \fIy\fR yading@10: options are expressions containing the following constants: yading@10: .IP "\fBin_w, in_h\fR" 4 yading@10: .IX Item "in_w, in_h" yading@10: the input video width and height yading@10: .IP "\fBiw, ih\fR" 4 yading@10: .IX Item "iw, ih" yading@10: same as \fIin_w\fR and \fIin_h\fR yading@10: .IP "\fBout_w, out_h\fR" 4 yading@10: .IX Item "out_w, out_h" yading@10: the output width and height, that is the size of the padded area as yading@10: specified by the \fIwidth\fR and \fIheight\fR expressions yading@10: .IP "\fBow, oh\fR" 4 yading@10: .IX Item "ow, oh" yading@10: same as \fIout_w\fR and \fIout_h\fR yading@10: .IP "\fBx, y\fR" 4 yading@10: .IX Item "x, y" yading@10: x and y offsets as specified by the \fIx\fR and \fIy\fR yading@10: expressions, or \s-1NAN\s0 if not yet specified yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: same as \fIiw\fR / \fIih\fR yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: input sample aspect ratio yading@10: .IP "\fBdar\fR" 4 yading@10: .IX Item "dar" yading@10: input display aspect ratio, it is the same as (\fIiw\fR / \fIih\fR) * \fIsar\fR yading@10: .IP "\fBhsub, vsub\fR" 4 yading@10: .IX Item "hsub, vsub" yading@10: horizontal and vertical chroma subsample values. For example for the yading@10: pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and \fIvsub\fR is 1. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Add paddings with color \*(L"violet\*(R" to the input video. Output video yading@10: size is 640x480, the top-left corner of the input video is placed at yading@10: column 0, row 40: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad=640:480:0:40:violet yading@10: .Ve yading@10: .Sp yading@10: The example above is equivalent to the following command: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad=width=640:height=480:x=0:y=40:color=violet yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Pad the input to get an output with dimensions increased by 3/2, yading@10: and put the input video at the center of the padded area: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad="3/2*iw:3/2*ih:(ow\-iw)/2:(oh\-ih)/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Pad the input to get a squared output with size equal to the maximum yading@10: value between the input width and height, and put the input video at yading@10: the center of the padded area: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad="max(iw\e,ih):ow:(ow\-iw)/2:(oh\-ih)/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Pad the input to get a final w/h ratio of 16:9: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad="ih*16/9:ih:(ow\-iw)/2:(oh\-ih)/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: In case of anamorphic video, in order to set the output display aspect yading@10: correctly, it is necessary to use \fIsar\fR in the expression, yading@10: according to the relation: yading@10: .Sp yading@10: .Vb 2 yading@10: \& (ih * X / ih) * sar = output_dar yading@10: \& X = output_dar / sar yading@10: .Ve yading@10: .Sp yading@10: Thus the previous example needs to be modified to: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad="ih*16/9/sar:ih:(ow\-iw)/2:(oh\-ih)/2" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Double output size and put the input video in the bottom-right yading@10: corner of the output padded area: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pad="2*iw:2*ih:ow\-iw:oh\-ih" yading@10: .Ve yading@10: .SS "pixdesctest" yading@10: .IX Subsection "pixdesctest" yading@10: Pixel format descriptor test filter, mainly useful for internal yading@10: testing. The output video should be equal to the input video. yading@10: .PP yading@10: For example: yading@10: .PP yading@10: .Vb 1 yading@10: \& format=monow, pixdesctest yading@10: .Ve yading@10: .PP yading@10: can be used to test the monowhite pixel format descriptor definition. yading@10: .SS "pp" yading@10: .IX Subsection "pp" yading@10: Enable the specified chain of postprocessing subfilters using libpostproc. This yading@10: library should be automatically selected with a \s-1GPL\s0 build (\f(CW\*(C`\-\-enable\-gpl\*(C'\fR). yading@10: Subfilters must be separated by '/' and can be disabled by prepending a '\-'. yading@10: Each subfilter and some options have a short and a long name that can be used yading@10: interchangeably, i.e. dr/dering are the same. yading@10: .PP yading@10: The filters accept the following options: yading@10: .IP "\fBsubfilters\fR" 4 yading@10: .IX Item "subfilters" yading@10: Set postprocessing subfilters string. yading@10: .PP yading@10: All subfilters share common options to determine their scope: yading@10: .IP "\fBa/autoq\fR" 4 yading@10: .IX Item "a/autoq" yading@10: Honor the quality commands for this subfilter. yading@10: .IP "\fBc/chrom\fR" 4 yading@10: .IX Item "c/chrom" yading@10: Do chrominance filtering, too (default). yading@10: .IP "\fBy/nochrom\fR" 4 yading@10: .IX Item "y/nochrom" yading@10: Do luminance filtering only (no chrominance). yading@10: .IP "\fBn/noluma\fR" 4 yading@10: .IX Item "n/noluma" yading@10: Do chrominance filtering only (no luminance). yading@10: .PP yading@10: These options can be appended after the subfilter name, separated by a '|'. yading@10: .PP yading@10: Available subfilters are: yading@10: .IP "\fBhb/hdeblock[|difference[|flatness]]\fR" 4 yading@10: .IX Item "hb/hdeblock[|difference[|flatness]]" yading@10: Horizontal deblocking filter yading@10: .RS 4 yading@10: .IP "\fBdifference\fR" 4 yading@10: .IX Item "difference" yading@10: Difference factor where higher values mean more deblocking (default: \f(CW32\fR). yading@10: .IP "\fBflatness\fR" 4 yading@10: .IX Item "flatness" yading@10: Flatness threshold where lower values mean more deblocking (default: \f(CW39\fR). yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBvb/vdeblock[|difference[|flatness]]\fR" 4 yading@10: .IX Item "vb/vdeblock[|difference[|flatness]]" yading@10: Vertical deblocking filter yading@10: .RS 4 yading@10: .IP "\fBdifference\fR" 4 yading@10: .IX Item "difference" yading@10: Difference factor where higher values mean more deblocking (default: \f(CW32\fR). yading@10: .IP "\fBflatness\fR" 4 yading@10: .IX Item "flatness" yading@10: Flatness threshold where lower values mean more deblocking (default: \f(CW39\fR). yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBha/hadeblock[|difference[|flatness]]\fR" 4 yading@10: .IX Item "ha/hadeblock[|difference[|flatness]]" yading@10: Accurate horizontal deblocking filter yading@10: .RS 4 yading@10: .IP "\fBdifference\fR" 4 yading@10: .IX Item "difference" yading@10: Difference factor where higher values mean more deblocking (default: \f(CW32\fR). yading@10: .IP "\fBflatness\fR" 4 yading@10: .IX Item "flatness" yading@10: Flatness threshold where lower values mean more deblocking (default: \f(CW39\fR). yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBva/vadeblock[|difference[|flatness]]\fR" 4 yading@10: .IX Item "va/vadeblock[|difference[|flatness]]" yading@10: Accurate vertical deblocking filter yading@10: .RS 4 yading@10: .IP "\fBdifference\fR" 4 yading@10: .IX Item "difference" yading@10: Difference factor where higher values mean more deblocking (default: \f(CW32\fR). yading@10: .IP "\fBflatness\fR" 4 yading@10: .IX Item "flatness" yading@10: Flatness threshold where lower values mean more deblocking (default: \f(CW39\fR). yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .PP yading@10: The horizontal and vertical deblocking filters share the difference and yading@10: flatness values so you cannot set different horizontal and vertical yading@10: thresholds. yading@10: .IP "\fBh1/x1hdeblock\fR" 4 yading@10: .IX Item "h1/x1hdeblock" yading@10: Experimental horizontal deblocking filter yading@10: .IP "\fBv1/x1vdeblock\fR" 4 yading@10: .IX Item "v1/x1vdeblock" yading@10: Experimental vertical deblocking filter yading@10: .IP "\fBdr/dering\fR" 4 yading@10: .IX Item "dr/dering" yading@10: Deringing filter yading@10: .IP "\fBtn/tmpnoise[|threshold1[|threshold2[|threshold3]]], temporal noise reducer\fR" 4 yading@10: .IX Item "tn/tmpnoise[|threshold1[|threshold2[|threshold3]]], temporal noise reducer" yading@10: .RS 4 yading@10: .PD 0 yading@10: .IP "\fBthreshold1\fR" 4 yading@10: .IX Item "threshold1" yading@10: .PD yading@10: larger \-> stronger filtering yading@10: .IP "\fBthreshold2\fR" 4 yading@10: .IX Item "threshold2" yading@10: larger \-> stronger filtering yading@10: .IP "\fBthreshold3\fR" 4 yading@10: .IX Item "threshold3" yading@10: larger \-> stronger filtering yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBal/autolevels[:f/fullyrange], automatic brightness / contrast correction\fR" 4 yading@10: .IX Item "al/autolevels[:f/fullyrange], automatic brightness / contrast correction" yading@10: .RS 4 yading@10: .PD 0 yading@10: .IP "\fBf/fullyrange\fR" 4 yading@10: .IX Item "f/fullyrange" yading@10: .PD yading@10: Stretch luminance to \f(CW\*(C`0\-255\*(C'\fR. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBlb/linblenddeint\fR" 4 yading@10: .IX Item "lb/linblenddeint" yading@10: Linear blend deinterlacing filter that deinterlaces the given block by yading@10: filtering all lines with a \f(CW\*(C`(1 2 1)\*(C'\fR filter. yading@10: .IP "\fBli/linipoldeint\fR" 4 yading@10: .IX Item "li/linipoldeint" yading@10: Linear interpolating deinterlacing filter that deinterlaces the given block by yading@10: linearly interpolating every second line. yading@10: .IP "\fBci/cubicipoldeint\fR" 4 yading@10: .IX Item "ci/cubicipoldeint" yading@10: Cubic interpolating deinterlacing filter deinterlaces the given block by yading@10: cubically interpolating every second line. yading@10: .IP "\fBmd/mediandeint\fR" 4 yading@10: .IX Item "md/mediandeint" yading@10: Median deinterlacing filter that deinterlaces the given block by applying a yading@10: median filter to every second line. yading@10: .IP "\fBfd/ffmpegdeint\fR" 4 yading@10: .IX Item "fd/ffmpegdeint" yading@10: FFmpeg deinterlacing filter that deinterlaces the given block by filtering every yading@10: second line with a \f(CW\*(C`(\-1 4 2 4 \-1)\*(C'\fR filter. yading@10: .IP "\fBl5/lowpass5\fR" 4 yading@10: .IX Item "l5/lowpass5" yading@10: Vertically applied \s-1FIR\s0 lowpass deinterlacing filter that deinterlaces the given yading@10: block by filtering all lines with a \f(CW\*(C`(\-1 2 6 2 \-1)\*(C'\fR filter. yading@10: .IP "\fBfq/forceQuant[|quantizer]\fR" 4 yading@10: .IX Item "fq/forceQuant[|quantizer]" yading@10: Overrides the quantizer table from the input with the constant quantizer you yading@10: specify. yading@10: .RS 4 yading@10: .IP "\fBquantizer\fR" 4 yading@10: .IX Item "quantizer" yading@10: Quantizer to use yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBde/default\fR" 4 yading@10: .IX Item "de/default" yading@10: Default pp filter combination (\f(CW\*(C`hb|a,vb|a,dr|a\*(C'\fR) yading@10: .IP "\fBfa/fast\fR" 4 yading@10: .IX Item "fa/fast" yading@10: Fast pp filter combination (\f(CW\*(C`h1|a,v1|a,dr|a\*(C'\fR) yading@10: .IP "\fBac\fR" 4 yading@10: .IX Item "ac" yading@10: High quality pp filter combination (\f(CW\*(C`ha|a|128|7,va|a,dr|a\*(C'\fR) yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply horizontal and vertical deblocking, deringing and automatic yading@10: brightness/contrast: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pp=hb/vb/dr/al yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply default filters without brightness/contrast correction: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pp=de/\-al yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply default filters and temporal denoiser: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pp=default/tmpnoise|1|2|3 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply deblocking on luminance only, and switch vertical deblocking on or off yading@10: automatically depending on available \s-1CPU\s0 time: yading@10: .Sp yading@10: .Vb 1 yading@10: \& pp=hb|y/vb|a yading@10: .Ve yading@10: .SS "removelogo" yading@10: .IX Subsection "removelogo" yading@10: Suppress a \s-1TV\s0 station logo, using an image file to determine which yading@10: pixels comprise the logo. It works by filling in the pixels that yading@10: comprise the logo with neighboring pixels. yading@10: .PP yading@10: The filters accept the following options: yading@10: .IP "\fBfilename, f\fR" 4 yading@10: .IX Item "filename, f" yading@10: Set the filter bitmap file, which can be any image format supported by yading@10: libavformat. The width and height of the image file must match those of the yading@10: video stream being processed. yading@10: .PP yading@10: Pixels in the provided bitmap image with a value of zero are not yading@10: considered part of the logo, non-zero pixels are considered part of yading@10: the logo. If you use white (255) for the logo and black (0) for the yading@10: rest, you will be safe. For making the filter bitmap, it is yading@10: recommended to take a screen capture of a black frame with the logo yading@10: visible, and then using a threshold filter followed by the erode yading@10: filter once or twice. yading@10: .PP yading@10: If needed, little splotches can be fixed manually. Remember that if yading@10: logo pixels are not covered, the filter quality will be much yading@10: reduced. Marking too many pixels as part of the logo does not hurt as yading@10: much, but it will increase the amount of blurring needed to cover over yading@10: the image and will destroy more information than necessary, and extra yading@10: pixels will slow things down on a large logo. yading@10: .SS "scale" yading@10: .IX Subsection "scale" yading@10: Scale (resize) the input video, using the libswscale library. yading@10: .PP yading@10: The scale filter forces the output display aspect ratio to be the same yading@10: of the input, by changing the output sample aspect ratio. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBwidth, w\fR" 4 yading@10: .IX Item "width, w" yading@10: Output video width. yading@10: default value is \f(CW\*(C`iw\*(C'\fR. See below yading@10: for the list of accepted constants. yading@10: .IP "\fBheight, h\fR" 4 yading@10: .IX Item "height, h" yading@10: Output video height. yading@10: default value is \f(CW\*(C`ih\*(C'\fR. yading@10: See below for the list of accepted constants. yading@10: .IP "\fBinterl\fR" 4 yading@10: .IX Item "interl" yading@10: Set the interlacing. It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fB1\fR" 4 yading@10: .IX Item "1" yading@10: force interlaced aware scaling yading@10: .IP "\fB0\fR" 4 yading@10: .IX Item "0" yading@10: do not apply interlaced scaling yading@10: .IP "\fB\-1\fR" 4 yading@10: .IX Item "-1" yading@10: select interlaced aware scaling depending on whether the source frames yading@10: are flagged as interlaced or not yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW0\fR. yading@10: .RE yading@10: .IP "\fBflags\fR" 4 yading@10: .IX Item "flags" yading@10: Set libswscale scaling flags. If not explictly specified the filter yading@10: applies a bilinear scaling algorithm. yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Set the video size, the value must be a valid abbreviation or in the yading@10: form \fIwidth\fRx\fIheight\fR. yading@10: .PP yading@10: The values of the \fIw\fR and \fIh\fR options are expressions yading@10: containing the following constants: yading@10: .IP "\fBin_w, in_h\fR" 4 yading@10: .IX Item "in_w, in_h" yading@10: the input width and height yading@10: .IP "\fBiw, ih\fR" 4 yading@10: .IX Item "iw, ih" yading@10: same as \fIin_w\fR and \fIin_h\fR yading@10: .IP "\fBout_w, out_h\fR" 4 yading@10: .IX Item "out_w, out_h" yading@10: the output (cropped) width and height yading@10: .IP "\fBow, oh\fR" 4 yading@10: .IX Item "ow, oh" yading@10: same as \fIout_w\fR and \fIout_h\fR yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: same as \fIiw\fR / \fIih\fR yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: input sample aspect ratio yading@10: .IP "\fBdar\fR" 4 yading@10: .IX Item "dar" yading@10: input display aspect ratio, it is the same as (\fIiw\fR / \fIih\fR) * \fIsar\fR yading@10: .IP "\fBhsub, vsub\fR" 4 yading@10: .IX Item "hsub, vsub" yading@10: horizontal and vertical chroma subsample values. For example for the yading@10: pixel format \*(L"yuv422p\*(R" \fIhsub\fR is 2 and \fIvsub\fR is 1. yading@10: .PP yading@10: If the input image format is different from the format requested by yading@10: the next filter, the scale filter will convert the input to the yading@10: requested format. yading@10: .PP yading@10: If the value for \fIw\fR or \fIh\fR is 0, the respective input yading@10: size is used for the output. yading@10: .PP yading@10: If the value for \fIw\fR or \fIh\fR is \-1, the scale filter will use, for the yading@10: respective output size, a value that maintains the aspect ratio of the input yading@10: image. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Scale the input video to a size of 200x100: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=200:h=100 yading@10: .Ve yading@10: .Sp yading@10: This is equivalent to: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=200:h=100 yading@10: .Ve yading@10: .Sp yading@10: or: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=200x100 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Specify a size abbreviation for the output size: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=qcif yading@10: .Ve yading@10: .Sp yading@10: which can also be written as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=size=qcif yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Scale the input to 2x: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=2*iw:h=2*ih yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: The above is the same as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=2*in_w:2*in_h yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Scale the input to 2x with forced interlaced scaling: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=2*iw:2*ih:interl=1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Scale the input to half size: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=iw/2:h=ih/2 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Increase the width, and set the height to the same size: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=3/2*iw:ow yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Seek for Greek harmony: yading@10: .Sp yading@10: .Vb 2 yading@10: \& scale=iw:1/PHI*iw yading@10: \& scale=ih*PHI:ih yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Increase the height, and set the width to 3/2 of the height: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=3/2*oh:h=3/5*ih yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Increase the size, but make the size a multiple of the chroma yading@10: subsample values: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Increase the width to a maximum of 500 pixels, keep the same input yading@10: aspect ratio: yading@10: .Sp yading@10: .Vb 1 yading@10: \& scale=w=\*(Aqmin(500\e, iw*3/2):h=\-1\*(Aq yading@10: .Ve yading@10: .SS "separatefields" yading@10: .IX Subsection "separatefields" yading@10: The \f(CW\*(C`separatefields\*(C'\fR takes a frame-based video input and splits yading@10: each frame into its components fields, producing a new half height clip yading@10: with twice the frame rate and twice the frame count. yading@10: .PP yading@10: This filter use field-dominance information in frame to decide which yading@10: of each pair of fields to place first in the output. yading@10: If it gets it wrong use setfield filter before \f(CW\*(C`separatefields\*(C'\fR filter. yading@10: .SS "setdar, setsar" yading@10: .IX Subsection "setdar, setsar" yading@10: The \f(CW\*(C`setdar\*(C'\fR filter sets the Display Aspect Ratio for the filter yading@10: output video. yading@10: .PP yading@10: This is done by changing the specified Sample (aka Pixel) Aspect yading@10: Ratio, according to the following equation: yading@10: .PP yading@10: .Vb 1 yading@10: \& = / * yading@10: .Ve yading@10: .PP yading@10: Keep in mind that the \f(CW\*(C`setdar\*(C'\fR filter does not modify the pixel yading@10: dimensions of the video frame. Also the display aspect ratio set by yading@10: this filter may be changed by later filters in the filterchain, yading@10: e.g. in case of scaling or if another \*(L"setdar\*(R" or a \*(L"setsar\*(R" filter is yading@10: applied. yading@10: .PP yading@10: The \f(CW\*(C`setsar\*(C'\fR filter sets the Sample (aka Pixel) Aspect Ratio for yading@10: the filter output video. yading@10: .PP yading@10: Note that as a consequence of the application of this filter, the yading@10: output display aspect ratio will change according to the equation yading@10: above. yading@10: .PP yading@10: Keep in mind that the sample aspect ratio set by the \f(CW\*(C`setsar\*(C'\fR yading@10: filter may be changed by later filters in the filterchain, e.g. if yading@10: another \*(L"setsar\*(R" or a \*(L"setdar\*(R" filter is applied. yading@10: .PP yading@10: The filters accept the following options: yading@10: .ie n .IP "\fBr, ratio, dar (\fB""setdar""\fB only), sar (\f(BI""setsar""\fB only)\fR" 4 yading@10: .el .IP "\fBr, ratio, dar (\f(CBsetdar\fB only), sar (\f(CBsetsar\fB only)\fR" 4 yading@10: .IX Item "r, ratio, dar (setdar only), sar (setsar only)" yading@10: Set the aspect ratio used by the filter. yading@10: .Sp yading@10: The parameter can be a floating point number string, an expression, or yading@10: a string of the form \fInum\fR:\fIden\fR, where \fInum\fR and yading@10: \&\fIden\fR are the numerator and denominator of the aspect ratio. If yading@10: the parameter is not specified, it is assumed the value \*(L"0\*(R". yading@10: In case the form "\fInum\fR:\fIden\fR" is used, the \f(CW\*(C`:\*(C'\fR character yading@10: should be escaped. yading@10: .IP "\fBmax\fR" 4 yading@10: .IX Item "max" yading@10: Set the maximum integer value to use for expressing numerator and yading@10: denominator when reducing the expressed aspect ratio to a rational. yading@10: Default value is \f(CW100\fR. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: To change the display aspect ratio to 16:9, specify one of the following: yading@10: .Sp yading@10: .Vb 3 yading@10: \& setdar=dar=1.77777 yading@10: \& setdar=dar=16/9 yading@10: \& setdar=dar=1.77777 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: To change the sample aspect ratio to 10:11, specify: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setsar=sar=10/11 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: To set a display aspect ratio of 16:9, and specify a maximum integer value of yading@10: 1000 in the aspect ratio reduction, use the command: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setdar=ratio=16/9:max=1000 yading@10: .Ve yading@10: .SS "setfield" yading@10: .IX Subsection "setfield" yading@10: Force field for the output video frame. yading@10: .PP yading@10: The \f(CW\*(C`setfield\*(C'\fR filter marks the interlace type field for the yading@10: output frames. It does not change the input frame, but only sets the yading@10: corresponding property, which affects how the frame is treated by yading@10: following filters (e.g. \f(CW\*(C`fieldorder\*(C'\fR or \f(CW\*(C`yadif\*(C'\fR). yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBauto\fR" 4 yading@10: .IX Item "auto" yading@10: Keep the same field property. yading@10: .IP "\fBbff\fR" 4 yading@10: .IX Item "bff" yading@10: Mark the frame as bottom-field-first. yading@10: .IP "\fBtff\fR" 4 yading@10: .IX Item "tff" yading@10: Mark the frame as top-field-first. yading@10: .IP "\fBprog\fR" 4 yading@10: .IX Item "prog" yading@10: Mark the frame as progressive. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .SS "showinfo" yading@10: .IX Subsection "showinfo" yading@10: Show a line containing various information for each input video frame. yading@10: The input video is not modified. yading@10: .PP yading@10: The shown line contains a sequence of key/value pairs of the form yading@10: \&\fIkey\fR:\fIvalue\fR. yading@10: .PP yading@10: A description of each shown parameter follows: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: sequential number of the input frame, starting from 0 yading@10: .IP "\fBpts\fR" 4 yading@10: .IX Item "pts" yading@10: Presentation TimeStamp of the input frame, expressed as a number of yading@10: time base units. The time base unit depends on the filter input pad. yading@10: .IP "\fBpts_time\fR" 4 yading@10: .IX Item "pts_time" yading@10: Presentation TimeStamp of the input frame, expressed as a number of yading@10: seconds yading@10: .IP "\fBpos\fR" 4 yading@10: .IX Item "pos" yading@10: position of the frame in the input stream, \-1 if this information in yading@10: unavailable and/or meaningless (for example in case of synthetic video) yading@10: .IP "\fBfmt\fR" 4 yading@10: .IX Item "fmt" yading@10: pixel format name yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: sample aspect ratio of the input frame, expressed in the form yading@10: \&\fInum\fR/\fIden\fR yading@10: .IP "\fBs\fR" 4 yading@10: .IX Item "s" yading@10: size of the input frame, expressed in the form yading@10: \&\fIwidth\fRx\fIheight\fR yading@10: .IP "\fBi\fR" 4 yading@10: .IX Item "i" yading@10: interlaced mode (\*(L"P\*(R" for \*(L"progressive\*(R", \*(L"T\*(R" for top field first, \*(L"B\*(R" yading@10: for bottom field first) yading@10: .IP "\fBiskey\fR" 4 yading@10: .IX Item "iskey" yading@10: 1 if the frame is a key frame, 0 otherwise yading@10: .IP "\fBtype\fR" 4 yading@10: .IX Item "type" yading@10: picture type of the input frame (\*(L"I\*(R" for an I\-frame, \*(L"P\*(R" for a yading@10: P\-frame, \*(L"B\*(R" for a B\-frame, \*(L"?\*(R" for unknown type). yading@10: Check also the documentation of the \f(CW\*(C`AVPictureType\*(C'\fR enum and of yading@10: the \f(CW\*(C`av_get_picture_type_char\*(C'\fR function defined in yading@10: \&\fIlibavutil/avutil.h\fR. yading@10: .IP "\fBchecksum\fR" 4 yading@10: .IX Item "checksum" yading@10: Adler\-32 checksum (printed in hexadecimal) of all the planes of the input frame yading@10: .IP "\fBplane_checksum\fR" 4 yading@10: .IX Item "plane_checksum" yading@10: Adler\-32 checksum (printed in hexadecimal) of each plane of the input frame, yading@10: expressed in the form "[\fIc0\fR \fIc1\fR \fIc2\fR \fIc3\fR]" yading@10: .SS "smartblur" yading@10: .IX Subsection "smartblur" yading@10: Blur the input video without impacting the outlines. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBluma_radius, lr\fR" 4 yading@10: .IX Item "luma_radius, lr" yading@10: Set the luma radius. The option value must be a float number in yading@10: the range [0.1,5.0] that specifies the variance of the gaussian filter yading@10: used to blur the image (slower if larger). Default value is 1.0. yading@10: .IP "\fBluma_strength, ls\fR" 4 yading@10: .IX Item "luma_strength, ls" yading@10: Set the luma strength. The option value must be a float number yading@10: in the range [\-1.0,1.0] that configures the blurring. A value included yading@10: in [0.0,1.0] will blur the image whereas a value included in yading@10: [\-1.0,0.0] will sharpen the image. Default value is 1.0. yading@10: .IP "\fBluma_threshold, lt\fR" 4 yading@10: .IX Item "luma_threshold, lt" yading@10: Set the luma threshold used as a coefficient to determine yading@10: whether a pixel should be blurred or not. The option value must be an yading@10: integer in the range [\-30,30]. A value of 0 will filter all the image, yading@10: a value included in [0,30] will filter flat areas and a value included yading@10: in [\-30,0] will filter edges. Default value is 0. yading@10: .IP "\fBchroma_radius, cr\fR" 4 yading@10: .IX Item "chroma_radius, cr" yading@10: Set the chroma radius. The option value must be a float number in yading@10: the range [0.1,5.0] that specifies the variance of the gaussian filter yading@10: used to blur the image (slower if larger). Default value is 1.0. yading@10: .IP "\fBchroma_strength, cs\fR" 4 yading@10: .IX Item "chroma_strength, cs" yading@10: Set the chroma strength. The option value must be a float number yading@10: in the range [\-1.0,1.0] that configures the blurring. A value included yading@10: in [0.0,1.0] will blur the image whereas a value included in yading@10: [\-1.0,0.0] will sharpen the image. Default value is 1.0. yading@10: .IP "\fBchroma_threshold, ct\fR" 4 yading@10: .IX Item "chroma_threshold, ct" yading@10: Set the chroma threshold used as a coefficient to determine yading@10: whether a pixel should be blurred or not. The option value must be an yading@10: integer in the range [\-30,30]. A value of 0 will filter all the image, yading@10: a value included in [0,30] will filter flat areas and a value included yading@10: in [\-30,0] will filter edges. Default value is 0. yading@10: .PP yading@10: If a chroma option is not explicitly set, the corresponding luma value yading@10: is set. yading@10: .SS "stereo3d" yading@10: .IX Subsection "stereo3d" yading@10: Convert between different stereoscopic image formats. yading@10: .PP yading@10: The filters accept the following options: yading@10: .IP "\fBin\fR" 4 yading@10: .IX Item "in" yading@10: Set stereoscopic image format of input. yading@10: .Sp yading@10: Available values for input image formats are: yading@10: .RS 4 yading@10: .IP "\fBsbsl\fR" 4 yading@10: .IX Item "sbsl" yading@10: side by side parallel (left eye left, right eye right) yading@10: .IP "\fBsbsr\fR" 4 yading@10: .IX Item "sbsr" yading@10: side by side crosseye (right eye left, left eye right) yading@10: .IP "\fBsbs2l\fR" 4 yading@10: .IX Item "sbs2l" yading@10: side by side parallel with half width resolution yading@10: (left eye left, right eye right) yading@10: .IP "\fBsbs2r\fR" 4 yading@10: .IX Item "sbs2r" yading@10: side by side crosseye with half width resolution yading@10: (right eye left, left eye right) yading@10: .IP "\fBabl\fR" 4 yading@10: .IX Item "abl" yading@10: above-below (left eye above, right eye below) yading@10: .IP "\fBabr\fR" 4 yading@10: .IX Item "abr" yading@10: above-below (right eye above, left eye below) yading@10: .IP "\fBab2l\fR" 4 yading@10: .IX Item "ab2l" yading@10: above-below with half height resolution yading@10: (left eye above, right eye below) yading@10: .IP "\fBab2r\fR" 4 yading@10: .IX Item "ab2r" yading@10: above-below with half height resolution yading@10: (right eye above, left eye below) yading@10: .Sp yading@10: Default value is \fBsbsl\fR. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBout\fR" 4 yading@10: .IX Item "out" yading@10: Set stereoscopic image format of output. yading@10: .Sp yading@10: Available values for output image formats are all the input formats as well as: yading@10: .RS 4 yading@10: .IP "\fBarbg\fR" 4 yading@10: .IX Item "arbg" yading@10: anaglyph red/blue gray yading@10: (red filter on left eye, blue filter on right eye) yading@10: .IP "\fBargg\fR" 4 yading@10: .IX Item "argg" yading@10: anaglyph red/green gray yading@10: (red filter on left eye, green filter on right eye) yading@10: .IP "\fBarcg\fR" 4 yading@10: .IX Item "arcg" yading@10: anaglyph red/cyan gray yading@10: (red filter on left eye, cyan filter on right eye) yading@10: .IP "\fBarch\fR" 4 yading@10: .IX Item "arch" yading@10: anaglyph red/cyan half colored yading@10: (red filter on left eye, cyan filter on right eye) yading@10: .IP "\fBarcc\fR" 4 yading@10: .IX Item "arcc" yading@10: anaglyph red/cyan color yading@10: (red filter on left eye, cyan filter on right eye) yading@10: .IP "\fBarcd\fR" 4 yading@10: .IX Item "arcd" yading@10: anaglyph red/cyan color optimized with the least squares projection of dubois yading@10: (red filter on left eye, cyan filter on right eye) yading@10: .IP "\fBagmg\fR" 4 yading@10: .IX Item "agmg" yading@10: anaglyph green/magenta gray yading@10: (green filter on left eye, magenta filter on right eye) yading@10: .IP "\fBagmh\fR" 4 yading@10: .IX Item "agmh" yading@10: anaglyph green/magenta half colored yading@10: (green filter on left eye, magenta filter on right eye) yading@10: .IP "\fBagmc\fR" 4 yading@10: .IX Item "agmc" yading@10: anaglyph green/magenta colored yading@10: (green filter on left eye, magenta filter on right eye) yading@10: .IP "\fBagmd\fR" 4 yading@10: .IX Item "agmd" yading@10: anaglyph green/magenta color optimized with the least squares projection of dubois yading@10: (green filter on left eye, magenta filter on right eye) yading@10: .IP "\fBaybg\fR" 4 yading@10: .IX Item "aybg" yading@10: anaglyph yellow/blue gray yading@10: (yellow filter on left eye, blue filter on right eye) yading@10: .IP "\fBaybh\fR" 4 yading@10: .IX Item "aybh" yading@10: anaglyph yellow/blue half colored yading@10: (yellow filter on left eye, blue filter on right eye) yading@10: .IP "\fBaybc\fR" 4 yading@10: .IX Item "aybc" yading@10: anaglyph yellow/blue colored yading@10: (yellow filter on left eye, blue filter on right eye) yading@10: .IP "\fBaybd\fR" 4 yading@10: .IX Item "aybd" yading@10: anaglyph yellow/blue color optimized with the least squares projection of dubois yading@10: (yellow filter on left eye, blue filter on right eye) yading@10: .IP "\fBirl\fR" 4 yading@10: .IX Item "irl" yading@10: interleaved rows (left eye has top row, right eye starts on next row) yading@10: .IP "\fBirr\fR" 4 yading@10: .IX Item "irr" yading@10: interleaved rows (right eye has top row, left eye starts on next row) yading@10: .IP "\fBml\fR" 4 yading@10: .IX Item "ml" yading@10: mono output (left eye only) yading@10: .IP "\fBmr\fR" 4 yading@10: .IX Item "mr" yading@10: mono output (right eye only) yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBarcd\fR. yading@10: .RE yading@10: .SS "subtitles" yading@10: .IX Subsection "subtitles" yading@10: Draw subtitles on top of input video using the libass library. yading@10: .PP yading@10: To enable compilation of this filter you need to configure FFmpeg with yading@10: \&\f(CW\*(C`\-\-enable\-libass\*(C'\fR. This filter also requires a build with libavcodec and yading@10: libavformat to convert the passed subtitles file to \s-1ASS\s0 (Advanced Substation yading@10: Alpha) subtitles format. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBfilename, f\fR" 4 yading@10: .IX Item "filename, f" yading@10: Set the filename of the subtitle file to read. It must be specified. yading@10: .IP "\fBoriginal_size\fR" 4 yading@10: .IX Item "original_size" yading@10: Specify the size of the original video, the video for which the \s-1ASS\s0 file yading@10: was composed. Due to a misdesign in \s-1ASS\s0 aspect ratio arithmetic, this is yading@10: necessary to correctly scale the fonts if the aspect ratio has been changed. yading@10: .IP "\fBcharenc\fR" 4 yading@10: .IX Item "charenc" yading@10: Set subtitles input character encoding. \f(CW\*(C`subtitles\*(C'\fR filter only. Only yading@10: useful if not \s-1UTF\-8\s0. yading@10: .PP yading@10: If the first key is not specified, it is assumed that the first value yading@10: specifies the \fBfilename\fR. yading@10: .PP yading@10: For example, to render the file \fIsub.srt\fR on top of the input yading@10: video, use the command: yading@10: .PP yading@10: .Vb 1 yading@10: \& subtitles=sub.srt yading@10: .Ve yading@10: .PP yading@10: which is equivalent to: yading@10: .PP yading@10: .Vb 1 yading@10: \& subtitles=filename=sub.srt yading@10: .Ve yading@10: .SS "super2xsai" yading@10: .IX Subsection "super2xsai" yading@10: Scale the input by 2x and smooth using the Super2xSaI (Scale and yading@10: Interpolate) pixel art scaling algorithm. yading@10: .PP yading@10: Useful for enlarging pixel art images without reducing sharpness. yading@10: .SS "swapuv" yading@10: .IX Subsection "swapuv" yading@10: Swap U & V plane. yading@10: .SS "telecine" yading@10: .IX Subsection "telecine" yading@10: Apply telecine process to the video. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBfirst_field\fR" 4 yading@10: .IX Item "first_field" yading@10: .RS 4 yading@10: .PD 0 yading@10: .IP "\fBtop, t\fR" 4 yading@10: .IX Item "top, t" yading@10: .PD yading@10: top field first yading@10: .IP "\fBbottom, b\fR" 4 yading@10: .IX Item "bottom, b" yading@10: bottom field first yading@10: The default value is \f(CW\*(C`top\*(C'\fR. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBpattern\fR" 4 yading@10: .IX Item "pattern" yading@10: A string of numbers representing the pulldown pattern you wish to apply. yading@10: The default value is \f(CW23\fR. yading@10: .PP yading@10: .Vb 1 yading@10: \& Some typical patterns: yading@10: \& yading@10: \& NTSC output (30i): yading@10: \& 27.5p: 32222 yading@10: \& 24p: 23 (classic) yading@10: \& 24p: 2332 (preferred) yading@10: \& 20p: 33 yading@10: \& 18p: 334 yading@10: \& 16p: 3444 yading@10: \& yading@10: \& PAL output (25i): yading@10: \& 27.5p: 12222 yading@10: \& 24p: 222222222223 ("Euro pulldown") yading@10: \& 16.67p: 33 yading@10: \& 16p: 33333334 yading@10: .Ve yading@10: .SS "thumbnail" yading@10: .IX Subsection "thumbnail" yading@10: Select the most representative frame in a given sequence of consecutive frames. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: Set the frames batch size to analyze; in a set of \fIn\fR frames, the filter yading@10: will pick one of them, and then handle the next batch of \fIn\fR frames until yading@10: the end. Default is \f(CW100\fR. yading@10: .PP yading@10: Since the filter keeps track of the whole frames sequence, a bigger \fIn\fR yading@10: value will result in a higher memory usage, so a high value is not recommended. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Extract one picture each 50 frames: yading@10: .Sp yading@10: .Vb 1 yading@10: \& thumbnail=50 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Complete example of a thumbnail creation with \fBffmpeg\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.avi \-vf thumbnail,scale=300:200 \-frames:v 1 out.png yading@10: .Ve yading@10: .SS "tile" yading@10: .IX Subsection "tile" yading@10: Tile several successive frames together. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBlayout\fR" 4 yading@10: .IX Item "layout" yading@10: Set the grid size (i.e. the number of lines and columns) in the form yading@10: "\fIw\fRx\fIh\fR". yading@10: .IP "\fBnb_frames\fR" 4 yading@10: .IX Item "nb_frames" yading@10: Set the maximum number of frames to render in the given area. It must be less yading@10: than or equal to \fIw\fRx\fIh\fR. The default value is \f(CW0\fR, meaning all yading@10: the area will be used. yading@10: .IP "\fBmargin\fR" 4 yading@10: .IX Item "margin" yading@10: Set the outer border margin in pixels. yading@10: .IP "\fBpadding\fR" 4 yading@10: .IX Item "padding" yading@10: Set the inner border thickness (i.e. the number of pixels between frames). For yading@10: more advanced padding options (such as having different values for the edges), yading@10: refer to the pad video filter. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Produce 8x8 \s-1PNG\s0 tiles of all keyframes (\fB\-skip_frame nokey\fR) in a movie: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-skip_frame nokey \-i file.avi \-vf \*(Aqscale=128:72,tile=8x8\*(Aq \-an \-vsync 0 keyframes%03d.png yading@10: .Ve yading@10: .Sp yading@10: The \fB\-vsync 0\fR is necessary to prevent \fBffmpeg\fR from yading@10: duplicating each output frame to accomodate the originally detected frame yading@10: rate. yading@10: .IP "\(bu" 4 yading@10: Display \f(CW5\fR pictures in an area of \f(CW\*(C`3x2\*(C'\fR frames, yading@10: with \f(CW7\fR pixels between them, and \f(CW2\fR pixels of initial margin, using yading@10: mixed flat and named options: yading@10: .Sp yading@10: .Vb 1 yading@10: \& tile=3x2:nb_frames=5:padding=7:margin=2 yading@10: .Ve yading@10: .SS "tinterlace" yading@10: .IX Subsection "tinterlace" yading@10: Perform various types of temporal field interlacing. yading@10: .PP yading@10: Frames are counted starting from 1, so the first input frame is yading@10: considered odd. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Specify the mode of the interlacing. This option can also be specified yading@10: as a value alone. See below for a list of values for this option. yading@10: .Sp yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBmerge, 0\fR" 4 yading@10: .IX Item "merge, 0" yading@10: Move odd frames into the upper field, even into the lower field, yading@10: generating a double height frame at half frame rate. yading@10: .IP "\fBdrop_odd, 1\fR" 4 yading@10: .IX Item "drop_odd, 1" yading@10: Only output even frames, odd frames are dropped, generating a frame with yading@10: unchanged height at half frame rate. yading@10: .IP "\fBdrop_even, 2\fR" 4 yading@10: .IX Item "drop_even, 2" yading@10: Only output odd frames, even frames are dropped, generating a frame with yading@10: unchanged height at half frame rate. yading@10: .IP "\fBpad, 3\fR" 4 yading@10: .IX Item "pad, 3" yading@10: Expand each frame to full height, but pad alternate lines with black, yading@10: generating a frame with double height at the same input frame rate. yading@10: .IP "\fBinterleave_top, 4\fR" 4 yading@10: .IX Item "interleave_top, 4" yading@10: Interleave the upper field from odd frames with the lower field from yading@10: even frames, generating a frame with unchanged height at half frame rate. yading@10: .IP "\fBinterleave_bottom, 5\fR" 4 yading@10: .IX Item "interleave_bottom, 5" yading@10: Interleave the lower field from odd frames with the upper field from yading@10: even frames, generating a frame with unchanged height at half frame rate. yading@10: .IP "\fBinterlacex2, 6\fR" 4 yading@10: .IX Item "interlacex2, 6" yading@10: Double frame rate with unchanged height. Frames are inserted each yading@10: containing the second temporal field from the previous input frame and yading@10: the first temporal field from the next input frame. This mode relies on yading@10: the top_field_first flag. Useful for interlaced video displays with no yading@10: field synchronisation. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Numeric values are deprecated but are accepted for backward yading@10: compatibility reasons. yading@10: .Sp yading@10: Default mode is \f(CW\*(C`merge\*(C'\fR. yading@10: .RE yading@10: .IP "\fBflags\fR" 4 yading@10: .IX Item "flags" yading@10: Specify flags influencing the filter process. yading@10: .Sp yading@10: Available value for \fIflags\fR is: yading@10: .RS 4 yading@10: .IP "\fBlow_pass_filter, vlfp\fR" 4 yading@10: .IX Item "low_pass_filter, vlfp" yading@10: Enable vertical low-pass filtering in the filter. yading@10: Vertical low-pass filtering is required when creating an interlaced yading@10: destination from a progressive source which contains high-frequency yading@10: vertical detail. Filtering will reduce interlace 'twitter' and Moire yading@10: patterning. yading@10: .Sp yading@10: Vertical low-pass filtering can only be enabled for \fBmode\fR yading@10: \&\fIinterleave_top\fR and \fIinterleave_bottom\fR. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .SS "transpose" yading@10: .IX Subsection "transpose" yading@10: Transpose rows with columns in the input video and optionally flip it. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBdir\fR" 4 yading@10: .IX Item "dir" yading@10: The direction of the transpose. yading@10: .RS 4 yading@10: .IP "\fB0, 4, cclock_flip\fR" 4 yading@10: .IX Item "0, 4, cclock_flip" yading@10: Rotate by 90 degrees counterclockwise and vertically flip (default), that is: yading@10: .Sp yading@10: .Vb 3 yading@10: \& L.R L.l yading@10: \& . . \-> . . yading@10: \& l.r R.r yading@10: .Ve yading@10: .IP "\fB1, 5, clock\fR" 4 yading@10: .IX Item "1, 5, clock" yading@10: Rotate by 90 degrees clockwise, that is: yading@10: .Sp yading@10: .Vb 3 yading@10: \& L.R l.L yading@10: \& . . \-> . . yading@10: \& l.r r.R yading@10: .Ve yading@10: .IP "\fB2, 6, cclock\fR" 4 yading@10: .IX Item "2, 6, cclock" yading@10: Rotate by 90 degrees counterclockwise, that is: yading@10: .Sp yading@10: .Vb 3 yading@10: \& L.R R.r yading@10: \& . . \-> . . yading@10: \& l.r L.l yading@10: .Ve yading@10: .IP "\fB3, 7, clock_flip\fR" 4 yading@10: .IX Item "3, 7, clock_flip" yading@10: Rotate by 90 degrees clockwise and vertically flip, that is: yading@10: .Sp yading@10: .Vb 3 yading@10: \& L.R r.R yading@10: \& . . \-> . . yading@10: \& l.r l.L yading@10: .Ve yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: For values between 4\-7, the transposition is only done if the input yading@10: video geometry is portrait and not landscape. These values are yading@10: deprecated, the \f(CW\*(C`passthrough\*(C'\fR option should be used instead. yading@10: .RE yading@10: .IP "\fBpassthrough\fR" 4 yading@10: .IX Item "passthrough" yading@10: Do not apply the transposition if the input geometry matches the one yading@10: specified by the specified value. It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: Always apply transposition. yading@10: .IP "\fBportrait\fR" 4 yading@10: .IX Item "portrait" yading@10: Preserve portrait geometry (when \fIheight\fR >= \fIwidth\fR). yading@10: .IP "\fBlandscape\fR" 4 yading@10: .IX Item "landscape" yading@10: Preserve landscape geometry (when \fIwidth\fR >= \fIheight\fR). yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`none\*(C'\fR. yading@10: .RE yading@10: .PP yading@10: For example to rotate by 90 degrees clockwise and preserve portrait yading@10: layout: yading@10: .PP yading@10: .Vb 1 yading@10: \& transpose=dir=1:passthrough=portrait yading@10: .Ve yading@10: .PP yading@10: The command above can also be specified as: yading@10: .PP yading@10: .Vb 1 yading@10: \& transpose=1:portrait yading@10: .Ve yading@10: .SS "unsharp" yading@10: .IX Subsection "unsharp" yading@10: Sharpen or blur the input video. yading@10: .PP yading@10: It accepts the following parameters: yading@10: .IP "\fBluma_msize_x, lx\fR" 4 yading@10: .IX Item "luma_msize_x, lx" yading@10: .PD 0 yading@10: .IP "\fBchroma_msize_x, cx\fR" 4 yading@10: .IX Item "chroma_msize_x, cx" yading@10: .PD yading@10: Set the luma/chroma matrix horizontal size. It must be an odd integer yading@10: between 3 and 63, default value is 5. yading@10: .IP "\fBluma_msize_y, ly\fR" 4 yading@10: .IX Item "luma_msize_y, ly" yading@10: .PD 0 yading@10: .IP "\fBchroma_msize_y, cy\fR" 4 yading@10: .IX Item "chroma_msize_y, cy" yading@10: .PD yading@10: Set the luma/chroma matrix vertical size. It must be an odd integer yading@10: between 3 and 63, default value is 5. yading@10: .IP "\fBluma_amount, la\fR" 4 yading@10: .IX Item "luma_amount, la" yading@10: .PD 0 yading@10: .IP "\fBchroma_amount, ca\fR" 4 yading@10: .IX Item "chroma_amount, ca" yading@10: .PD yading@10: Set the luma/chroma effect strength. It can be a float number, yading@10: reasonable values lay between \-1.5 and 1.5. yading@10: .Sp yading@10: Negative values will blur the input video, while positive values will yading@10: sharpen it, a value of zero will disable the effect. yading@10: .Sp yading@10: Default value is 1.0 for \fBluma_amount\fR, 0.0 for yading@10: \&\fBchroma_amount\fR. yading@10: .PP yading@10: All parameters are optional and default to the yading@10: equivalent of the string '5:5:1.0:5:5:0.0'. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Apply strong luma sharpen effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply strong blur of both luma and chroma parameters: yading@10: .Sp yading@10: .Vb 1 yading@10: \& unsharp=7:7:\-2:7:7:\-2 yading@10: .Ve yading@10: .SS "vflip" yading@10: .IX Subsection "vflip" yading@10: Flip the input video vertically. yading@10: .PP yading@10: .Vb 1 yading@10: \& ffmpeg \-i in.avi \-vf "vflip" out.avi yading@10: .Ve yading@10: .SS "yadif" yading@10: .IX Subsection "yadif" yading@10: Deinterlace the input video (\*(L"yadif\*(R" means \*(L"yet another deinterlacing yading@10: filter\*(R"). yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: The interlacing mode to adopt, accepts one of the following values: yading@10: .RS 4 yading@10: .IP "\fB0, send_frame\fR" 4 yading@10: .IX Item "0, send_frame" yading@10: output 1 frame for each frame yading@10: .IP "\fB1, send_field\fR" 4 yading@10: .IX Item "1, send_field" yading@10: output 1 frame for each field yading@10: .IP "\fB2, send_frame_nospatial\fR" 4 yading@10: .IX Item "2, send_frame_nospatial" yading@10: like \f(CW\*(C`send_frame\*(C'\fR but skip spatial interlacing check yading@10: .IP "\fB3, send_field_nospatial\fR" 4 yading@10: .IX Item "3, send_field_nospatial" yading@10: like \f(CW\*(C`send_field\*(C'\fR but skip spatial interlacing check yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`send_frame\*(C'\fR. yading@10: .RE yading@10: .IP "\fBparity\fR" 4 yading@10: .IX Item "parity" yading@10: The picture field parity assumed for the input interlaced video, accepts one of yading@10: the following values: yading@10: .RS 4 yading@10: .IP "\fB0, tff\fR" 4 yading@10: .IX Item "0, tff" yading@10: assume top field first yading@10: .IP "\fB1, bff\fR" 4 yading@10: .IX Item "1, bff" yading@10: assume bottom field first yading@10: .IP "\fB\-1, auto\fR" 4 yading@10: .IX Item "-1, auto" yading@10: enable automatic detection yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`auto\*(C'\fR. yading@10: If interlacing is unknown or decoder does not export this information, yading@10: top field first will be assumed. yading@10: .RE yading@10: .IP "\fBdeint\fR" 4 yading@10: .IX Item "deint" yading@10: Specify which frames to deinterlace. Accept one of the following yading@10: values: yading@10: .RS 4 yading@10: .IP "\fB0, all\fR" 4 yading@10: .IX Item "0, all" yading@10: deinterlace all frames yading@10: .IP "\fB1, interlaced\fR" 4 yading@10: .IX Item "1, interlaced" yading@10: only deinterlace frames marked as interlaced yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`all\*(C'\fR. yading@10: .RE yading@10: .SH "VIDEO SOURCES" yading@10: .IX Header "VIDEO SOURCES" yading@10: Below is a description of the currently available video sources. yading@10: .SS "buffer" yading@10: .IX Subsection "buffer" yading@10: Buffer video frames, and make them available to the filter chain. yading@10: .PP yading@10: This source is mainly intended for a programmatic use, in particular yading@10: through the interface defined in \fIlibavfilter/vsrc_buffer.h\fR. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBvideo_size\fR" 4 yading@10: .IX Item "video_size" yading@10: Specify the size (width and height) of the buffered video frames. yading@10: .IP "\fBwidth\fR" 4 yading@10: .IX Item "width" yading@10: Input video width. yading@10: .IP "\fBheight\fR" 4 yading@10: .IX Item "height" yading@10: Input video height. yading@10: .IP "\fBpix_fmt\fR" 4 yading@10: .IX Item "pix_fmt" yading@10: A string representing the pixel format of the buffered video frames. yading@10: It may be a number corresponding to a pixel format, or a pixel format yading@10: name. yading@10: .IP "\fBtime_base\fR" 4 yading@10: .IX Item "time_base" yading@10: Specify the timebase assumed by the timestamps of the buffered frames. yading@10: .IP "\fBframe_rate\fR" 4 yading@10: .IX Item "frame_rate" yading@10: Specify the frame rate expected for the video stream. yading@10: .IP "\fBpixel_aspect, sar\fR" 4 yading@10: .IX Item "pixel_aspect, sar" yading@10: Specify the sample aspect ratio assumed by the video frames. yading@10: .IP "\fBsws_param\fR" 4 yading@10: .IX Item "sws_param" yading@10: Specify the optional parameters to be used for the scale filter which yading@10: is automatically inserted when an input change is detected in the yading@10: input size or format. yading@10: .PP yading@10: For example: yading@10: .PP yading@10: .Vb 1 yading@10: \& buffer=width=320:height=240:pix_fmt=yuv410p:time_base=1/24:sar=1 yading@10: .Ve yading@10: .PP yading@10: will instruct the source to accept video frames with size 320x240 and yading@10: with format \*(L"yuv410p\*(R", assuming 1/24 as the timestamps timebase and yading@10: square pixels (1:1 sample aspect ratio). yading@10: Since the pixel format with name \*(L"yuv410p\*(R" corresponds to the number 6 yading@10: (check the enum AVPixelFormat definition in \fIlibavutil/pixfmt.h\fR), yading@10: this example corresponds to: yading@10: .PP yading@10: .Vb 1 yading@10: \& buffer=size=320x240:pixfmt=6:time_base=1/24:pixel_aspect=1/1 yading@10: .Ve yading@10: .PP yading@10: Alternatively, the options can be specified as a flat string, but this yading@10: syntax is deprecated: yading@10: .PP yading@10: \&\fIwidth\fR:\fIheight\fR:\fIpix_fmt\fR:\fItime_base.num\fR:\fItime_base.den\fR:\fIpixel_aspect.num\fR:\fIpixel_aspect.den\fR[:\fIsws_param\fR] yading@10: .SS "cellauto" yading@10: .IX Subsection "cellauto" yading@10: Create a pattern generated by an elementary cellular automaton. yading@10: .PP yading@10: The initial state of the cellular automaton can be defined through the yading@10: \&\fBfilename\fR, and \fBpattern\fR options. If such options are yading@10: not specified an initial state is created randomly. yading@10: .PP yading@10: At each new frame a new row in the video is filled with the result of yading@10: the cellular automaton next generation. The behavior when the whole yading@10: frame is filled is defined by the \fBscroll\fR option. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBfilename, f\fR" 4 yading@10: .IX Item "filename, f" yading@10: Read the initial cellular automaton state, i.e. the starting row, from yading@10: the specified file. yading@10: In the file, each non-whitespace character is considered an alive yading@10: cell, a newline will terminate the row, and further characters in the yading@10: file will be ignored. yading@10: .IP "\fBpattern, p\fR" 4 yading@10: .IX Item "pattern, p" yading@10: Read the initial cellular automaton state, i.e. the starting row, from yading@10: the specified string. yading@10: .Sp yading@10: Each non-whitespace character in the string is considered an alive yading@10: cell, a newline will terminate the row, and further characters in the yading@10: string will be ignored. yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Set the video rate, that is the number of frames generated per second. yading@10: Default is 25. yading@10: .IP "\fBrandom_fill_ratio, ratio\fR" 4 yading@10: .IX Item "random_fill_ratio, ratio" yading@10: Set the random fill ratio for the initial cellular automaton row. It yading@10: is a floating point number value ranging from 0 to 1, defaults to yading@10: 1/PHI. yading@10: .Sp yading@10: This option is ignored when a file or a pattern is specified. yading@10: .IP "\fBrandom_seed, seed\fR" 4 yading@10: .IX Item "random_seed, seed" yading@10: Set the seed for filling randomly the initial row, must be an integer yading@10: included between 0 and \s-1UINT32_MAX\s0. If not specified, or if explicitly yading@10: set to \-1, the filter will try to use a good random seed on a best yading@10: effort basis. yading@10: .IP "\fBrule\fR" 4 yading@10: .IX Item "rule" yading@10: Set the cellular automaton rule, it is a number ranging from 0 to 255. yading@10: Default value is 110. yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Set the size of the output video. yading@10: .Sp yading@10: If \fBfilename\fR or \fBpattern\fR is specified, the size is set yading@10: by default to the width of the specified initial state row, and the yading@10: height is set to \fIwidth\fR * \s-1PHI\s0. yading@10: .Sp yading@10: If \fBsize\fR is set, it must contain the width of the specified yading@10: pattern string, and the specified pattern will be centered in the yading@10: larger row. yading@10: .Sp yading@10: If a filename or a pattern string is not specified, the size value yading@10: defaults to \*(L"320x518\*(R" (used for a randomly generated initial state). yading@10: .IP "\fBscroll\fR" 4 yading@10: .IX Item "scroll" yading@10: If set to 1, scroll the output upward when all the rows in the output yading@10: have been already filled. If set to 0, the new generated row will be yading@10: written over the top row just after the bottom row is filled. yading@10: Defaults to 1. yading@10: .IP "\fBstart_full, full\fR" 4 yading@10: .IX Item "start_full, full" yading@10: If set to 1, completely fill the output with generated rows before yading@10: outputting the first frame. yading@10: This is the default behavior, for disabling set the value to 0. yading@10: .IP "\fBstitch\fR" 4 yading@10: .IX Item "stitch" yading@10: If set to 1, stitch the left and right row edges together. yading@10: This is the default behavior, for disabling set the value to 0. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Read the initial state from \fIpattern\fR, and specify an output of yading@10: size 200x400. yading@10: .Sp yading@10: .Vb 1 yading@10: \& cellauto=f=pattern:s=200x400 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a random initial row with a width of 200 cells, with a fill yading@10: ratio of 2/3: yading@10: .Sp yading@10: .Vb 1 yading@10: \& cellauto=ratio=2/3:s=200x200 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Create a pattern generated by rule 18 starting by a single alive cell yading@10: centered on an initial row with width 100: yading@10: .Sp yading@10: .Vb 1 yading@10: \& cellauto=p=@s=100x400:full=0:rule=18 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Specify a more elaborated initial pattern: yading@10: .Sp yading@10: .Vb 1 yading@10: \& cellauto=p=\*(Aq@@ @ @@\*(Aq:s=100x400:full=0:rule=18 yading@10: .Ve yading@10: .SS "mandelbrot" yading@10: .IX Subsection "mandelbrot" yading@10: Generate a Mandelbrot set fractal, and progressively zoom towards the yading@10: point specified with \fIstart_x\fR and \fIstart_y\fR. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBend_pts\fR" 4 yading@10: .IX Item "end_pts" yading@10: Set the terminal pts value. Default value is 400. yading@10: .IP "\fBend_scale\fR" 4 yading@10: .IX Item "end_scale" yading@10: Set the terminal scale value. yading@10: Must be a floating point value. Default value is 0.3. yading@10: .IP "\fBinner\fR" 4 yading@10: .IX Item "inner" yading@10: Set the inner coloring mode, that is the algorithm used to draw the yading@10: Mandelbrot fractal internal region. yading@10: .Sp yading@10: It shall assume one of the following values: yading@10: .RS 4 yading@10: .IP "\fBblack\fR" 4 yading@10: .IX Item "black" yading@10: Set black mode. yading@10: .IP "\fBconvergence\fR" 4 yading@10: .IX Item "convergence" yading@10: Show time until convergence. yading@10: .IP "\fBmincol\fR" 4 yading@10: .IX Item "mincol" yading@10: Set color based on point closest to the origin of the iterations. yading@10: .IP "\fBperiod\fR" 4 yading@10: .IX Item "period" yading@10: Set period mode. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fImincol\fR. yading@10: .RE yading@10: .IP "\fBbailout\fR" 4 yading@10: .IX Item "bailout" yading@10: Set the bailout value. Default value is 10.0. yading@10: .IP "\fBmaxiter\fR" 4 yading@10: .IX Item "maxiter" yading@10: Set the maximum of iterations performed by the rendering yading@10: algorithm. Default value is 7189. yading@10: .IP "\fBouter\fR" 4 yading@10: .IX Item "outer" yading@10: Set outer coloring mode. yading@10: It shall assume one of following values: yading@10: .RS 4 yading@10: .IP "\fBiteration_count\fR" 4 yading@10: .IX Item "iteration_count" yading@10: Set iteration cound mode. yading@10: .IP "\fBnormalized_iteration_count\fR" 4 yading@10: .IX Item "normalized_iteration_count" yading@10: set normalized iteration count mode. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fInormalized_iteration_count\fR. yading@10: .RE yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Set frame rate, expressed as number of frames per second. Default yading@10: value is \*(L"25\*(R". yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Set frame size. Default value is \*(L"640x480\*(R". yading@10: .IP "\fBstart_scale\fR" 4 yading@10: .IX Item "start_scale" yading@10: Set the initial scale value. Default value is 3.0. yading@10: .IP "\fBstart_x\fR" 4 yading@10: .IX Item "start_x" yading@10: Set the initial x position. Must be a floating point value between yading@10: \&\-100 and 100. Default value is \-0.743643887037158704752191506114774. yading@10: .IP "\fBstart_y\fR" 4 yading@10: .IX Item "start_y" yading@10: Set the initial y position. Must be a floating point value between yading@10: \&\-100 and 100. Default value is \-0.131825904205311970493132056385139. yading@10: .SS "mptestsrc" yading@10: .IX Subsection "mptestsrc" yading@10: Generate various test patterns, as generated by the MPlayer test filter. yading@10: .PP yading@10: The size of the generated video is fixed, and is 256x256. yading@10: This source is useful in particular for testing encoding features. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Specify the frame rate of the sourced video, as the number of frames yading@10: generated per second. It has to be a string in the format yading@10: \&\fIframe_rate_num\fR/\fIframe_rate_den\fR, an integer number, a float yading@10: number or a valid video frame rate abbreviation. The default value is yading@10: \&\*(L"25\*(R". yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Set the video duration of the sourced video. The accepted syntax is: yading@10: .Sp yading@10: .Vb 2 yading@10: \& [\-]HH:MM:SS[.m...] yading@10: \& [\-]S+[.m...] yading@10: .Ve yading@10: .Sp yading@10: See also the function \f(CW\*(C`av_parse_time()\*(C'\fR. yading@10: .Sp yading@10: If not specified, or the expressed duration is negative, the video is yading@10: supposed to be generated forever. yading@10: .IP "\fBtest, t\fR" 4 yading@10: .IX Item "test, t" yading@10: Set the number or the name of the test to perform. Supported tests are: yading@10: .RS 4 yading@10: .IP "\fBdc_luma\fR" 4 yading@10: .IX Item "dc_luma" yading@10: .PD 0 yading@10: .IP "\fBdc_chroma\fR" 4 yading@10: .IX Item "dc_chroma" yading@10: .IP "\fBfreq_luma\fR" 4 yading@10: .IX Item "freq_luma" yading@10: .IP "\fBfreq_chroma\fR" 4 yading@10: .IX Item "freq_chroma" yading@10: .IP "\fBamp_luma\fR" 4 yading@10: .IX Item "amp_luma" yading@10: .IP "\fBamp_chroma\fR" 4 yading@10: .IX Item "amp_chroma" yading@10: .IP "\fBcbp\fR" 4 yading@10: .IX Item "cbp" yading@10: .IP "\fBmv\fR" 4 yading@10: .IX Item "mv" yading@10: .IP "\fBring1\fR" 4 yading@10: .IX Item "ring1" yading@10: .IP "\fBring2\fR" 4 yading@10: .IX Item "ring2" yading@10: .IP "\fBall\fR" 4 yading@10: .IX Item "all" yading@10: .RE yading@10: .RS 4 yading@10: .PD yading@10: .Sp yading@10: Default value is \*(L"all\*(R", which will cycle through the list of all tests. yading@10: .RE yading@10: .PP yading@10: For example the following: yading@10: .PP yading@10: .Vb 1 yading@10: \& testsrc=t=dc_luma yading@10: .Ve yading@10: .PP yading@10: will generate a \*(L"dc_luma\*(R" test pattern. yading@10: .SS "frei0r_src" yading@10: .IX Subsection "frei0r_src" yading@10: Provide a frei0r source. yading@10: .PP yading@10: To enable compilation of this filter you need to install the frei0r yading@10: header and configure FFmpeg with \f(CW\*(C`\-\-enable\-frei0r\*(C'\fR. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBsize\fR" 4 yading@10: .IX Item "size" yading@10: The size of the video to generate, may be a string of the form yading@10: \&\fIwidth\fRx\fIheight\fR or a frame size abbreviation. yading@10: .IP "\fBframerate\fR" 4 yading@10: .IX Item "framerate" yading@10: Framerate of the generated video, may be a string of the form yading@10: \&\fInum\fR/\fIden\fR or a frame rate abbreviation. yading@10: .IP "\fBfilter_name\fR" 4 yading@10: .IX Item "filter_name" yading@10: The name to the frei0r source to load. For more information regarding frei0r and yading@10: how to set the parameters read the section frei0r in the description of yading@10: the video filters. yading@10: .IP "\fBfilter_params\fR" 4 yading@10: .IX Item "filter_params" yading@10: A '|'\-separated list of parameters to pass to the frei0r source. yading@10: .PP yading@10: For example, to generate a frei0r partik0l source with size 200x200 yading@10: and frame rate 10 which is overlayed on the overlay filter main input: yading@10: .PP yading@10: .Vb 1 yading@10: \& frei0r_src=size=200x200:framerate=10:filter_name=partik0l:filter_params=1234 [overlay]; [in][overlay] overlay yading@10: .Ve yading@10: .SS "life" yading@10: .IX Subsection "life" yading@10: Generate a life pattern. yading@10: .PP yading@10: This source is based on a generalization of John Conway's life game. yading@10: .PP yading@10: The sourced input represents a life grid, each pixel represents a cell yading@10: which can be in one of two possible states, alive or dead. Every cell yading@10: interacts with its eight neighbours, which are the cells that are yading@10: horizontally, vertically, or diagonally adjacent. yading@10: .PP yading@10: At each interaction the grid evolves according to the adopted rule, yading@10: which specifies the number of neighbor alive cells which will make a yading@10: cell stay alive or born. The \fBrule\fR option allows to specify yading@10: the rule to adopt. yading@10: .PP yading@10: This source accepts the following options: yading@10: .IP "\fBfilename, f\fR" 4 yading@10: .IX Item "filename, f" yading@10: Set the file from which to read the initial grid state. In the file, yading@10: each non-whitespace character is considered an alive cell, and newline yading@10: is used to delimit the end of each row. yading@10: .Sp yading@10: If this option is not specified, the initial grid is generated yading@10: randomly. yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Set the video rate, that is the number of frames generated per second. yading@10: Default is 25. yading@10: .IP "\fBrandom_fill_ratio, ratio\fR" 4 yading@10: .IX Item "random_fill_ratio, ratio" yading@10: Set the random fill ratio for the initial random grid. It is a yading@10: floating point number value ranging from 0 to 1, defaults to 1/PHI. yading@10: It is ignored when a file is specified. yading@10: .IP "\fBrandom_seed, seed\fR" 4 yading@10: .IX Item "random_seed, seed" yading@10: Set the seed for filling the initial random grid, must be an integer yading@10: included between 0 and \s-1UINT32_MAX\s0. If not specified, or if explicitly yading@10: set to \-1, the filter will try to use a good random seed on a best yading@10: effort basis. yading@10: .IP "\fBrule\fR" 4 yading@10: .IX Item "rule" yading@10: Set the life rule. yading@10: .Sp yading@10: A rule can be specified with a code of the kind "S\fI\s-1NS\s0\fR/B\fI\s-1NB\s0\fR", yading@10: where \fI\s-1NS\s0\fR and \fI\s-1NB\s0\fR are sequences of numbers in the range 0\-8, yading@10: \&\fI\s-1NS\s0\fR specifies the number of alive neighbor cells which make a yading@10: live cell stay alive, and \fI\s-1NB\s0\fR the number of alive neighbor cells yading@10: which make a dead cell to become alive (i.e. to \*(L"born\*(R"). yading@10: \&\*(L"s\*(R" and \*(L"b\*(R" can be used in place of \*(L"S\*(R" and \*(L"B\*(R", respectively. yading@10: .Sp yading@10: Alternatively a rule can be specified by an 18\-bits integer. The 9 yading@10: high order bits are used to encode the next cell state if it is alive yading@10: for each number of neighbor alive cells, the low order bits specify yading@10: the rule for \*(L"borning\*(R" new cells. Higher order bits encode for an yading@10: higher number of neighbor cells. yading@10: For example the number 6153 = \f(CW\*(C`(12<<9)+9\*(C'\fR specifies a stay alive yading@10: rule of 12 and a born rule of 9, which corresponds to \*(L"S23/B03\*(R". yading@10: .Sp yading@10: Default value is \*(L"S23/B3\*(R", which is the original Conway's game of life yading@10: rule, and will keep a cell alive if it has 2 or 3 neighbor alive yading@10: cells, and will born a new cell if there are three alive cells around yading@10: a dead cell. yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Set the size of the output video. yading@10: .Sp yading@10: If \fBfilename\fR is specified, the size is set by default to the yading@10: same size of the input file. If \fBsize\fR is set, it must contain yading@10: the size specified in the input file, and the initial grid defined in yading@10: that file is centered in the larger resulting area. yading@10: .Sp yading@10: If a filename is not specified, the size value defaults to \*(L"320x240\*(R" yading@10: (used for a randomly generated initial grid). yading@10: .IP "\fBstitch\fR" 4 yading@10: .IX Item "stitch" yading@10: If set to 1, stitch the left and right grid edges together, and the yading@10: top and bottom edges also. Defaults to 1. yading@10: .IP "\fBmold\fR" 4 yading@10: .IX Item "mold" yading@10: Set cell mold speed. If set, a dead cell will go from \fBdeath_color\fR to yading@10: \&\fBmold_color\fR with a step of \fBmold\fR. \fBmold\fR can have a yading@10: value from 0 to 255. yading@10: .IP "\fBlife_color\fR" 4 yading@10: .IX Item "life_color" yading@10: Set the color of living (or new born) cells. yading@10: .IP "\fBdeath_color\fR" 4 yading@10: .IX Item "death_color" yading@10: Set the color of dead cells. If \fBmold\fR is set, this is the first color yading@10: used to represent a dead cell. yading@10: .IP "\fBmold_color\fR" 4 yading@10: .IX Item "mold_color" yading@10: Set mold color, for definitely dead and moldy cells. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Read a grid from \fIpattern\fR, and center it on a grid of size yading@10: 300x300 pixels: yading@10: .Sp yading@10: .Vb 1 yading@10: \& life=f=pattern:s=300x300 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate a random grid of size 200x200, with a fill ratio of 2/3: yading@10: .Sp yading@10: .Vb 1 yading@10: \& life=ratio=2/3:s=200x200 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Specify a custom rule for evolving a randomly generated grid: yading@10: .Sp yading@10: .Vb 1 yading@10: \& life=rule=S14/B34 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Full example with slow death effect (mold) using \fBffplay\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay \-f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=16 yading@10: .Ve yading@10: .SS "color, nullsrc, rgbtestsrc, smptebars, smptehdbars, testsrc" yading@10: .IX Subsection "color, nullsrc, rgbtestsrc, smptebars, smptehdbars, testsrc" yading@10: The \f(CW\*(C`color\*(C'\fR source provides an uniformly colored input. yading@10: .PP yading@10: The \f(CW\*(C`nullsrc\*(C'\fR source returns unprocessed video frames. It is yading@10: mainly useful to be employed in analysis / debugging tools, or as the yading@10: source for filters which ignore the input data. yading@10: .PP yading@10: The \f(CW\*(C`rgbtestsrc\*(C'\fR source generates an \s-1RGB\s0 test pattern useful for yading@10: detecting \s-1RGB\s0 vs \s-1BGR\s0 issues. You should see a red, green and blue yading@10: stripe from top to bottom. yading@10: .PP yading@10: The \f(CW\*(C`smptebars\*(C'\fR source generates a color bars pattern, based on yading@10: the \s-1SMPTE\s0 Engineering Guideline \s-1EG\s0 1\-1990. yading@10: .PP yading@10: The \f(CW\*(C`smptehdbars\*(C'\fR source generates a color bars pattern, based on yading@10: the \s-1SMPTE\s0 \s-1RP\s0 219\-2002. yading@10: .PP yading@10: The \f(CW\*(C`testsrc\*(C'\fR source generates a test video pattern, showing a yading@10: color pattern, a scrolling gradient and a timestamp. This is mainly yading@10: intended for testing purposes. yading@10: .PP yading@10: The sources accept the following options: yading@10: .IP "\fBcolor, c\fR" 4 yading@10: .IX Item "color, c" yading@10: Specify the color of the source, only used in the \f(CW\*(C`color\*(C'\fR yading@10: source. It can be the name of a color (case insensitive match) or a yading@10: 0xRRGGBB[\s-1AA\s0] sequence, possibly followed by an alpha specifier. The yading@10: default value is \*(L"black\*(R". yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Specify the size of the sourced video, it may be a string of the form yading@10: \&\fIwidth\fRx\fIheight\fR, or the name of a size abbreviation. The yading@10: default value is \*(L"320x240\*(R". yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Specify the frame rate of the sourced video, as the number of frames yading@10: generated per second. It has to be a string in the format yading@10: \&\fIframe_rate_num\fR/\fIframe_rate_den\fR, an integer number, a float yading@10: number or a valid video frame rate abbreviation. The default value is yading@10: \&\*(L"25\*(R". yading@10: .IP "\fBsar\fR" 4 yading@10: .IX Item "sar" yading@10: Set the sample aspect ratio of the sourced video. yading@10: .IP "\fBduration, d\fR" 4 yading@10: .IX Item "duration, d" yading@10: Set the video duration of the sourced video. The accepted syntax is: yading@10: .Sp yading@10: .Vb 2 yading@10: \& [\-]HH[:MM[:SS[.m...]]] yading@10: \& [\-]S+[.m...] yading@10: .Ve yading@10: .Sp yading@10: See also the function \f(CW\*(C`av_parse_time()\*(C'\fR. yading@10: .Sp yading@10: If not specified, or the expressed duration is negative, the video is yading@10: supposed to be generated forever. yading@10: .IP "\fBdecimals, n\fR" 4 yading@10: .IX Item "decimals, n" yading@10: Set the number of decimals to show in the timestamp, only used in the yading@10: \&\f(CW\*(C`testsrc\*(C'\fR source. yading@10: .Sp yading@10: The displayed timestamp value will correspond to the original yading@10: timestamp value multiplied by the power of 10 of the specified yading@10: value. Default value is 0. yading@10: .PP yading@10: For example the following: yading@10: .PP yading@10: .Vb 1 yading@10: \& testsrc=duration=5.3:size=qcif:rate=10 yading@10: .Ve yading@10: .PP yading@10: will generate a video with a duration of 5.3 seconds, with size yading@10: 176x144 and a frame rate of 10 frames per second. yading@10: .PP yading@10: The following graph description will generate a red source yading@10: with an opacity of 0.2, with size \*(L"qcif\*(R" and a frame rate of 10 yading@10: frames per second. yading@10: .PP yading@10: .Vb 1 yading@10: \& color=c=red@0.2:s=qcif:r=10 yading@10: .Ve yading@10: .PP yading@10: If the input content is to be ignored, \f(CW\*(C`nullsrc\*(C'\fR can be used. The yading@10: following command generates noise in the luminance plane by employing yading@10: the \f(CW\*(C`geq\*(C'\fR filter: yading@10: .PP yading@10: .Vb 1 yading@10: \& nullsrc=s=256x256, geq=random(1)*255:128:128 yading@10: .Ve yading@10: .SH "VIDEO SINKS" yading@10: .IX Header "VIDEO SINKS" yading@10: Below is a description of the currently available video sinks. yading@10: .SS "buffersink" yading@10: .IX Subsection "buffersink" yading@10: Buffer video frames, and make them available to the end of the filter yading@10: graph. yading@10: .PP yading@10: This sink is mainly intended for a programmatic use, in particular yading@10: through the interface defined in \fIlibavfilter/buffersink.h\fR yading@10: or the options system. yading@10: .PP yading@10: It accepts a pointer to an AVBufferSinkContext structure, which yading@10: defines the incoming buffers' formats, to be passed as the opaque yading@10: parameter to \f(CW\*(C`avfilter_init_filter\*(C'\fR for initialization. yading@10: .SS "nullsink" yading@10: .IX Subsection "nullsink" yading@10: Null video sink, do absolutely nothing with the input video. It is yading@10: mainly useful as a template and to be employed in analysis / debugging yading@10: tools. yading@10: .SH "MULTIMEDIA FILTERS" yading@10: .IX Header "MULTIMEDIA FILTERS" yading@10: Below is a description of the currently available multimedia filters. yading@10: .SS "aperms, perms" yading@10: .IX Subsection "aperms, perms" yading@10: Set read/write permissions for the output frames. yading@10: .PP yading@10: These filters are mainly aimed at developers to test direct path in the yading@10: following filter in the filtergraph. yading@10: .PP yading@10: The filters accept the following options: yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Select the permissions mode. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBnone\fR" 4 yading@10: .IX Item "none" yading@10: Do nothing. This is the default. yading@10: .IP "\fBro\fR" 4 yading@10: .IX Item "ro" yading@10: Set all the output frames read-only. yading@10: .IP "\fBrw\fR" 4 yading@10: .IX Item "rw" yading@10: Set all the output frames directly writable. yading@10: .IP "\fBtoggle\fR" 4 yading@10: .IX Item "toggle" yading@10: Make the frame read-only if writable, and writable if read-only. yading@10: .IP "\fBrandom\fR" 4 yading@10: .IX Item "random" yading@10: Set each output frame read-only or writable randomly. yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBseed\fR" 4 yading@10: .IX Item "seed" yading@10: Set the seed for the \fIrandom\fR mode, must be an integer included between yading@10: \&\f(CW0\fR and \f(CW\*(C`UINT32_MAX\*(C'\fR. If not specified, or if explicitly set to yading@10: \&\f(CW\*(C`\-1\*(C'\fR, the filter will try to use a good random seed on a best effort yading@10: basis. yading@10: .PP yading@10: Note: in case of auto-inserted filter between the permission filter and the yading@10: following one, the permission might not be received as expected in that yading@10: following filter. Inserting a format or aformat filter before the yading@10: perms/aperms filter can avoid this problem. yading@10: .SS "aselect, select" yading@10: .IX Subsection "aselect, select" yading@10: Select frames to pass in output. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBexpr, e\fR" 4 yading@10: .IX Item "expr, e" yading@10: Set expression, which is evaluated for each input frame. yading@10: .Sp yading@10: If the expression is evaluated to zero, the frame is discarded. yading@10: .Sp yading@10: If the evaluation result is negative or NaN, the frame is sent to the yading@10: first output; otherwise it is sent to the output with index yading@10: \&\f(CW\*(C`ceil(val)\-1\*(C'\fR, assuming that the input index starts from 0. yading@10: .Sp yading@10: For example a value of \f(CW1.2\fR corresponds to the output with index yading@10: \&\f(CW\*(C`ceil(1.2)\-1 = 2\-1 = 1\*(C'\fR, that is the second output. yading@10: .IP "\fBoutputs, n\fR" 4 yading@10: .IX Item "outputs, n" yading@10: Set the number of outputs. The output to which to send the selected yading@10: frame is based on the result of the evaluation. Default value is 1. yading@10: .PP yading@10: The expression can contain the following constants: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: the sequential number of the filtered frame, starting from 0 yading@10: .IP "\fBselected_n\fR" 4 yading@10: .IX Item "selected_n" yading@10: the sequential number of the selected frame, starting from 0 yading@10: .IP "\fBprev_selected_n\fR" 4 yading@10: .IX Item "prev_selected_n" yading@10: the sequential number of the last selected frame, \s-1NAN\s0 if undefined yading@10: .IP "\fB\s-1TB\s0\fR" 4 yading@10: .IX Item "TB" yading@10: timebase of the input timestamps yading@10: .IP "\fBpts\fR" 4 yading@10: .IX Item "pts" yading@10: the \s-1PTS\s0 (Presentation TimeStamp) of the filtered video frame, yading@10: expressed in \fI\s-1TB\s0\fR units, \s-1NAN\s0 if undefined yading@10: .IP "\fBt\fR" 4 yading@10: .IX Item "t" yading@10: the \s-1PTS\s0 (Presentation TimeStamp) of the filtered video frame, yading@10: expressed in seconds, \s-1NAN\s0 if undefined yading@10: .IP "\fBprev_pts\fR" 4 yading@10: .IX Item "prev_pts" yading@10: the \s-1PTS\s0 of the previously filtered video frame, \s-1NAN\s0 if undefined yading@10: .IP "\fBprev_selected_pts\fR" 4 yading@10: .IX Item "prev_selected_pts" yading@10: the \s-1PTS\s0 of the last previously filtered video frame, \s-1NAN\s0 if undefined yading@10: .IP "\fBprev_selected_t\fR" 4 yading@10: .IX Item "prev_selected_t" yading@10: the \s-1PTS\s0 of the last previously selected video frame, \s-1NAN\s0 if undefined yading@10: .IP "\fBstart_pts\fR" 4 yading@10: .IX Item "start_pts" yading@10: the \s-1PTS\s0 of the first video frame in the video, \s-1NAN\s0 if undefined yading@10: .IP "\fBstart_t\fR" 4 yading@10: .IX Item "start_t" yading@10: the time of the first video frame in the video, \s-1NAN\s0 if undefined yading@10: .IP "\fBpict_type\fR \fI(video only)\fR" 4 yading@10: .IX Item "pict_type (video only)" yading@10: the type of the filtered frame, can assume one of the following yading@10: values: yading@10: .RS 4 yading@10: .IP "\fBI\fR" 4 yading@10: .IX Item "I" yading@10: .PD 0 yading@10: .IP "\fBP\fR" 4 yading@10: .IX Item "P" yading@10: .IP "\fBB\fR" 4 yading@10: .IX Item "B" yading@10: .IP "\fBS\fR" 4 yading@10: .IX Item "S" yading@10: .IP "\fB\s-1SI\s0\fR" 4 yading@10: .IX Item "SI" yading@10: .IP "\fB\s-1SP\s0\fR" 4 yading@10: .IX Item "SP" yading@10: .IP "\fB\s-1BI\s0\fR" 4 yading@10: .IX Item "BI" yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBinterlace_type\fR \fI(video only)\fR" 4 yading@10: .IX Item "interlace_type (video only)" yading@10: .PD yading@10: the frame interlace type, can assume one of the following values: yading@10: .RS 4 yading@10: .IP "\fB\s-1PROGRESSIVE\s0\fR" 4 yading@10: .IX Item "PROGRESSIVE" yading@10: the frame is progressive (not interlaced) yading@10: .IP "\fB\s-1TOPFIRST\s0\fR" 4 yading@10: .IX Item "TOPFIRST" yading@10: the frame is top-field-first yading@10: .IP "\fB\s-1BOTTOMFIRST\s0\fR" 4 yading@10: .IX Item "BOTTOMFIRST" yading@10: the frame is bottom-field-first yading@10: .RE yading@10: .RS 4 yading@10: .RE yading@10: .IP "\fBconsumed_sample_n\fR \fI(audio only)\fR" 4 yading@10: .IX Item "consumed_sample_n (audio only)" yading@10: the number of selected samples before the current frame yading@10: .IP "\fBsamples_n\fR \fI(audio only)\fR" 4 yading@10: .IX Item "samples_n (audio only)" yading@10: the number of samples in the current frame yading@10: .IP "\fBsample_rate\fR \fI(audio only)\fR" 4 yading@10: .IX Item "sample_rate (audio only)" yading@10: the input sample rate yading@10: .IP "\fBkey\fR" 4 yading@10: .IX Item "key" yading@10: 1 if the filtered frame is a key-frame, 0 otherwise yading@10: .IP "\fBpos\fR" 4 yading@10: .IX Item "pos" yading@10: the position in the file of the filtered frame, \-1 if the information yading@10: is not available (e.g. for synthetic video) yading@10: .IP "\fBscene\fR \fI(video only)\fR" 4 yading@10: .IX Item "scene (video only)" yading@10: value between 0 and 1 to indicate a new scene; a low value reflects a low yading@10: probability for the current frame to introduce a new scene, while a higher yading@10: value means the current frame is more likely to be one (see the example below) yading@10: .PP yading@10: The default value of the select expression is \*(L"1\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Select all frames in input: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select yading@10: .Ve yading@10: .Sp yading@10: The example above is the same as: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Skip all frames: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=0 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Select only I\-frames: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=\*(Aqeq(pict_type\e,I)\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Select one frame every 100: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=\*(Aqnot(mod(n\e,100))\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Select only frames contained in the 10\-20 time interval: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=\*(Aqgte(t\e,10)*lte(t\e,20)\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Select only I frames contained in the 10\-20 time interval: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=\*(Aqgte(t\e,10)*lte(t\e,20)*eq(pict_type\e,I)\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Select frames with a minimum distance of 10 seconds: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=\*(Aqisnan(prev_selected_t)+gte(t\-prev_selected_t\e,10)\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Use aselect to select only audio frames with samples number > 100: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aselect=\*(Aqgt(samples_n\e,100)\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Create a mosaic of the first scenes: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i video.avi \-vf select=\*(Aqgt(scene\e,0.4)\*(Aq,scale=160:120,tile \-frames:v 1 preview.png yading@10: .Ve yading@10: .Sp yading@10: Comparing \fIscene\fR against a value between 0.3 and 0.5 is generally a sane yading@10: choice. yading@10: .IP "\(bu" 4 yading@10: Send even and odd frames to separate outputs, and compose them: yading@10: .Sp yading@10: .Vb 1 yading@10: \& select=n=2:e=\*(Aqmod(n, 2)+1\*(Aq [odd][even]; [odd] pad=h=2*ih [tmp]; [tmp][even] overlay=y=h yading@10: .Ve yading@10: .SS "asendcmd, sendcmd" yading@10: .IX Subsection "asendcmd, sendcmd" yading@10: Send commands to filters in the filtergraph. yading@10: .PP yading@10: These filters read commands to be sent to other filters in the yading@10: filtergraph. yading@10: .PP yading@10: \&\f(CW\*(C`asendcmd\*(C'\fR must be inserted between two audio filters, yading@10: \&\f(CW\*(C`sendcmd\*(C'\fR must be inserted between two video filters, but apart yading@10: from that they act the same way. yading@10: .PP yading@10: The specification of commands can be provided in the filter arguments yading@10: with the \fIcommands\fR option, or in a file specified by the yading@10: \&\fIfilename\fR option. yading@10: .PP yading@10: These filters accept the following options: yading@10: .IP "\fBcommands, c\fR" 4 yading@10: .IX Item "commands, c" yading@10: Set the commands to be read and sent to the other filters. yading@10: .IP "\fBfilename, f\fR" 4 yading@10: .IX Item "filename, f" yading@10: Set the filename of the commands to be read and sent to the other yading@10: filters. yading@10: .PP yading@10: \fICommands syntax\fR yading@10: .IX Subsection "Commands syntax" yading@10: .PP yading@10: A commands description consists of a sequence of interval yading@10: specifications, comprising a list of commands to be executed when a yading@10: particular event related to that interval occurs. The occurring event yading@10: is typically the current frame time entering or leaving a given time yading@10: interval. yading@10: .PP yading@10: An interval is specified by the following syntax: yading@10: .PP yading@10: .Vb 1 yading@10: \& [\-] ; yading@10: .Ve yading@10: .PP yading@10: The time interval is specified by the \fI\s-1START\s0\fR and \fI\s-1END\s0\fR times. yading@10: \&\fI\s-1END\s0\fR is optional and defaults to the maximum time. yading@10: .PP yading@10: The current frame time is considered within the specified interval if yading@10: it is included in the interval [\fI\s-1START\s0\fR, \fI\s-1END\s0\fR), that is when yading@10: the time is greater or equal to \fI\s-1START\s0\fR and is lesser than yading@10: \&\fI\s-1END\s0\fR. yading@10: .PP yading@10: \&\fI\s-1COMMANDS\s0\fR consists of a sequence of one or more command yading@10: specifications, separated by \*(L",\*(R", relating to that interval. The yading@10: syntax of a command specification is given by: yading@10: .PP yading@10: .Vb 1 yading@10: \& [] yading@10: .Ve yading@10: .PP yading@10: \&\fI\s-1FLAGS\s0\fR is optional and specifies the type of events relating to yading@10: the time interval which enable sending the specified command, and must yading@10: be a non-null sequence of identifier flags separated by \*(L"+\*(R" or \*(L"|\*(R" and yading@10: enclosed between \*(L"[\*(R" and \*(L"]\*(R". yading@10: .PP yading@10: The following flags are recognized: yading@10: .IP "\fBenter\fR" 4 yading@10: .IX Item "enter" yading@10: The command is sent when the current frame timestamp enters the yading@10: specified interval. In other words, the command is sent when the yading@10: previous frame timestamp was not in the given interval, and the yading@10: current is. yading@10: .IP "\fBleave\fR" 4 yading@10: .IX Item "leave" yading@10: The command is sent when the current frame timestamp leaves the yading@10: specified interval. In other words, the command is sent when the yading@10: previous frame timestamp was in the given interval, and the yading@10: current is not. yading@10: .PP yading@10: If \fI\s-1FLAGS\s0\fR is not specified, a default value of \f(CW\*(C`[enter]\*(C'\fR is yading@10: assumed. yading@10: .PP yading@10: \&\fI\s-1TARGET\s0\fR specifies the target of the command, usually the name of yading@10: the filter class or a specific filter instance name. yading@10: .PP yading@10: \&\fI\s-1COMMAND\s0\fR specifies the name of the command for the target filter. yading@10: .PP yading@10: \&\fI\s-1ARG\s0\fR is optional and specifies the optional list of argument for yading@10: the given \fI\s-1COMMAND\s0\fR. yading@10: .PP yading@10: Between one interval specification and another, whitespaces, or yading@10: sequences of characters starting with \f(CW\*(C`#\*(C'\fR until the end of line, yading@10: are ignored and can be used to annotate comments. yading@10: .PP yading@10: A simplified \s-1BNF\s0 description of the commands specification syntax yading@10: follows: yading@10: .PP yading@10: .Vb 6 yading@10: \& ::= "enter" | "leave" yading@10: \& ::= [(+|"|")] yading@10: \& ::= ["[" "]"] [] yading@10: \& ::= [,] yading@10: \& ::= [\-] yading@10: \& ::= [;] yading@10: .Ve yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Specify audio tempo change at second 4: yading@10: .Sp yading@10: .Vb 1 yading@10: \& asendcmd=c=\*(Aq4.0 atempo tempo 1.5\*(Aq,atempo yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Specify a list of drawtext and hue commands in a file. yading@10: .Sp yading@10: .Vb 3 yading@10: \& # show text in the interval 5\-10 yading@10: \& 5.0\-10.0 [enter] drawtext reinit \*(Aqfontfile=FreeSerif.ttf:text=hello world\*(Aq, yading@10: \& [leave] drawtext reinit \*(Aqfontfile=FreeSerif.ttf:text=\*(Aq; yading@10: \& yading@10: \& # desaturate the image in the interval 15\-20 yading@10: \& 15.0\-20.0 [enter] hue s 0, yading@10: \& [enter] drawtext reinit \*(Aqfontfile=FreeSerif.ttf:text=nocolor\*(Aq, yading@10: \& [leave] hue s 1, yading@10: \& [leave] drawtext reinit \*(Aqfontfile=FreeSerif.ttf:text=color\*(Aq; yading@10: \& yading@10: \& # apply an exponential saturation fade\-out effect, starting from time 25 yading@10: \& 25 [enter] hue s exp(25\-t) yading@10: .Ve yading@10: .Sp yading@10: A filtergraph allowing to read and process the above command list yading@10: stored in a file \fItest.cmd\fR, can be specified with: yading@10: .Sp yading@10: .Vb 1 yading@10: \& sendcmd=f=test.cmd,drawtext=fontfile=FreeSerif.ttf:text=\*(Aq\*(Aq,hue yading@10: .Ve yading@10: .SS "asetpts, setpts" yading@10: .IX Subsection "asetpts, setpts" yading@10: Change the \s-1PTS\s0 (presentation timestamp) of the input frames. yading@10: .PP yading@10: \&\f(CW\*(C`asetpts\*(C'\fR works on audio frames, \f(CW\*(C`setpts\*(C'\fR on video frames. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBexpr\fR" 4 yading@10: .IX Item "expr" yading@10: The expression which is evaluated for each frame to construct its timestamp. yading@10: .PP yading@10: The expression is evaluated through the eval \s-1API\s0 and can contain the following yading@10: constants: yading@10: .IP "\fB\s-1FRAME_RATE\s0\fR" 4 yading@10: .IX Item "FRAME_RATE" yading@10: frame rate, only defined for constant frame-rate video yading@10: .IP "\fB\s-1PTS\s0\fR" 4 yading@10: .IX Item "PTS" yading@10: the presentation timestamp in input yading@10: .IP "\fBN\fR" 4 yading@10: .IX Item "N" yading@10: the count of the input frame, starting from 0. yading@10: .IP "\fB\s-1NB_CONSUMED_SAMPLES\s0\fR" 4 yading@10: .IX Item "NB_CONSUMED_SAMPLES" yading@10: the number of consumed samples, not including the current frame (only yading@10: audio) yading@10: .IP "\fB\s-1NB_SAMPLES\s0\fR" 4 yading@10: .IX Item "NB_SAMPLES" yading@10: the number of samples in the current frame (only audio) yading@10: .IP "\fB\s-1SAMPLE_RATE\s0\fR" 4 yading@10: .IX Item "SAMPLE_RATE" yading@10: audio sample rate yading@10: .IP "\fB\s-1STARTPTS\s0\fR" 4 yading@10: .IX Item "STARTPTS" yading@10: the \s-1PTS\s0 of the first frame yading@10: .IP "\fB\s-1STARTT\s0\fR" 4 yading@10: .IX Item "STARTT" yading@10: the time in seconds of the first frame yading@10: .IP "\fB\s-1INTERLACED\s0\fR" 4 yading@10: .IX Item "INTERLACED" yading@10: tell if the current frame is interlaced yading@10: .IP "\fBT\fR" 4 yading@10: .IX Item "T" yading@10: the time in seconds of the current frame yading@10: .IP "\fB\s-1TB\s0\fR" 4 yading@10: .IX Item "TB" yading@10: the time base yading@10: .IP "\fB\s-1POS\s0\fR" 4 yading@10: .IX Item "POS" yading@10: original position in the file of the frame, or undefined if undefined yading@10: for the current frame yading@10: .IP "\fB\s-1PREV_INPTS\s0\fR" 4 yading@10: .IX Item "PREV_INPTS" yading@10: previous input \s-1PTS\s0 yading@10: .IP "\fB\s-1PREV_INT\s0\fR" 4 yading@10: .IX Item "PREV_INT" yading@10: previous input time in seconds yading@10: .IP "\fB\s-1PREV_OUTPTS\s0\fR" 4 yading@10: .IX Item "PREV_OUTPTS" yading@10: previous output \s-1PTS\s0 yading@10: .IP "\fB\s-1PREV_OUTT\s0\fR" 4 yading@10: .IX Item "PREV_OUTT" yading@10: previous output time in seconds yading@10: .IP "\fB\s-1RTCTIME\s0\fR" 4 yading@10: .IX Item "RTCTIME" yading@10: wallclock (\s-1RTC\s0) time in microseconds. This is deprecated, use \fItime\fR\|(0) yading@10: instead. yading@10: .IP "\fB\s-1RTCSTART\s0\fR" 4 yading@10: .IX Item "RTCSTART" yading@10: wallclock (\s-1RTC\s0) time at the start of the movie in microseconds yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Start counting \s-1PTS\s0 from zero yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=PTS\-STARTPTS yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply fast motion effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=0.5*PTS yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply slow motion effect: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=2.0*PTS yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set fixed rate of 25 frames per second: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=N/(25*TB) yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set fixed rate 25 fps with some jitter: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=\*(Aq1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))\*(Aq yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Apply an offset of 10 seconds to the input \s-1PTS:\s0 yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=PTS+10/TB yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Generate timestamps from a \*(L"live source\*(R" and rebase onto the current timebase: yading@10: .Sp yading@10: .Vb 1 yading@10: \& setpts=\*(Aq(RTCTIME \- RTCSTART) / (TB * 1000000)\*(Aq yading@10: .Ve yading@10: .SS "ebur128" yading@10: .IX Subsection "ebur128" yading@10: \&\s-1EBU\s0 R128 scanner filter. This filter takes an audio stream as input and outputs yading@10: it unchanged. By default, it logs a message at a frequency of 10Hz with the yading@10: Momentary loudness (identified by \f(CW\*(C`M\*(C'\fR), Short-term loudness (\f(CW\*(C`S\*(C'\fR), yading@10: Integrated loudness (\f(CW\*(C`I\*(C'\fR) and Loudness Range (\f(CW\*(C`LRA\*(C'\fR). yading@10: .PP yading@10: The filter also has a video output (see the \fIvideo\fR option) with a real yading@10: time graph to observe the loudness evolution. The graphic contains the logged yading@10: message mentioned above, so it is not printed anymore when this option is set, yading@10: unless the verbose logging is set. The main graphing area contains the yading@10: short-term loudness (3 seconds of analysis), and the gauge on the right is for yading@10: the momentary loudness (400 milliseconds). yading@10: .PP yading@10: More information about the Loudness Recommendation \s-1EBU\s0 R128 on yading@10: <\fBhttp://tech.ebu.ch/loudness\fR>. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBvideo\fR" 4 yading@10: .IX Item "video" yading@10: Activate the video output. The audio stream is passed unchanged whether this yading@10: option is set or no. The video stream will be the first output stream if yading@10: activated. Default is \f(CW0\fR. yading@10: .IP "\fBsize\fR" 4 yading@10: .IX Item "size" yading@10: Set the video size. This option is for video only. Default and minimum yading@10: resolution is \f(CW\*(C`640x480\*(C'\fR. yading@10: .IP "\fBmeter\fR" 4 yading@10: .IX Item "meter" yading@10: Set the \s-1EBU\s0 scale meter. Default is \f(CW9\fR. Common values are \f(CW9\fR and yading@10: \&\f(CW18\fR, respectively for \s-1EBU\s0 scale meter +9 and \s-1EBU\s0 scale meter +18. Any yading@10: other integer value between this range is allowed. yading@10: .IP "\fBmetadata\fR" 4 yading@10: .IX Item "metadata" yading@10: Set metadata injection. If set to \f(CW1\fR, the audio input will be segmented yading@10: into 100ms output frames, each of them containing various loudness information yading@10: in metadata. All the metadata keys are prefixed with \f(CW\*(C`lavfi.r128.\*(C'\fR. yading@10: .Sp yading@10: Default is \f(CW0\fR. yading@10: .IP "\fBframelog\fR" 4 yading@10: .IX Item "framelog" yading@10: Force the frame logging level. yading@10: .Sp yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBinfo\fR" 4 yading@10: .IX Item "info" yading@10: information logging level yading@10: .IP "\fBverbose\fR" 4 yading@10: .IX Item "verbose" yading@10: verbose logging level yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: By default, the logging level is set to \fIinfo\fR. If the \fBvideo\fR or yading@10: the \fBmetadata\fR options are set, it switches to \fIverbose\fR. yading@10: .RE yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Real-time graph using \fBffplay\fR, with a \s-1EBU\s0 scale meter +18: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffplay \-f lavfi \-i "amovie=input.mp3,ebur128=video=1:meter=18 [out0][out1]" yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Run an analysis with \fBffmpeg\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-nostats \-i input.mp3 \-filter_complex ebur128 \-f null \- yading@10: .Ve yading@10: .SS "settb, asettb" yading@10: .IX Subsection "settb, asettb" yading@10: Set the timebase to use for the output frames timestamps. yading@10: It is mainly useful for testing timebase configuration. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBexpr, tb\fR" 4 yading@10: .IX Item "expr, tb" yading@10: The expression which is evaluated into the output timebase. yading@10: .PP yading@10: The value for \fBtb\fR is an arithmetic expression representing a yading@10: rational. The expression can contain the constants \*(L"\s-1AVTB\s0\*(R" (the default yading@10: timebase), \*(L"intb\*(R" (the input timebase) and \*(L"sr\*(R" (the sample rate, yading@10: audio only). Default value is \*(L"intb\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Set the timebase to 1/25: yading@10: .Sp yading@10: .Vb 1 yading@10: \& settb=expr=1/25 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set the timebase to 1/10: yading@10: .Sp yading@10: .Vb 1 yading@10: \& settb=expr=0.1 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set the timebase to 1001/1000: yading@10: .Sp yading@10: .Vb 1 yading@10: \& settb=1+0.001 yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set the timebase to 2*intb: yading@10: .Sp yading@10: .Vb 1 yading@10: \& settb=2*intb yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Set the default timebase value: yading@10: .Sp yading@10: .Vb 1 yading@10: \& settb=AVTB yading@10: .Ve yading@10: .SS "concat" yading@10: .IX Subsection "concat" yading@10: Concatenate audio and video streams, joining them together one after the yading@10: other. yading@10: .PP yading@10: The filter works on segments of synchronized video and audio streams. All yading@10: segments must have the same number of streams of each type, and that will yading@10: also be the number of streams at output. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: Set the number of segments. Default is 2. yading@10: .IP "\fBv\fR" 4 yading@10: .IX Item "v" yading@10: Set the number of output video streams, that is also the number of video yading@10: streams in each segment. Default is 1. yading@10: .IP "\fBa\fR" 4 yading@10: .IX Item "a" yading@10: Set the number of output audio streams, that is also the number of video yading@10: streams in each segment. Default is 0. yading@10: .IP "\fBunsafe\fR" 4 yading@10: .IX Item "unsafe" yading@10: Activate unsafe mode: do not fail if segments have a different format. yading@10: .PP yading@10: The filter has \fIv\fR+\fIa\fR outputs: first \fIv\fR video outputs, then yading@10: \&\fIa\fR audio outputs. yading@10: .PP yading@10: There are \fIn\fRx(\fIv\fR+\fIa\fR) inputs: first the inputs for the first yading@10: segment, in the same order as the outputs, then the inputs for the second yading@10: segment, etc. yading@10: .PP yading@10: Related streams do not always have exactly the same duration, for various yading@10: reasons including codec frame size or sloppy authoring. For that reason, yading@10: related synchronized streams (e.g. a video and its audio track) should be yading@10: concatenated at once. The concat filter will use the duration of the longest yading@10: stream in each segment (except the last one), and if necessary pad shorter yading@10: audio streams with silence. yading@10: .PP yading@10: For this filter to work correctly, all segments must start at timestamp 0. yading@10: .PP yading@10: All corresponding streams must have the same parameters in all segments; the yading@10: filtering system will automatically select a common pixel format for video yading@10: streams, and a common sample format, sample rate and channel layout for yading@10: audio streams, but other settings, such as resolution, must be converted yading@10: explicitly by the user. yading@10: .PP yading@10: Different frame rates are acceptable but will result in variable frame rate yading@10: at output; be sure to configure the output file to handle it. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Concatenate an opening, an episode and an ending, all in bilingual version yading@10: (video in stream 0, audio in streams 1 and 2): yading@10: .Sp yading@10: .Vb 4 yading@10: \& ffmpeg \-i opening.mkv \-i episode.mkv \-i ending.mkv \-filter_complex \e yading@10: \& \*(Aq[0:0] [0:1] [0:2] [1:0] [1:1] [1:2] [2:0] [2:1] [2:2] yading@10: \& concat=n=3:v=1:a=2 [v] [a1] [a2]\*(Aq \e yading@10: \& \-map \*(Aq[v]\*(Aq \-map \*(Aq[a1]\*(Aq \-map \*(Aq[a2]\*(Aq output.mkv yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Concatenate two parts, handling audio and video separately, using the yading@10: (a)movie sources, and adjusting the resolution: yading@10: .Sp yading@10: .Vb 3 yading@10: \& movie=part1.mp4, scale=512:288 [v1] ; amovie=part1.mp4 [a1] ; yading@10: \& movie=part2.mp4, scale=512:288 [v2] ; amovie=part2.mp4 [a2] ; yading@10: \& [v1] [v2] concat [outv] ; [a1] [a2] concat=v=0:a=1 [outa] yading@10: .Ve yading@10: .Sp yading@10: Note that a desync will happen at the stitch if the audio and video streams yading@10: do not have exactly the same duration in the first file. yading@10: .SS "showspectrum" yading@10: .IX Subsection "showspectrum" yading@10: Convert input audio to a video output, representing the audio frequency yading@10: spectrum. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Specify the video size for the output. Default value is \f(CW\*(C`640x512\*(C'\fR. yading@10: .IP "\fBslide\fR" 4 yading@10: .IX Item "slide" yading@10: Specify if the spectrum should slide along the window. Default value is yading@10: \&\f(CW0\fR. yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Specify display mode. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBcombined\fR" 4 yading@10: .IX Item "combined" yading@10: all channels are displayed in the same row yading@10: .IP "\fBseparate\fR" 4 yading@10: .IX Item "separate" yading@10: all channels are displayed in separate rows yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBcombined\fR. yading@10: .RE yading@10: .IP "\fBcolor\fR" 4 yading@10: .IX Item "color" yading@10: Specify display color mode. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBchannel\fR" 4 yading@10: .IX Item "channel" yading@10: each channel is displayed in a separate color yading@10: .IP "\fBintensity\fR" 4 yading@10: .IX Item "intensity" yading@10: each channel is is displayed using the same color scheme yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBchannel\fR. yading@10: .RE yading@10: .IP "\fBscale\fR" 4 yading@10: .IX Item "scale" yading@10: Specify scale used for calculating intensity color values. yading@10: .Sp yading@10: It accepts the following values: yading@10: .RS 4 yading@10: .IP "\fBlin\fR" 4 yading@10: .IX Item "lin" yading@10: linear yading@10: .IP "\fBsqrt\fR" 4 yading@10: .IX Item "sqrt" yading@10: square root, default yading@10: .IP "\fBcbrt\fR" 4 yading@10: .IX Item "cbrt" yading@10: cubic root yading@10: .IP "\fBlog\fR" 4 yading@10: .IX Item "log" yading@10: logarithmic yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \fBsqrt\fR. yading@10: .RE yading@10: .IP "\fBsaturation\fR" 4 yading@10: .IX Item "saturation" yading@10: Set saturation modifier for displayed colors. Negative values provide yading@10: alternative color scheme. \f(CW0\fR is no saturation at all. yading@10: Saturation must be in [\-10.0, 10.0] range. yading@10: Default value is \f(CW1\fR. yading@10: .PP yading@10: The usage is very similar to the showwaves filter; see the examples in that yading@10: section. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Large window with logarithmic color scaling: yading@10: .Sp yading@10: .Vb 1 yading@10: \& showspectrum=s=1280x480:scale=log yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Complete example for a colored and sliding spectrum per channel using \fBffplay\fR: yading@10: .Sp yading@10: .Vb 2 yading@10: \& ffplay \-f lavfi \*(Aqamovie=input.mp3, asplit [a][out1]; yading@10: \& [a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]\*(Aq yading@10: .Ve yading@10: .SS "showwaves" yading@10: .IX Subsection "showwaves" yading@10: Convert input audio to a video output, representing the samples waves. yading@10: .PP yading@10: The filter accepts the following options: yading@10: .IP "\fBsize, s\fR" 4 yading@10: .IX Item "size, s" yading@10: Specify the video size for the output. Default value is \*(L"600x240\*(R". yading@10: .IP "\fBmode\fR" 4 yading@10: .IX Item "mode" yading@10: Set display mode. yading@10: .Sp yading@10: Available values are: yading@10: .RS 4 yading@10: .IP "\fBpoint\fR" 4 yading@10: .IX Item "point" yading@10: Draw a point for each sample. yading@10: .IP "\fBline\fR" 4 yading@10: .IX Item "line" yading@10: Draw a vertical line for each sample. yading@10: .RE yading@10: .RS 4 yading@10: .Sp yading@10: Default value is \f(CW\*(C`point\*(C'\fR. yading@10: .RE yading@10: .IP "\fBn\fR" 4 yading@10: .IX Item "n" yading@10: Set the number of samples which are printed on the same column. A yading@10: larger value will decrease the frame rate. Must be a positive yading@10: integer. This option can be set only if the value for \fIrate\fR yading@10: is not explicitly specified. yading@10: .IP "\fBrate, r\fR" 4 yading@10: .IX Item "rate, r" yading@10: Set the (approximate) output frame rate. This is done by setting the yading@10: option \fIn\fR. Default value is \*(L"25\*(R". yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Output the input file audio and the corresponding video representation yading@10: at the same time: yading@10: .Sp yading@10: .Vb 1 yading@10: \& amovie=a.mp3,asplit[out0],showwaves[out1] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Create a synthetic signal and show it with showwaves, forcing a yading@10: frame rate of 30 frames per second: yading@10: .Sp yading@10: .Vb 1 yading@10: \& aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1] yading@10: .Ve yading@10: .SS "split, asplit" yading@10: .IX Subsection "split, asplit" yading@10: Split input into several identical outputs. yading@10: .PP yading@10: \&\f(CW\*(C`asplit\*(C'\fR works with audio input, \f(CW\*(C`split\*(C'\fR with video. yading@10: .PP yading@10: The filter accepts a single parameter which specifies the number of outputs. If yading@10: unspecified, it defaults to 2. yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Create two separate outputs from the same input: yading@10: .Sp yading@10: .Vb 1 yading@10: \& [in] split [out0][out1] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: To create 3 or more outputs, you need to specify the number of yading@10: outputs, like in: yading@10: .Sp yading@10: .Vb 1 yading@10: \& [in] asplit=3 [out0][out1][out2] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Create two separate outputs from the same input, one cropped and yading@10: one padded: yading@10: .Sp yading@10: .Vb 3 yading@10: \& [in] split [splitout1][splitout2]; yading@10: \& [splitout1] crop=100:100:0:0 [cropout]; yading@10: \& [splitout2] pad=200:200:100:100 [padout]; yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Create 5 copies of the input audio with \fBffmpeg\fR: yading@10: .Sp yading@10: .Vb 1 yading@10: \& ffmpeg \-i INPUT \-filter_complex asplit=5 OUTPUT yading@10: .Ve yading@10: .SH "MULTIMEDIA SOURCES" yading@10: .IX Header "MULTIMEDIA SOURCES" yading@10: Below is a description of the currently available multimedia sources. yading@10: .SS "amovie" yading@10: .IX Subsection "amovie" yading@10: This is the same as movie source, except it selects an audio yading@10: stream by default. yading@10: .SS "movie" yading@10: .IX Subsection "movie" yading@10: Read audio and/or video stream(s) from a movie container. yading@10: .PP yading@10: This filter accepts the following options: yading@10: .IP "\fBfilename\fR" 4 yading@10: .IX Item "filename" yading@10: The name of the resource to read (not necessarily a file but also a device or a yading@10: stream accessed through some protocol). yading@10: .IP "\fBformat_name, f\fR" 4 yading@10: .IX Item "format_name, f" yading@10: Specifies the format assumed for the movie to read, and can be either yading@10: the name of a container or an input device. If not specified the yading@10: format is guessed from \fImovie_name\fR or by probing. yading@10: .IP "\fBseek_point, sp\fR" 4 yading@10: .IX Item "seek_point, sp" yading@10: Specifies the seek point in seconds, the frames will be output yading@10: starting from this seek point, the parameter is evaluated with yading@10: \&\f(CW\*(C`av_strtod\*(C'\fR so the numerical value may be suffixed by an \s-1IS\s0 yading@10: postfix. Default value is \*(L"0\*(R". yading@10: .IP "\fBstreams, s\fR" 4 yading@10: .IX Item "streams, s" yading@10: Specifies the streams to read. Several streams can be specified, yading@10: separated by \*(L"+\*(R". The source will then have as many outputs, in the yading@10: same order. The syntax is explained in the ``Stream specifiers'' yading@10: section in the ffmpeg manual. Two special names, \*(L"dv\*(R" and \*(L"da\*(R" specify yading@10: respectively the default (best suited) video and audio stream. Default yading@10: is \*(L"dv\*(R", or \*(L"da\*(R" if the filter is called as \*(L"amovie\*(R". yading@10: .IP "\fBstream_index, si\fR" 4 yading@10: .IX Item "stream_index, si" yading@10: Specifies the index of the video stream to read. If the value is \-1, yading@10: the best suited video stream will be automatically selected. Default yading@10: value is \*(L"\-1\*(R". Deprecated. If the filter is called \*(L"amovie\*(R", it will select yading@10: audio instead of video. yading@10: .IP "\fBloop\fR" 4 yading@10: .IX Item "loop" yading@10: Specifies how many times to read the stream in sequence. yading@10: If the value is less than 1, the stream will be read again and again. yading@10: Default value is \*(L"1\*(R". yading@10: .Sp yading@10: Note that when the movie is looped the source timestamps are not yading@10: changed, so it will generate non monotonically increasing timestamps. yading@10: .PP yading@10: This filter allows to overlay a second video on top of main input of yading@10: a filtergraph as shown in this graph: yading@10: .PP yading@10: .Vb 4 yading@10: \& input \-\-\-\-\-\-\-\-\-\-\-> deltapts0 \-\-> overlay \-\-> output yading@10: \& ^ yading@10: \& | yading@10: \& movie \-\-> scale\-\-> deltapts1 \-\-\-\-\-\-\-+ yading@10: .Ve yading@10: .PP yading@10: \fIExamples\fR yading@10: .IX Subsection "Examples" yading@10: .IP "\(bu" 4 yading@10: Skip 3.2 seconds from the start of the avi file in.avi, and overlay it yading@10: on top of the input labelled as \*(L"in\*(R": yading@10: .Sp yading@10: .Vb 3 yading@10: \& movie=in.avi:seek_point=3.2, scale=180:\-1, setpts=PTS\-STARTPTS [over]; yading@10: \& [in] setpts=PTS\-STARTPTS [main]; yading@10: \& [main][over] overlay=16:16 [out] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Read from a video4linux2 device, and overlay it on top of the input yading@10: labelled as \*(L"in\*(R": yading@10: .Sp yading@10: .Vb 3 yading@10: \& movie=/dev/video0:f=video4linux2, scale=180:\-1, setpts=PTS\-STARTPTS [over]; yading@10: \& [in] setpts=PTS\-STARTPTS [main]; yading@10: \& [main][over] overlay=16:16 [out] yading@10: .Ve yading@10: .IP "\(bu" 4 yading@10: Read the first video stream and the audio stream with id 0x81 from yading@10: dvd.vob; the video is connected to the pad named \*(L"video\*(R" and the audio is yading@10: connected to the pad named \*(L"audio\*(R": yading@10: .Sp yading@10: .Vb 1 yading@10: \& movie=dvd.vob:s=v:0+#0x81 [video] [audio] yading@10: .Ve yading@10: .SH "SEE ALSO" yading@10: .IX Header "SEE ALSO" yading@10: \&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1), \fIlibavfilter\fR\|(3) yading@10: .SH "AUTHORS" yading@10: .IX Header "AUTHORS" yading@10: The FFmpeg developers. yading@10: .PP yading@10: For details about the authorship, see the Git history of the project yading@10: (git://source.ffmpeg.org/ffmpeg), e.g. by typing the command yading@10: \&\fBgit log\fR in the FFmpeg source directory, or browsing the yading@10: online repository at <\fBhttp://source.ffmpeg.org\fR>. yading@10: .PP yading@10: Maintainers for the specific components are listed in the file yading@10: \&\fI\s-1MAINTAINERS\s0\fR in the source code tree.