yading@10: =head1 NAME
yading@10: 
yading@10: ffmpeg-codecs - FFmpeg codecs
yading@10: 
yading@10: =head1 DESCRIPTION
yading@10: 
yading@10: 
yading@10: This document describes the codecs (decoders and encoders) provided by
yading@10: the libavcodec library.
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 CODEC OPTIONS
yading@10: 
yading@10: 
yading@10: libavcodec provides some generic global options, which can be set on
yading@10: all the encoders and decoders. In addition each codec may support
yading@10: so-called private options, which are specific for a given codec.
yading@10: 
yading@10: Sometimes, a global option may only affect a specific kind of codec,
yading@10: and may be unsensical or ignored by another, so you need to be aware
yading@10: of the meaning of the specified options. Also some options are
yading@10: meant only for decoding or encoding.
yading@10: 
yading@10: Options may be set by specifying -I<option> I<value> in the
yading@10: FFmpeg tools, or by setting the value explicitly in the
yading@10: C<AVCodecContext> options or using the F<libavutil/opt.h> API
yading@10: for programmatic use.
yading@10: 
yading@10: The list of supported options follow:
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<b> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: Set bitrate in bits/s. Default value is 200K.
yading@10: 
yading@10: 
yading@10: =item B<ab> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: Set audio bitrate (in bits/s). Default value is 128K.
yading@10: 
yading@10: 
yading@10: =item B<bt> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
yading@10: tolerance specifies how far ratecontrol is willing to deviate from the
yading@10: target average bitrate value. This is not related to min/max
yading@10: bitrate. Lowering tolerance too much has an adverse effect on quality.
yading@10: 
yading@10: 
yading@10: =item B<flags> I<flags> B<(>I<decoding/encoding,audio,video,subtitles>B<)>
yading@10: 
yading@10: Set generic flags.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<mv4>
yading@10: 
yading@10: Use four motion vector by macroblock (mpeg4).
yading@10: 
yading@10: =item B<qpel>
yading@10: 
yading@10: Use 1/4 pel motion compensation.
yading@10: 
yading@10: =item B<loop>
yading@10: 
yading@10: Use loop filter.
yading@10: 
yading@10: =item B<qscale>
yading@10: 
yading@10: Use fixed qscale.
yading@10: 
yading@10: =item B<gmc>
yading@10: 
yading@10: Use gmc.
yading@10: 
yading@10: =item B<mv0>
yading@10: 
yading@10: Always try a mb with mv=E<lt>0,0E<gt>.
yading@10: 
yading@10: =item B<input_preserved>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<pass1>
yading@10: 
yading@10: Use internal 2pass ratecontrol in first pass mode.
yading@10: 
yading@10: =item B<pass2>
yading@10: 
yading@10: Use internal 2pass ratecontrol in second pass mode.
yading@10: 
yading@10: =item B<gray>
yading@10: 
yading@10: Only decode/encode grayscale.
yading@10: 
yading@10: =item B<emu_edge>
yading@10: 
yading@10: Do not draw edges.
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: Set error[?] variables during encoding.
yading@10: 
yading@10: =item B<truncated>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<naq>
yading@10: 
yading@10: Normalize adaptive quantization.
yading@10: 
yading@10: =item B<ildct>
yading@10: 
yading@10: Use interlaced DCT.
yading@10: 
yading@10: =item B<low_delay>
yading@10: 
yading@10: Force low delay.
yading@10: 
yading@10: =item B<global_header>
yading@10: 
yading@10: Place global headers in extradata instead of every keyframe.
yading@10: 
yading@10: =item B<bitexact>
yading@10: 
yading@10: Use only bitexact stuff (except (I)DCT).
yading@10: 
yading@10: =item B<aic>
yading@10: 
yading@10: Apply H263 advanced intra coding / mpeg4 ac prediction.
yading@10: 
yading@10: =item B<cbp>
yading@10: 
yading@10: Deprecated, use mpegvideo private options instead.
yading@10: 
yading@10: =item B<qprd>
yading@10: 
yading@10: Deprecated, use mpegvideo private options instead.
yading@10: 
yading@10: =item B<ilme>
yading@10: 
yading@10: Apply interlaced motion estimation.
yading@10: 
yading@10: =item B<cgop>
yading@10: 
yading@10: Use closed gop.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<sub_id> I<integer>
yading@10: 
yading@10: Deprecated, currently unused.
yading@10: 
yading@10: 
yading@10: =item B<me_method> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set motion estimation method.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: zero motion estimation (fastest)
yading@10: 
yading@10: =item B<full>
yading@10: 
yading@10: full motion estimation (slowest)
yading@10: 
yading@10: =item B<epzs>
yading@10: 
yading@10: EPZS motion estimation (default)
yading@10: 
yading@10: =item B<esa>
yading@10: 
yading@10: esa motion estimation (alias for full)
yading@10: 
yading@10: =item B<tesa>
yading@10: 
yading@10: tesa motion estimation
yading@10: 
yading@10: =item B<dia>
yading@10: 
yading@10: dia motion estimation (alias for epzs)
yading@10: 
yading@10: =item B<log>
yading@10: 
yading@10: log motion estimation
yading@10: 
yading@10: =item B<phods>
yading@10: 
yading@10: phods motion estimation
yading@10: 
yading@10: =item B<x1>
yading@10: 
yading@10: X1 motion estimation
yading@10: 
yading@10: =item B<hex>
yading@10: 
yading@10: hex motion estimation
yading@10: 
yading@10: =item B<umh>
yading@10: 
yading@10: umh motion estimation
yading@10: 
yading@10: =item B<iter>
yading@10: 
yading@10: iter motion estimation
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<extradata_size> I<integer>
yading@10: 
yading@10: Set extradata size.
yading@10: 
yading@10: 
yading@10: =item B<time_base> I<rational number>
yading@10: 
yading@10: Set codec time base.
yading@10: 
yading@10: It is the fundamental unit of time (in seconds) in terms of which
yading@10: frame timestamps are represented. For fixed-fps content, timebase
yading@10: should be C<1 / frame_rate> and timestamp increments should be
yading@10: identically 1.
yading@10: 
yading@10: 
yading@10: =item B<g> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set the group of picture size. Default value is 12.
yading@10: 
yading@10: 
yading@10: =item B<ar> I<integer> B<(>I<decoding/encoding,audio>B<)>
yading@10: 
yading@10: Set audio sampling rate (in Hz).
yading@10: 
yading@10: 
yading@10: =item B<ac> I<integer> B<(>I<decoding/encoding,audio>B<)>
yading@10: 
yading@10: Set number of audio channels.
yading@10: 
yading@10: 
yading@10: =item B<cutoff> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: Set cutoff bandwidth.
yading@10: 
yading@10: 
yading@10: =item B<frame_size> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: Set audio frame size.
yading@10: 
yading@10: Each submitted frame except the last must contain exactly frame_size
yading@10: samples per channel. May be 0 when the codec has
yading@10: CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is not
yading@10: restricted. It is set by some decoders to indicate constant frame
yading@10: size.
yading@10: 
yading@10: 
yading@10: =item B<frame_number> I<integer>
yading@10: 
yading@10: Set the frame number.
yading@10: 
yading@10: 
yading@10: =item B<delay> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<qcomp> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set video quantizer scale compression (VBR). It is used as a constant
yading@10: in the ratecontrol equation. Recommended range for default rc_eq:
yading@10: 0.0-1.0.
yading@10: 
yading@10: 
yading@10: =item B<qblur> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set video quantizer scale blur (VBR).
yading@10: 
yading@10: 
yading@10: =item B<qmin> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set min video quantizer scale (VBR). Must be included between -1 and
yading@10: 69, default value is 2.
yading@10: 
yading@10: 
yading@10: =item B<qmax> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set max video quantizer scale (VBR). Must be included between -1 and
yading@10: 1024, default value is 31.
yading@10: 
yading@10: 
yading@10: =item B<qdiff> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set max difference between the quantizer scale (VBR).
yading@10: 
yading@10: 
yading@10: =item B<bf> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set max number of B frames.
yading@10: 
yading@10: 
yading@10: =item B<b_qfactor> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set qp factor between P and B frames.
yading@10: 
yading@10: 
yading@10: =item B<rc_strategy> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set ratecontrol method.
yading@10: 
yading@10: 
yading@10: =item B<b_strategy> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set strategy to choose between I/P/B-frames.
yading@10: 
yading@10: 
yading@10: =item B<ps> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set RTP payload size in bytes.
yading@10: 
yading@10: 
yading@10: =item B<mv_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<header_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<i_tex_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<p_tex_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<i_count> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<p_count> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<skip_count> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<misc_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<frame_bits> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<codec_tag> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<bug> I<flags> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: Workaround not auto detected encoder bugs.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<autodetect>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<old_msmpeg4>
yading@10: 
yading@10: some old lavc generated msmpeg4v3 files (no autodetection)
yading@10: 
yading@10: =item B<xvid_ilace>
yading@10: 
yading@10: Xvid interlacing bug (autodetected if fourcc==XVIX)
yading@10: 
yading@10: =item B<ump4>
yading@10: 
yading@10: (autodetected if fourcc==UMP4)
yading@10: 
yading@10: =item B<no_padding>
yading@10: 
yading@10: padding bug (autodetected)
yading@10: 
yading@10: =item B<amv>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<ac_vlc>
yading@10: 
yading@10: illegal vlc bug (autodetected per fourcc)
yading@10: 
yading@10: =item B<qpel_chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<std_qpel>
yading@10: 
yading@10: old standard qpel (autodetected per fourcc/version)
yading@10: 
yading@10: =item B<qpel_chroma2>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<direct_blocksize>
yading@10: 
yading@10: direct-qpel-blocksize bug (autodetected per fourcc/version)
yading@10: 
yading@10: =item B<edge>
yading@10: 
yading@10: edge padding bug (autodetected per fourcc/version)
yading@10: 
yading@10: =item B<hpel_chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dc_clip>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<ms>
yading@10: 
yading@10: Workaround various bugs in microsoft broken decoders.
yading@10: 
yading@10: =item B<trunc>
yading@10: 
yading@10: trancated frames
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<lelim> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set single coefficient elimination threshold for luminance (negative
yading@10: values also consider DC coefficient).
yading@10: 
yading@10: 
yading@10: =item B<celim> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set single coefficient elimination threshold for chrominance (negative
yading@10: values also consider dc coefficient)
yading@10: 
yading@10: 
yading@10: =item B<strict> I<integer> B<(>I<decoding/encoding,audio,video>B<)>
yading@10: 
yading@10: Specify how strictly to follow the standards.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<very>
yading@10: 
yading@10: strictly conform to a older more strict version of the spec or reference software
yading@10: 
yading@10: =item B<strict>
yading@10: 
yading@10: strictly conform to all the things in the spec no matter what consequences
yading@10: 
yading@10: =item B<normal>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<unofficial>
yading@10: 
yading@10: allow unofficial extensions
yading@10: 
yading@10: =item B<experimental>
yading@10: 
yading@10: allow non standardized experimental things
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<b_qoffset> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set QP offset between P and B frames.
yading@10: 
yading@10: 
yading@10: =item B<err_detect> I<flags> B<(>I<decoding,audio,video>B<)>
yading@10: 
yading@10: Set error detection flags.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<crccheck>
yading@10: 
yading@10: verify embedded CRCs
yading@10: 
yading@10: =item B<bitstream>
yading@10: 
yading@10: detect bitstream specification deviations
yading@10: 
yading@10: =item B<buffer>
yading@10: 
yading@10: detect improper bitstream length
yading@10: 
yading@10: =item B<explode>
yading@10: 
yading@10: abort decoding on minor error detection
yading@10: 
yading@10: =item B<careful>
yading@10: 
yading@10: consider things that violate the spec and have not been seen in the wild as errors
yading@10: 
yading@10: =item B<compliant>
yading@10: 
yading@10: consider all spec non compliancies as errors
yading@10: 
yading@10: =item B<aggressive>
yading@10: 
yading@10: consider things that a sane encoder should not do as an error
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<has_b_frames> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<block_align> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<mpeg_quant> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Use MPEG quantizers instead of H.263.
yading@10: 
yading@10: 
yading@10: =item B<qsquish> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: How to keep quantizer between qmin and qmax (0 = clip, 1 = use
yading@10: differentiable function).
yading@10: 
yading@10: 
yading@10: =item B<rc_qmod_amp> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set experimental quantizer modulation.
yading@10: 
yading@10: 
yading@10: =item B<rc_qmod_freq> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set experimental quantizer modulation.
yading@10: 
yading@10: 
yading@10: =item B<rc_override_count> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<rc_eq> I<string> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set rate control equation. When computing the expression, besides the
yading@10: standard functions defined in the section 'Expression Evaluation', the
yading@10: following functions are available: bits2qp(bits), qp2bits(qp). Also
yading@10: the following constants are available: iTex pTex tex mv fCode iCount
yading@10: mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex
yading@10: avgTex.
yading@10: 
yading@10: 
yading@10: =item B<maxrate> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
yading@10: 
yading@10: 
yading@10: =item B<minrate> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR
yading@10: encode. It is of little use elsewise.
yading@10: 
yading@10: 
yading@10: =item B<bufsize> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: Set ratecontrol buffer size (in bits).
yading@10: 
yading@10: 
yading@10: =item B<rc_buf_aggressivity> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Currently useless.
yading@10: 
yading@10: 
yading@10: =item B<i_qfactor> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set QP factor between P and I frames.
yading@10: 
yading@10: 
yading@10: =item B<i_qoffset> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set QP offset between P and I frames.
yading@10: 
yading@10: 
yading@10: =item B<rc_init_cplx> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set initial complexity for 1-pass encoding.
yading@10: 
yading@10: 
yading@10: =item B<dct> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set DCT algorithm.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: autoselect a good one (default)
yading@10: 
yading@10: =item B<fastint>
yading@10: 
yading@10: fast integer
yading@10: 
yading@10: =item B<int>
yading@10: 
yading@10: accurate integer
yading@10: 
yading@10: =item B<mmx>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<altivec>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<faan>
yading@10: 
yading@10: floating point AAN DCT
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<lumi_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Compress bright areas stronger than medium ones.
yading@10: 
yading@10: 
yading@10: =item B<tcplx_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set temporal complexity masking.
yading@10: 
yading@10: 
yading@10: =item B<scplx_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set spatial complexity masking.
yading@10: 
yading@10: 
yading@10: =item B<p_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set inter masking.
yading@10: 
yading@10: 
yading@10: =item B<dark_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Compress dark areas stronger than medium ones.
yading@10: 
yading@10: 
yading@10: =item B<idct> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: Select IDCT implementation.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<int>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simple>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simplemmx>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<libmpeg2mmx>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<mmi>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<arm>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<altivec>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<sh4>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simplearm>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simplearmv5te>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simplearmv6>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simpleneon>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simplealpha>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<h264>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<vp3>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<ipp>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<xvidmmx>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<faani>
yading@10: 
yading@10: floating point AAN IDCT
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<slice_count> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<ec> I<flags> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: Set error concealment strategy.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<guess_mvs>
yading@10: 
yading@10: iterative motion vector (MV) search (slow)
yading@10: 
yading@10: =item B<deblock>
yading@10: 
yading@10: use strong deblock filter for damaged MBs
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<bits_per_coded_sample> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<pred> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set prediction method.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<left>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<plane>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<median>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aspect> I<rational number> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set sample aspect ratio.
yading@10: 
yading@10: 
yading@10: =item B<debug> I<flags> B<(>I<decoding/encoding,audio,video,subtitles>B<)>
yading@10: 
yading@10: Print specific debug info.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<pict>
yading@10: 
yading@10: picture info
yading@10: 
yading@10: =item B<rc>
yading@10: 
yading@10: rate control
yading@10: 
yading@10: =item B<bitstream>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<mb_type>
yading@10: 
yading@10: macroblock (MB) type
yading@10: 
yading@10: =item B<qp>
yading@10: 
yading@10: per-block quantization parameter (QP)
yading@10: 
yading@10: =item B<mv>
yading@10: 
yading@10: motion vector
yading@10: 
yading@10: =item B<dct_coeff>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<skip>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<startcode>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<pts>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<er>
yading@10: 
yading@10: error recognition
yading@10: 
yading@10: =item B<mmco>
yading@10: 
yading@10: memory management control operations (H.264)
yading@10: 
yading@10: =item B<bugs>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<vis_qp>
yading@10: 
yading@10: visualize quantization parameter (QP), lower QP are tinted greener
yading@10: 
yading@10: =item B<vis_mb_type>
yading@10: 
yading@10: visualize block types
yading@10: 
yading@10: =item B<buffers>
yading@10: 
yading@10: picture buffer allocations
yading@10: 
yading@10: =item B<thread_ops>
yading@10: 
yading@10: threading operations
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<vismv> I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: Visualize motion vectors (MVs).
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<pf>
yading@10: 
yading@10: forward predicted MVs of P-frames
yading@10: 
yading@10: =item B<bf>
yading@10: 
yading@10: forward predicted MVs of B-frames
yading@10: 
yading@10: =item B<bb>
yading@10: 
yading@10: backward predicted MVs of B-frames
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<cmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set full pel me compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<subcmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set sub pel me compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<mbcmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set macroblock compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<ildctcmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set interlaced dct compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dia_size> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set diamond type & size for motion estimation.
yading@10: 
yading@10: 
yading@10: =item B<last_pred> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set amount of motion predictors from the previous frame.
yading@10: 
yading@10: 
yading@10: =item B<preme> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set pre motion estimation.
yading@10: 
yading@10: 
yading@10: =item B<precmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set pre motion estimation compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<pre_dia_size> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set diamond type & size for motion estimation pre-pass.
yading@10: 
yading@10: 
yading@10: =item B<subq> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set sub pel motion estimation quality.
yading@10: 
yading@10: 
yading@10: =item B<dtg_active_format> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<me_range> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set limit motion vectors range (1023 for DivX player).
yading@10: 
yading@10: 
yading@10: =item B<ibias> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set intra quant bias.
yading@10: 
yading@10: 
yading@10: =item B<pbias> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set inter quant bias.
yading@10: 
yading@10: 
yading@10: =item B<color_table_id> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<global_quality> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<coder> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<vlc>
yading@10: 
yading@10: variable length coder / huffman coder
yading@10: 
yading@10: =item B<ac>
yading@10: 
yading@10: arithmetic coder
yading@10: 
yading@10: =item B<raw>
yading@10: 
yading@10: raw (no encoding)
yading@10: 
yading@10: =item B<rle>
yading@10: 
yading@10: run-length coder
yading@10: 
yading@10: =item B<deflate>
yading@10: 
yading@10: deflate-based coder
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<context> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set context model.
yading@10: 
yading@10: 
yading@10: =item B<slice_flags> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<xvmc_acceleration> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<mbd> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set macroblock decision algorithm (high quality mode).
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<simple>
yading@10: 
yading@10: use mbcmp (default)
yading@10: 
yading@10: =item B<bits>
yading@10: 
yading@10: use fewest bits
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: use best rate distortion
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<stream_codec_tag> I<integer>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<sc_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set scene change threshold.
yading@10: 
yading@10: 
yading@10: =item B<lmin> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set min lagrange factor (VBR).
yading@10: 
yading@10: 
yading@10: =item B<lmax> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set max lagrange factor (VBR).
yading@10: 
yading@10: 
yading@10: =item B<nr> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set noise reduction.
yading@10: 
yading@10: 
yading@10: =item B<rc_init_occupancy> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set number of bits which should be loaded into the rc buffer before
yading@10: decoding starts.
yading@10: 
yading@10: 
yading@10: =item B<inter_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<flags2> I<flags> B<(>I<decoding/encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<fast>
yading@10: 
yading@10: allow non spec compliant speedup tricks
yading@10: 
yading@10: =item B<sgop>
yading@10: 
yading@10: Deprecated, use mpegvideo private options instead
yading@10: 
yading@10: =item B<noout>
yading@10: 
yading@10: skip bitstream encoding
yading@10: 
yading@10: =item B<local_header>
yading@10: 
yading@10: place global headers at every keyframe instead of in extradata
yading@10: 
yading@10: =item B<chunks>
yading@10: 
yading@10: Frame data might be split into multiple chunks
yading@10: 
yading@10: =item B<showall>
yading@10: 
yading@10: Show all frames before the first keyframe
yading@10: 
yading@10: =item B<skiprd>
yading@10: 
yading@10: Deprecated, use mpegvideo private options instead
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<error> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<qns> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Deprecated, use mpegvideo private options instead.
yading@10: 
yading@10: 
yading@10: =item B<threads> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: detect a good number of threads
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<me_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set motion estimation threshold.
yading@10: 
yading@10: 
yading@10: =item B<mb_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set macroblock threshold.
yading@10: 
yading@10: 
yading@10: =item B<dc> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set intra_dc_precision.
yading@10: 
yading@10: 
yading@10: =item B<nssew> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set nsse weight.
yading@10: 
yading@10: 
yading@10: =item B<skip_top> I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: Set number of macroblock rows at the top which are skipped.
yading@10: 
yading@10: 
yading@10: =item B<skip_bottom> I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: Set number of macroblock rows at the bottom which are skipped.
yading@10: 
yading@10: 
yading@10: =item B<profile> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<unknown>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_main>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_low>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_ssr>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_ltp>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_he>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_he_v2>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_ld>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<aac_eld>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dts>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dts_es>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dts_96_24>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dts_hd_hra>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<dts_hd_ma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<level> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<unknown>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<lowres> I<integer> B<(>I<decoding,audio,video>B<)>
yading@10: 
yading@10: Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
yading@10: 
yading@10: 
yading@10: =item B<skip_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set frame skip threshold.
yading@10: 
yading@10: 
yading@10: =item B<skip_factor> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set frame skip factor.
yading@10: 
yading@10: 
yading@10: =item B<skip_exp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set frame skip exponent.
yading@10: 
yading@10: 
yading@10: =item B<skipcmp> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set frame skip compare function.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<sad>
yading@10: 
yading@10: sum of absolute differences, fast (default)
yading@10: 
yading@10: =item B<sse>
yading@10: 
yading@10: sum of squared errors
yading@10: 
yading@10: =item B<satd>
yading@10: 
yading@10: sum of absolute Hadamard transformed differences
yading@10: 
yading@10: =item B<dct>
yading@10: 
yading@10: sum of absolute DCT transformed differences
yading@10: 
yading@10: =item B<psnr>
yading@10: 
yading@10: sum of squared quantization errors (avoid, low quality)
yading@10: 
yading@10: =item B<bit>
yading@10: 
yading@10: number of bits needed for the block
yading@10: 
yading@10: =item B<rd>
yading@10: 
yading@10: rate distortion optimal, slow
yading@10: 
yading@10: =item B<zero>
yading@10: 
yading@10: 0
yading@10: 
yading@10: =item B<vsad>
yading@10: 
yading@10: sum of absolute vertical differences
yading@10: 
yading@10: =item B<vsse>
yading@10: 
yading@10: sum of squared vertical differences
yading@10: 
yading@10: =item B<nsse>
yading@10: 
yading@10: noise preserving sum of squared differences
yading@10: 
yading@10: =item B<w53>
yading@10: 
yading@10: 5/3 wavelet, only used in snow
yading@10: 
yading@10: =item B<w97>
yading@10: 
yading@10: 9/7 wavelet, only used in snow
yading@10: 
yading@10: =item B<dctmax>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<chroma>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<border_mask> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Increase the quantizer for macroblocks close to borders.
yading@10: 
yading@10: 
yading@10: =item B<mblmin> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set min macroblock lagrange factor (VBR).
yading@10: 
yading@10: 
yading@10: =item B<mblmax> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set max macroblock lagrange factor (VBR).
yading@10: 
yading@10: 
yading@10: =item B<mepc> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set motion estimation bitrate penalty compensation (1.0 = 256).
yading@10: 
yading@10: 
yading@10: =item B<skip_loop_filter> I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<skip_idct>        I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<skip_frame>       I<integer> B<(>I<decoding,video>B<)>
yading@10: 
yading@10: 
yading@10: Make decoder discard processing depending on the frame type selected
yading@10: by the option value.
yading@10: 
yading@10: B<skip_loop_filter> skips frame loop filtering, B<skip_idct>
yading@10: skips frame IDCT/dequantization, B<skip_frame> skips decoding.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: Discard no frame.
yading@10: 
yading@10: 
yading@10: =item B<default>
yading@10: 
yading@10: Discard useless frames like 0-sized frames.
yading@10: 
yading@10: 
yading@10: =item B<noref>
yading@10: 
yading@10: Discard all non-reference frames.
yading@10: 
yading@10: 
yading@10: =item B<bidir>
yading@10: 
yading@10: Discard all bidirectional frames.
yading@10: 
yading@10: 
yading@10: =item B<nokey>
yading@10: 
yading@10: Discard all frames excepts keyframes.
yading@10: 
yading@10: 
yading@10: =item B<all>
yading@10: 
yading@10: Discard all frames.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: Default value is B<default>.
yading@10: 
yading@10: 
yading@10: =item B<bidir_refine> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Refine the two motion vectors used in bidirectional macroblocks.
yading@10: 
yading@10: 
yading@10: =item B<brd_scale> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Downscale frames for dynamic B-frame decision.
yading@10: 
yading@10: 
yading@10: =item B<keyint_min> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set minimum interval between IDR-frames.
yading@10: 
yading@10: 
yading@10: =item B<refs> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set reference frames to consider for motion compensation.
yading@10: 
yading@10: 
yading@10: =item B<chromaoffset> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set chroma qp offset from luma.
yading@10: 
yading@10: 
yading@10: =item B<trellis> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: Set rate-distortion optimal quantization.
yading@10: 
yading@10: 
yading@10: =item B<sc_factor> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set value multiplied by qscale for each frame and added to
yading@10: scene_change_score.
yading@10: 
yading@10: 
yading@10: =item B<mv0_threshold> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<b_sensitivity> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Adjust sensitivity of b_frame_strategy 1.
yading@10: 
yading@10: 
yading@10: =item B<compression_level> I<integer> B<(>I<encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<min_prediction_order> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: 
yading@10: =item B<max_prediction_order> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: 
yading@10: =item B<timecode_frame_start> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Set GOP timecode frame start number, in non drop frame format.
yading@10: 
yading@10: 
yading@10: =item B<request_channels> I<integer> B<(>I<decoding,audio>B<)>
yading@10: 
yading@10: Set desired number of audio channels.
yading@10: 
yading@10: 
yading@10: =item B<bits_per_raw_sample> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<channel_layout> I<integer> B<(>I<decoding/encoding,audio>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<request_channel_layout> I<integer> B<(>I<decoding,audio>B<)>
yading@10: 
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<rc_max_vbv_use> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<rc_min_vbv_use> I<float> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<ticks_per_frame> I<integer> B<(>I<decoding/encoding,audio,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<color_primaries> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<color_trc> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<colorspace> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<color_range> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: =item B<chroma_sample_location> I<integer> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<log_level_offset> I<integer>
yading@10: 
yading@10: Set the log level offset.
yading@10: 
yading@10: 
yading@10: =item B<slices> I<integer> B<(>I<encoding,video>B<)>
yading@10: 
yading@10: Number of slices, used in parallelized encoding.
yading@10: 
yading@10: 
yading@10: =item B<thread_type> I<flags> B<(>I<decoding/encoding,video>B<)>
yading@10: 
yading@10: Select multithreading type.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<slice>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<frame>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<audio_service_type> I<integer> B<(>I<encoding,audio>B<)>
yading@10: 
yading@10: Set audio service type.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<ma>
yading@10: 
yading@10: Main Audio Service
yading@10: 
yading@10: =item B<ef>
yading@10: 
yading@10: Effects
yading@10: 
yading@10: =item B<vi>
yading@10: 
yading@10: Visually Impaired
yading@10: 
yading@10: =item B<hi>
yading@10: 
yading@10: Hearing Impaired
yading@10: 
yading@10: =item B<di>
yading@10: 
yading@10: Dialogue
yading@10: 
yading@10: =item B<co>
yading@10: 
yading@10: Commentary
yading@10: 
yading@10: =item B<em>
yading@10: 
yading@10: Emergency
yading@10: 
yading@10: =item B<vo>
yading@10: 
yading@10: Voice Over
yading@10: 
yading@10: =item B<ka>
yading@10: 
yading@10: Karaoke
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<request_sample_fmt> I<sample_fmt> B<(>I<decoding,audio>B<)>
yading@10: 
yading@10: Set sample format audio decoders should prefer. Default value is
yading@10: C<none>.
yading@10: 
yading@10: 
yading@10: =item B<pkt_timebase> I<rational number>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<sub_charenc> I<encoding> B<(>I<decoding,subtitles>B<)>
yading@10: 
yading@10: Set the input subtitles character encoding.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 DECODERS
yading@10: 
yading@10: 
yading@10: Decoders are configured elements in FFmpeg which allow the decoding of
yading@10: multimedia streams.
yading@10: 
yading@10: When you configure your FFmpeg build, all the supported native decoders
yading@10: are enabled by default. Decoders requiring an external library must be enabled
yading@10: manually via the corresponding C<--enable-lib> option. You can list all
yading@10: available decoders using the configure option C<--list-decoders>.
yading@10: 
yading@10: You can disable all the decoders with the configure option
yading@10: C<--disable-decoders> and selectively enable / disable single decoders
yading@10: with the options C<--enable-decoder=I<DECODER>> /
yading@10: C<--disable-decoder=I<DECODER>>.
yading@10: 
yading@10: The option C<-codecs> of the ff* tools will display the list of
yading@10: enabled decoders.
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 VIDEO DECODERS
yading@10: 
yading@10: 
yading@10: A description of some of the currently available video decoders
yading@10: follows.
yading@10: 
yading@10: 
yading@10: =head2 rawvideo
yading@10: 
yading@10: 
yading@10: Raw video decoder.
yading@10: 
yading@10: This decoder decodes rawvideo streams.
yading@10: 
yading@10: 
yading@10: =head3 Options
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<top> I<top_field_first>
yading@10: 
yading@10: Specify the assumed field type of the input video.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<-1>
yading@10: 
yading@10: the video is assumed to be progressive (default)
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: bottom-field-first is assumed
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: top-field-first is assumed
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 AUDIO DECODERS
yading@10: 
yading@10: 
yading@10: 
yading@10: =head2 ffwavesynth
yading@10: 
yading@10: 
yading@10: Internal wave synthetizer.
yading@10: 
yading@10: This decoder generates wave patterns according to predefined sequences. Its
yading@10: use is purely internal and the format of the data it accepts is not publicly
yading@10: documented.
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 SUBTITLES DECODERS
yading@10: 
yading@10: 
yading@10: 
yading@10: =head2 dvdsub
yading@10: 
yading@10: 
yading@10: This codec decodes the bitmap subtitles used in DVDs; the same subtitles can
yading@10: also be found in VobSub file pairs and in some Matroska files.
yading@10: 
yading@10: 
yading@10: =head3 Options
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<palette>
yading@10: 
yading@10: Specify the global palette used by the bitmaps. When stored in VobSub, the
yading@10: palette is normally specified in the index file; in Matroska, the palette is
yading@10: stored in the codec extra-data in the same format as in VobSub. In DVDs, the
yading@10: palette is stored in the IFO file, and therefore not available when reading
yading@10: from dumped VOB files.
yading@10: 
yading@10: The format for this option is a string containing 16 24-bits hexadecimal
yading@10: numbers (without 0x prefix) separated by comas, for example C<0d00ee,
yading@10: ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
yading@10: 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b>.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 ENCODERS
yading@10: 
yading@10: 
yading@10: Encoders are configured elements in FFmpeg which allow the encoding of
yading@10: multimedia streams.
yading@10: 
yading@10: When you configure your FFmpeg build, all the supported native encoders
yading@10: are enabled by default. Encoders requiring an external library must be enabled
yading@10: manually via the corresponding C<--enable-lib> option. You can list all
yading@10: available encoders using the configure option C<--list-encoders>.
yading@10: 
yading@10: You can disable all the encoders with the configure option
yading@10: C<--disable-encoders> and selectively enable / disable single encoders
yading@10: with the options C<--enable-encoder=I<ENCODER>> /
yading@10: C<--disable-encoder=I<ENCODER>>.
yading@10: 
yading@10: The option C<-codecs> of the ff* tools will display the list of
yading@10: enabled encoders.
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 AUDIO ENCODERS
yading@10: 
yading@10: 
yading@10: A description of some of the currently available audio encoders
yading@10: follows.
yading@10: 
yading@10: 
yading@10: =head2 ac3 and ac3_fixed
yading@10: 
yading@10: 
yading@10: AC-3 audio encoders.
yading@10: 
yading@10: These encoders implement part of ATSC A/52:2010 and ETSI TS 102 366, as well as
yading@10: the undocumented RealAudio 3 (a.k.a. dnet).
yading@10: 
yading@10: The I<ac3> encoder uses floating-point math, while the I<ac3_fixed>
yading@10: encoder only uses fixed-point integer math. This does not mean that one is
yading@10: always faster, just that one or the other may be better suited to a
yading@10: particular system. The floating-point encoder will generally produce better
yading@10: quality audio for a given bitrate. The I<ac3_fixed> encoder is not the
yading@10: default codec for any of the output formats, so it must be specified explicitly
yading@10: using the option C<-acodec ac3_fixed> in order to use it.
yading@10: 
yading@10: 
yading@10: =head3 AC-3 Metadata
yading@10: 
yading@10: 
yading@10: The AC-3 metadata options are used to set parameters that describe the audio,
yading@10: but in most cases do not affect the audio encoding itself. Some of the options
yading@10: do directly affect or influence the decoding and playback of the resulting
yading@10: bitstream, while others are just for informational purposes. A few of the
yading@10: options will add bits to the output stream that could otherwise be used for
yading@10: audio data, and will thus affect the quality of the output. Those will be
yading@10: indicated accordingly with a note in the option list below.
yading@10: 
yading@10: These parameters are described in detail in several publicly-available
yading@10: documents.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item *<E<lt>B<http://www.atsc.org/cms/standards/a_52-2010.pdf>E<gt>>
yading@10: 
yading@10: 
yading@10: =item *<E<lt>B<http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf>E<gt>>
yading@10: 
yading@10: 
yading@10: =item *<E<lt>B<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf>E<gt>>
yading@10: 
yading@10: 
yading@10: =item *<E<lt>B<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf>E<gt>>
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head4 Metadata Control Options
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-per_frame_metadata> I<boolean>
yading@10: 
yading@10: Allow Per-Frame Metadata. Specifies if the encoder should check for changing
yading@10: metadata for each frame.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: The metadata values set at initialization will be used for every frame in the
yading@10: stream. (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: Metadata values can be changed before encoding each frame.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head4 Downmix Levels
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-center_mixlev> I<level>
yading@10: 
yading@10: Center Mix Level. The amount of gain the decoder should apply to the center
yading@10: channel when downmixing to stereo. This field will only be written to the
yading@10: bitstream if a center channel is present. The value is specified as a scale
yading@10: factor. There are 3 valid values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3dB gain
yading@10: 
yading@10: =item B<0.595>
yading@10: 
yading@10: Apply -4.5dB gain (default)
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6dB gain
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-surround_mixlev> I<level>
yading@10: 
yading@10: Surround Mix Level. The amount of gain the decoder should apply to the surround
yading@10: channel(s) when downmixing to stereo. This field will only be written to the
yading@10: bitstream if one or more surround channels are present. The value is specified
yading@10: as a scale factor.  There are 3 valid values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3dB gain
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6dB gain (default)
yading@10: 
yading@10: =item B<0.000>
yading@10: 
yading@10: Silence Surround Channel(s)
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head4 Audio Production Information
yading@10: 
yading@10: Audio Production Information is optional information describing the mixing
yading@10: environment.  Either none or both of the fields are written to the bitstream.
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-mixing_level> I<number>
yading@10: 
yading@10: Mixing Level. Specifies peak sound pressure level (SPL) in the production
yading@10: environment when the mix was mastered. Valid values are 80 to 111, or -1 for
yading@10: unknown or not indicated. The default value is -1, but that value cannot be
yading@10: used if the Audio Production Information is written to the bitstream. Therefore,
yading@10: if the C<room_type> option is not the default value, the C<mixing_level>
yading@10: option must not be -1.
yading@10: 
yading@10: 
yading@10: =item B<-room_type> I<type>
yading@10: 
yading@10: Room Type. Describes the equalization used during the final mixing session at
yading@10: the studio or on the dubbing stage. A large room is a dubbing stage with the
yading@10: industry standard X-curve equalization; a small room has flat equalization.
yading@10: This field will not be written to the bitstream if both the C<mixing_level>
yading@10: option and the C<room_type> option have the default values.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<notindicated>
yading@10: 
yading@10: Not Indicated (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<large>
yading@10: 
yading@10: Large Room
yading@10: 
yading@10: =item B<2>
yading@10: 
yading@10: 
yading@10: =item B<small>
yading@10: 
yading@10: Small Room
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head4 Other Metadata Options
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-copyright> I<boolean>
yading@10: 
yading@10: Copyright Indicator. Specifies whether a copyright exists for this audio.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: No Copyright Exists (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Copyright Exists
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-dialnorm> I<value>
yading@10: 
yading@10: Dialogue Normalization. Indicates how far the average dialogue level of the
yading@10: program is below digital 100% full scale (0 dBFS). This parameter determines a
yading@10: level shift during audio reproduction that sets the average volume of the
yading@10: dialogue to a preset level. The goal is to match volume level between program
yading@10: sources. A value of -31dB will result in no volume level change, relative to
yading@10: the source volume, during audio reproduction. Valid values are whole numbers in
yading@10: the range -31 to -1, with -31 being the default.
yading@10: 
yading@10: 
yading@10: =item B<-dsur_mode> I<mode>
yading@10: 
yading@10: Dolby Surround Mode. Specifies whether the stereo signal uses Dolby Surround
yading@10: (Pro Logic). This field will only be written to the bitstream if the audio
yading@10: stream is stereo. Using this option does B<NOT> mean the encoder will actually
yading@10: apply Dolby Surround processing.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<notindicated>
yading@10: 
yading@10: Not Indicated (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: Not Dolby Surround Encoded
yading@10: 
yading@10: =item B<2>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Dolby Surround Encoded
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-original> I<boolean>
yading@10: 
yading@10: Original Bit Stream Indicator. Specifies whether this audio is from the
yading@10: original source and not a copy.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: Not Original Source
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Original Source (default)
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head3 Extended Bitstream Information
yading@10: 
yading@10: The extended bitstream options are part of the Alternate Bit Stream Syntax as
yading@10: specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts.
yading@10: If any one parameter in a group is specified, all values in that group will be
yading@10: written to the bitstream.  Default values are used for those that are written
yading@10: but have not been specified.  If the mixing levels are written, the decoder
yading@10: will use these values instead of the ones specified in the C<center_mixlev>
yading@10: and C<surround_mixlev> options if it supports the Alternate Bit Stream
yading@10: Syntax.
yading@10: 
yading@10: 
yading@10: =head4 Extended Bitstream Information - Part 1
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-dmix_mode> I<mode>
yading@10: 
yading@10: Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt
yading@10: (Dolby Surround) or Lo/Ro (normal stereo) as the preferred stereo downmix mode.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<notindicated>
yading@10: 
yading@10: Not Indicated (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<ltrt>
yading@10: 
yading@10: Lt/Rt Downmix Preferred
yading@10: 
yading@10: =item B<2>
yading@10: 
yading@10: 
yading@10: =item B<loro>
yading@10: 
yading@10: Lo/Ro Downmix Preferred
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-ltrt_cmixlev> I<level>
yading@10: 
yading@10: Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the
yading@10: center channel when downmixing to stereo in Lt/Rt mode.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<1.414>
yading@10: 
yading@10: Apply +3dB gain
yading@10: 
yading@10: =item B<1.189>
yading@10: 
yading@10: Apply +1.5dB gain
yading@10: 
yading@10: =item B<1.000>
yading@10: 
yading@10: Apply 0dB gain
yading@10: 
yading@10: =item B<0.841>
yading@10: 
yading@10: Apply -1.5dB gain
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3.0dB gain
yading@10: 
yading@10: =item B<0.595>
yading@10: 
yading@10: Apply -4.5dB gain (default)
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6.0dB gain
yading@10: 
yading@10: =item B<0.000>
yading@10: 
yading@10: Silence Center Channel
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-ltrt_surmixlev> I<level>
yading@10: 
yading@10: Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the
yading@10: surround channel(s) when downmixing to stereo in Lt/Rt mode.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0.841>
yading@10: 
yading@10: Apply -1.5dB gain
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3.0dB gain
yading@10: 
yading@10: =item B<0.595>
yading@10: 
yading@10: Apply -4.5dB gain
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6.0dB gain (default)
yading@10: 
yading@10: =item B<0.000>
yading@10: 
yading@10: Silence Surround Channel(s)
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-loro_cmixlev> I<level>
yading@10: 
yading@10: Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the
yading@10: center channel when downmixing to stereo in Lo/Ro mode.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<1.414>
yading@10: 
yading@10: Apply +3dB gain
yading@10: 
yading@10: =item B<1.189>
yading@10: 
yading@10: Apply +1.5dB gain
yading@10: 
yading@10: =item B<1.000>
yading@10: 
yading@10: Apply 0dB gain
yading@10: 
yading@10: =item B<0.841>
yading@10: 
yading@10: Apply -1.5dB gain
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3.0dB gain
yading@10: 
yading@10: =item B<0.595>
yading@10: 
yading@10: Apply -4.5dB gain (default)
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6.0dB gain
yading@10: 
yading@10: =item B<0.000>
yading@10: 
yading@10: Silence Center Channel
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-loro_surmixlev> I<level>
yading@10: 
yading@10: Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the
yading@10: surround channel(s) when downmixing to stereo in Lo/Ro mode.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0.841>
yading@10: 
yading@10: Apply -1.5dB gain
yading@10: 
yading@10: =item B<0.707>
yading@10: 
yading@10: Apply -3.0dB gain
yading@10: 
yading@10: =item B<0.595>
yading@10: 
yading@10: Apply -4.5dB gain
yading@10: 
yading@10: =item B<0.500>
yading@10: 
yading@10: Apply -6.0dB gain (default)
yading@10: 
yading@10: =item B<0.000>
yading@10: 
yading@10: Silence Surround Channel(s)
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head4 Extended Bitstream Information - Part 2
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-dsurex_mode> I<mode>
yading@10: 
yading@10: Dolby Surround EX Mode. Indicates whether the stream uses Dolby Surround EX
yading@10: (7.1 matrixed to 5.1). Using this option does B<NOT> mean the encoder will actually
yading@10: apply Dolby Surround EX processing.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<notindicated>
yading@10: 
yading@10: Not Indicated (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Dolby Surround EX Off
yading@10: 
yading@10: =item B<2>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: Dolby Surround EX On
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-dheadphone_mode> I<mode>
yading@10: 
yading@10: Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone
yading@10: encoding (multi-channel matrixed to 2.0 for use with headphones). Using this
yading@10: option does B<NOT> mean the encoder will actually apply Dolby Headphone
yading@10: processing.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<notindicated>
yading@10: 
yading@10: Not Indicated (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Dolby Headphone Off
yading@10: 
yading@10: =item B<2>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: Dolby Headphone On
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-ad_conv_type> I<type>
yading@10: 
yading@10: A/D Converter Type. Indicates whether the audio has passed through HDCD A/D
yading@10: conversion.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<standard>
yading@10: 
yading@10: Standard A/D Converter (default)
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<hdcd>
yading@10: 
yading@10: HDCD A/D Converter
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head3 Other AC-3 Encoding Options
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-stereo_rematrixing> I<boolean>
yading@10: 
yading@10: Stereo Rematrixing. Enables/Disables use of rematrixing for stereo input. This
yading@10: is an optional AC-3 feature that increases quality by selectively encoding
yading@10: the left/right channels as mid/side. This option is enabled by default, and it
yading@10: is highly recommended that it be left as enabled except for testing purposes.
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head3 Floating-Point-Only AC-3 Encoding Options
yading@10: 
yading@10: 
yading@10: These options are only valid for the floating-point encoder and do not exist
yading@10: for the fixed-point encoder due to the corresponding features not being
yading@10: implemented in fixed-point.
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-channel_coupling> I<boolean>
yading@10: 
yading@10: Enables/Disables use of channel coupling, which is an optional AC-3 feature
yading@10: that increases quality by combining high frequency information from multiple
yading@10: channels into a single channel. The per-channel high frequency information is
yading@10: sent with less accuracy in both the frequency and time domains. This allows
yading@10: more bits to be used for lower frequencies while preserving enough information
yading@10: to reconstruct the high frequencies. This option is enabled by default for the
yading@10: floating-point encoder and should generally be left as enabled except for
yading@10: testing purposes or to increase encoding speed.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<-1>
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: Selected by Encoder (default)
yading@10: 
yading@10: =item B<0>
yading@10: 
yading@10: 
yading@10: =item B<off>
yading@10: 
yading@10: Disable Channel Coupling
yading@10: 
yading@10: =item B<1>
yading@10: 
yading@10: 
yading@10: =item B<on>
yading@10: 
yading@10: Enable Channel Coupling
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<-cpl_start_band> I<number>
yading@10: 
yading@10: Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a
yading@10: value higher than the bandwidth is used, it will be reduced to 1 less than the
yading@10: coupling end band. If I<auto> is used, the start band will be determined by
yading@10: the encoder based on the bit rate, sample rate, and channel layout. This option
yading@10: has no effect if channel coupling is disabled.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<-1>
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: Selected by Encoder (default)
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 VIDEO ENCODERS
yading@10: 
yading@10: 
yading@10: A description of some of the currently available video encoders
yading@10: follows.
yading@10: 
yading@10: 
yading@10: =head2 libtheora
yading@10: 
yading@10: 
yading@10: Theora format supported through libtheora.
yading@10: 
yading@10: Requires the presence of the libtheora headers and library during
yading@10: configuration. You need to explicitly configure the build with
yading@10: C<--enable-libtheora>.
yading@10: 
yading@10: 
yading@10: =head3 Options
yading@10: 
yading@10: 
yading@10: The following global options are mapped to internal libtheora options
yading@10: which affect the quality and the bitrate of the encoded stream.
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<b>
yading@10: 
yading@10: Set the video bitrate, only works if the C<qscale> flag in
yading@10: B<flags> is not enabled.
yading@10: 
yading@10: 
yading@10: =item B<flags>
yading@10: 
yading@10: Used to enable constant quality mode encoding through the
yading@10: B<qscale> flag, and to enable the C<pass1> and C<pass2>
yading@10: modes.
yading@10: 
yading@10: 
yading@10: =item B<g>
yading@10: 
yading@10: Set the GOP size.
yading@10: 
yading@10: 
yading@10: =item B<global_quality>
yading@10: 
yading@10: Set the global quality in lambda units, only works if the
yading@10: C<qscale> flag in B<flags> is enabled. The value is clipped
yading@10: in the [0 - 10*C<FF_QP2LAMBDA>] range, and then multiplied for 6.3
yading@10: to get a value in the native libtheora range [0-63]. A higher value
yading@10: corresponds to a higher quality.
yading@10: 
yading@10: For example, to set maximum constant quality encoding with
yading@10: B<ffmpeg>:
yading@10: 	
yading@10: 	ffmpeg -i INPUT -flags:v qscale -global_quality:v "10*QP2LAMBDA" -codec:v libtheora OUTPUT.ogg
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head2 libvpx
yading@10: 
yading@10: 
yading@10: VP8 format supported through libvpx.
yading@10: 
yading@10: Requires the presence of the libvpx headers and library during configuration.
yading@10: You need to explicitly configure the build with C<--enable-libvpx>.
yading@10: 
yading@10: 
yading@10: =head3 Options
yading@10: 
yading@10: 
yading@10: Mapping from FFmpeg to libvpx options with conversion notes in parentheses.
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<threads>
yading@10: 
yading@10: g_threads
yading@10: 
yading@10: 
yading@10: =item B<profile>
yading@10: 
yading@10: g_profile
yading@10: 
yading@10: 
yading@10: =item B<vb>
yading@10: 
yading@10: rc_target_bitrate
yading@10: 
yading@10: 
yading@10: =item B<g>
yading@10: 
yading@10: kf_max_dist
yading@10: 
yading@10: 
yading@10: =item B<keyint_min>
yading@10: 
yading@10: kf_min_dist
yading@10: 
yading@10: 
yading@10: =item B<qmin>
yading@10: 
yading@10: rc_min_quantizer
yading@10: 
yading@10: 
yading@10: =item B<qmax>
yading@10: 
yading@10: rc_max_quantizer
yading@10: 
yading@10: 
yading@10: =item B<bufsize, vb>
yading@10: 
yading@10: rc_buf_sz
yading@10: C<(bufsize * 1000 / vb)>
yading@10: 
yading@10: rc_buf_optimal_sz
yading@10: C<(bufsize * 1000 / vb * 5 / 6)>
yading@10: 
yading@10: 
yading@10: =item B<rc_init_occupancy, vb>
yading@10: 
yading@10: rc_buf_initial_sz
yading@10: C<(rc_init_occupancy * 1000 / vb)>
yading@10: 
yading@10: 
yading@10: =item B<rc_buffer_aggressivity>
yading@10: 
yading@10: rc_undershoot_pct
yading@10: 
yading@10: 
yading@10: =item B<skip_threshold>
yading@10: 
yading@10: rc_dropframe_thresh
yading@10: 
yading@10: 
yading@10: =item B<qcomp>
yading@10: 
yading@10: rc_2pass_vbr_bias_pct
yading@10: 
yading@10: 
yading@10: =item B<maxrate, vb>
yading@10: 
yading@10: rc_2pass_vbr_maxsection_pct
yading@10: C<(maxrate * 100 / vb)>
yading@10: 
yading@10: 
yading@10: =item B<minrate, vb>
yading@10: 
yading@10: rc_2pass_vbr_minsection_pct
yading@10: C<(minrate * 100 / vb)>
yading@10: 
yading@10: 
yading@10: =item B<minrate, maxrate, vb>
yading@10: 
yading@10: C<VPX_CBR>
yading@10: C<(minrate == maxrate == vb)>
yading@10: 
yading@10: 
yading@10: =item B<crf>
yading@10: 
yading@10: C<VPX_CQ>, C<VP8E_SET_CQ_LEVEL>
yading@10: 
yading@10: 
yading@10: =item B<quality>
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item I<best>
yading@10: 
yading@10: C<VPX_DL_BEST_QUALITY>
yading@10: 
yading@10: =item I<good>
yading@10: 
yading@10: C<VPX_DL_GOOD_QUALITY>
yading@10: 
yading@10: =item I<realtime>
yading@10: 
yading@10: C<VPX_DL_REALTIME>
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<speed>
yading@10: 
yading@10: C<VP8E_SET_CPUUSED>
yading@10: 
yading@10: 
yading@10: =item B<nr>
yading@10: 
yading@10: C<VP8E_SET_NOISE_SENSITIVITY>
yading@10: 
yading@10: 
yading@10: =item B<mb_threshold>
yading@10: 
yading@10: C<VP8E_SET_STATIC_THRESHOLD>
yading@10: 
yading@10: 
yading@10: =item B<slices>
yading@10: 
yading@10: C<VP8E_SET_TOKEN_PARTITIONS>
yading@10: 
yading@10: 
yading@10: =item B<max-intra-rate>
yading@10: 
yading@10: C<VP8E_SET_MAX_INTRA_BITRATE_PCT>
yading@10: 
yading@10: 
yading@10: =item B<force_key_frames>
yading@10: 
yading@10: C<VPX_EFLAG_FORCE_KF>
yading@10: 
yading@10: 
yading@10: =item B<Alternate reference frame related>
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<vp8flags altref>
yading@10: 
yading@10: C<VP8E_SET_ENABLEAUTOALTREF>
yading@10: 
yading@10: =item I<arnr_max_frames>
yading@10: 
yading@10: C<VP8E_SET_ARNR_MAXFRAMES>
yading@10: 
yading@10: =item I<arnr_type>
yading@10: 
yading@10: C<VP8E_SET_ARNR_TYPE>
yading@10: 
yading@10: =item I<arnr_strength>
yading@10: 
yading@10: C<VP8E_SET_ARNR_STRENGTH>
yading@10: 
yading@10: =item I<rc_lookahead>
yading@10: 
yading@10: g_lag_in_frames
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<vp8flags error_resilient>
yading@10: 
yading@10: g_error_resilient
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: For more information about libvpx see:
yading@10: E<lt>B<http://www.webmproject.org/>E<gt>
yading@10: 
yading@10: 
yading@10: =head2 libx264
yading@10: 
yading@10: 
yading@10: x264 H.264/MPEG-4 AVC encoder wrapper
yading@10: 
yading@10: Requires the presence of the libx264 headers and library during
yading@10: configuration. You need to explicitly configure the build with
yading@10: C<--enable-libx264>.
yading@10: 
yading@10: x264 supports an impressive number of features, including 8x8 and 4x4 adaptive
yading@10: spatial transform, adaptive B-frame placement, CAVLC/CABAC entropy coding,
yading@10: interlacing (MBAFF), lossless mode, psy optimizations for detail retention
yading@10: (adaptive quantization, psy-RD, psy-trellis).
yading@10: 
yading@10: The FFmpeg wrapper provides a mapping for most of them using global options
yading@10: that match those of the encoders and provides private options for the unique
yading@10: encoder options. Additionally an expert override is provided to directly pass
yading@10: a list of key=value tuples as accepted by x264_param_parse.
yading@10: 
yading@10: 
yading@10: =head3 Option Mapping
yading@10: 
yading@10: 
yading@10: The following options are supported by the x264 wrapper, the x264-equivalent
yading@10: options follow the FFmpeg ones.
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<b                  :  bitrate>
yading@10: 
yading@10: FFmpeg C<b> option is expressed in bits/s, x264 C<bitrate> in kilobits/s.
yading@10: 
yading@10: =item B<bf                 :  bframes>
yading@10: 
yading@10: Maximum number of B-frames.
yading@10: 
yading@10: =item B<g                  :  keyint>
yading@10: 
yading@10: Maximum GOP size.
yading@10: 
yading@10: =item B<qmin               :  qpmin>
yading@10: 
yading@10: 
yading@10: =item B<qmax               :  qpmax>
yading@10: 
yading@10: 
yading@10: =item B<qdiff              :  qpstep>
yading@10: 
yading@10: 
yading@10: =item B<qblur              :  qblur>
yading@10: 
yading@10: 
yading@10: =item B<qcomp              :  qcomp>
yading@10: 
yading@10: 
yading@10: =item B<refs               :  ref>
yading@10: 
yading@10: 
yading@10: =item B<sc_threshold       :  scenecut>
yading@10: 
yading@10: 
yading@10: =item B<trellis            :  trellis>
yading@10: 
yading@10: 
yading@10: =item B<nr                 :  nr>
yading@10: 
yading@10: Noise reduction.
yading@10: 
yading@10: =item B<me_range           :  merange>
yading@10: 
yading@10: 
yading@10: =item B<me_method          :  me>
yading@10: 
yading@10: 
yading@10: =item B<subq               :  subme>
yading@10: 
yading@10: 
yading@10: =item B<b_strategy         :  b-adapt>
yading@10: 
yading@10: 
yading@10: =item B<keyint_min         :  keyint-min>
yading@10: 
yading@10: 
yading@10: =item B<coder              :  cabac>
yading@10: 
yading@10: Set coder to C<ac> to use CABAC.
yading@10: 
yading@10: =item B<cmp                :  chroma-me>
yading@10: 
yading@10: Set to C<chroma> to use chroma motion estimation.
yading@10: 
yading@10: =item B<threads            :  threads>
yading@10: 
yading@10: 
yading@10: =item B<thread_type        :  sliced_threads>
yading@10: 
yading@10: Set to C<slice> to use sliced threading instead of frame threading.
yading@10: 
yading@10: =item B<flags -cgop        :  open-gop>
yading@10: 
yading@10: Set C<-cgop> to use recovery points to close GOPs.
yading@10: 
yading@10: =item B<rc_init_occupancy  :  vbv-init>
yading@10: 
yading@10: Initial buffer occupancy.
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head3 Private Options
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<-preset> I<string>
yading@10: 
yading@10: Set the encoding preset (cf. x264 --fullhelp).
yading@10: 
yading@10: =item B<-tune> I<string>
yading@10: 
yading@10: Tune the encoding params (cf. x264 --fullhelp).
yading@10: 
yading@10: =item B<-profile> I<string>
yading@10: 
yading@10: Set profile restrictions (cf. x264 --fullhelp).
yading@10: 
yading@10: =item B<-fastfirstpass> I<integer>
yading@10: 
yading@10: Use fast settings when encoding first pass.
yading@10: 
yading@10: =item B<-crf> I<float>
yading@10: 
yading@10: Select the quality for constant quality mode.
yading@10: 
yading@10: =item B<-crf_max> I<float>
yading@10: 
yading@10: In CRF mode, prevents VBV from lowering quality beyond this point.
yading@10: 
yading@10: =item B<-qp> I<integer>
yading@10: 
yading@10: Constant quantization parameter rate control method.
yading@10: 
yading@10: =item B<-aq-mode> I<integer>
yading@10: 
yading@10: AQ method
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<variance>
yading@10: 
yading@10: Variance AQ (complexity mask).
yading@10: 
yading@10: =item B<autovariance>
yading@10: 
yading@10: Auto-variance AQ (experimental).
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<-aq-strength> I<float>
yading@10: 
yading@10: AQ strength, reduces blocking and blurring in flat and textured areas.
yading@10: 
yading@10: =item B<-psy> I<integer>
yading@10: 
yading@10: Use psychovisual optimizations.
yading@10: 
yading@10: =item B<-psy-rd> I<string>
yading@10: 
yading@10: Strength of psychovisual optimization, in E<lt>psy-rdE<gt>:E<lt>psy-trellisE<gt> format.
yading@10: 
yading@10: =item B<-rc-lookahead> I<integer>
yading@10: 
yading@10: Number of frames to look ahead for frametype and ratecontrol.
yading@10: 
yading@10: =item B<-weightb> I<integer>
yading@10: 
yading@10: Weighted prediction for B-frames.
yading@10: 
yading@10: =item B<-weightp> I<integer>
yading@10: 
yading@10: Weighted prediction analysis method.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<simple>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<smart>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<-ssim> I<integer>
yading@10: 
yading@10: Calculate and print SSIM stats.
yading@10: 
yading@10: =item B<-intra-refresh> I<integer>
yading@10: 
yading@10: Use Periodic Intra Refresh instead of IDR frames.
yading@10: 
yading@10: =item B<-b-bias> I<integer>
yading@10: 
yading@10: Influences how often B-frames are used.
yading@10: 
yading@10: =item B<-b-pyramid> I<integer>
yading@10: 
yading@10: Keep some B-frames as references.
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<strict>
yading@10: 
yading@10: Strictly hierarchical pyramid.
yading@10: 
yading@10: =item B<normal>
yading@10: 
yading@10: Non-strict (not Blu-ray compatible).
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<-mixed-refs> I<integer>
yading@10: 
yading@10: One reference per partition, as opposed to one reference per macroblock.
yading@10: 
yading@10: =item B<-8x8dct> I<integer>
yading@10: 
yading@10: High profile 8x8 transform.
yading@10: 
yading@10: =item B<-fast-pskip> I<integer>
yading@10: 
yading@10: 
yading@10: =item B<-aud> I<integer>
yading@10: 
yading@10: Use access unit delimiters.
yading@10: 
yading@10: =item B<-mbtree> I<integer>
yading@10: 
yading@10: Use macroblock tree ratecontrol.
yading@10: 
yading@10: =item B<-deblock> I<string>
yading@10: 
yading@10: Loop filter parameters, in E<lt>alpha:betaE<gt> form.
yading@10: 
yading@10: =item B<-cplxblur> I<float>
yading@10: 
yading@10: Reduce fluctuations in QP (before curve compression).
yading@10: 
yading@10: =item B<-partitions> I<string>
yading@10: 
yading@10: A comma-separated list of partitions to consider, possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all.
yading@10: 
yading@10: =item B<-direct-pred> I<integer>
yading@10: 
yading@10: Direct MV prediction mode
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<spatial>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<temporal>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: =item B<-slice-max-size> I<integer>
yading@10: 
yading@10: Limit the size of each slice in bytes.
yading@10: 
yading@10: =item B<-stats> I<string>
yading@10: 
yading@10: Filename for 2 pass stats.
yading@10: 
yading@10: =item B<-nal-hrd> I<integer>
yading@10: 
yading@10: Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4).
yading@10: 
yading@10: Possible values:
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<none>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<vbr>
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<cbr>
yading@10: 
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<x264opts> I<options>
yading@10: 
yading@10: Allow to set any x264 option, see C<x264 --fullhelp> for a list.
yading@10: 
yading@10: I<options> is a list of I<key>=I<value> couples separated by
yading@10: ":". In I<filter> and I<psy-rd> options that use ":" as a separator
yading@10: themselves, use "," instead. They accept it as well since long ago but this
yading@10: is kept undocumented for some reason.
yading@10: 
yading@10: For example to specify libx264 encoding options with B<ffmpeg>:
yading@10: 	
yading@10: 	ffmpeg -i foo.mpg -vcodec libx264 -x264opts keyint=123:min-keyint=20 -an out.mkv
yading@10: 
yading@10: 
yading@10: For more information about libx264 and the supported options see:
yading@10: E<lt>B<http://www.videolan.org/developers/x264.html>E<gt>
yading@10: 
yading@10: 
yading@10: =item B<-x264-params> I<string>
yading@10: 
yading@10: Override the x264 configuration using a :-separated list of key=value parameters.
yading@10: 	
yading@10: 	-x264-params level=30:bframes=0:weightp=0:cabac=0:ref=1:vbv-maxrate=768:vbv-bufsize=2000:analyse=all:me=umh:no-fast-pskip=1:subq=6:8x8dct=0:trellis=0
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: Encoding avpresets for common usages are provided so they can be used with the
yading@10: general presets system (e.g. passing the C<-pre> option).
yading@10: 
yading@10: 
yading@10: =head2 ProRes
yading@10: 
yading@10: 
yading@10: Apple ProRes encoder.
yading@10: 
yading@10: FFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder.
yading@10: The used encoder can be choosen with the C<-vcodec> option.
yading@10: 
yading@10: 
yading@10: =head3 Private Options for prores-ks
yading@10: 
yading@10: 
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<profile> I<integer>
yading@10: 
yading@10: Select the ProRes profile to encode
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<proxy>
yading@10: 
yading@10: 
yading@10: =item B<lt>
yading@10: 
yading@10: 
yading@10: =item B<standard>
yading@10: 
yading@10: 
yading@10: =item B<hq>
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =item B<quant_mat> I<integer>
yading@10: 
yading@10: Select quantization matrix.
yading@10: 
yading@10: =over 4
yading@10: 
yading@10: 
yading@10: =item B<auto>
yading@10: 
yading@10: 
yading@10: =item B<default>
yading@10: 
yading@10: 
yading@10: =item B<proxy>
yading@10: 
yading@10: 
yading@10: =item B<lt>
yading@10: 
yading@10: 
yading@10: =item B<standard>
yading@10: 
yading@10: 
yading@10: =item B<hq>
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: If set to I<auto>, the matrix matching the profile will be picked.
yading@10: If not set, the matrix providing the highest quality, I<default>, will be
yading@10: picked.
yading@10: 
yading@10: 
yading@10: =item B<bits_per_mb> I<integer>
yading@10: 
yading@10: How many bits to allot for coding one macroblock. Different profiles use
yading@10: between 200 and 2400 bits per macroblock, the maximum is 8000.
yading@10: 
yading@10: 
yading@10: =item B<mbs_per_slice> I<integer>
yading@10: 
yading@10: Number of macroblocks in each slice (1-8); the default value (8)
yading@10: should be good in almost all situations.
yading@10: 
yading@10: 
yading@10: =item B<vendor> I<string>
yading@10: 
yading@10: Override the 4-byte vendor ID.
yading@10: A custom vendor ID like I<apl0> would claim the stream was produced by
yading@10: the Apple encoder.
yading@10: 
yading@10: 
yading@10: =back
yading@10: 
yading@10: 
yading@10: 
yading@10: =head3 Speed considerations
yading@10: 
yading@10: 
yading@10: In the default mode of operation the encoder has to honor frame constraints
yading@10: (i.e. not produc frames with size bigger than requested) while still making
yading@10: output picture as good as possible.
yading@10: A frame containing a lot of small details is harder to compress and the encoder
yading@10: would spend more time searching for appropriate quantizers for each slice.
yading@10: 
yading@10: Setting a higher B<bits_per_mb> limit will improve the speed.
yading@10: 
yading@10: For the fastest encoding speed set the B<qscale> parameter (4 is the
yading@10: recommended value) and do not set a size constraint.
yading@10: 
yading@10: 
yading@10: 
yading@10: =head1 SEE ALSO
yading@10: 
yading@10: 
yading@10: 
yading@10: ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavcodec(3)
yading@10: 
yading@10: 
yading@10: =head1 AUTHORS
yading@10: 
yading@10: 
yading@10: The FFmpeg developers.
yading@10: 
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: B<git log> in the FFmpeg source directory, or browsing the
yading@10: online repository at E<lt>B<http://source.ffmpeg.org>E<gt>.
yading@10: 
yading@10: Maintainers for the specific components are listed in the file
yading@10: F<MAINTAINERS> in the source code tree.
yading@10: 
yading@10: 
yading@10: