yading@11: #!/usr/bin/env python2
yading@11: 
yading@11: import sys, subprocess
yading@11: 
yading@11: if len(sys.argv) > 1:
yading@11:     ifile  = sys.argv[1]
yading@11:     encopt = sys.argv[2:-1]
yading@11:     ofile  = sys.argv[-1]
yading@11: else:
yading@11:     print 'usage: %s <input> [encode_options] <output>' % sys.argv[0]
yading@11:     sys.exit(1)
yading@11: 
yading@11: analysis_cmd  = 'ffprobe -v error -of compact=p=0:nk=1 '
yading@11: analysis_cmd += '-show_entries frame_tags=lavfi.r128.I -f lavfi '
yading@11: analysis_cmd += "amovie='%s',ebur128=metadata=1" % ifile
yading@11: try:
yading@11:     probe_out = subprocess.check_output(analysis_cmd, shell=True)
yading@11: except subprocess.CalledProcessError, e:
yading@11:     sys.exit(e.returncode)
yading@11: loudness = ref = -23
yading@11: for line in probe_out.splitlines():
yading@11:     sline = line.rstrip()
yading@11:     if sline:
yading@11:         loudness = sline
yading@11: adjust = ref - float(loudness)
yading@11: if abs(adjust) < 0.0001:
yading@11:     print 'No normalization needed for ' + ifile
yading@11: else:
yading@11:     print "Adjust %s by %.1fdB" % (ifile, adjust)
yading@11:     norm_cmd  = ['ffmpeg', '-i', ifile, '-af', 'volume=%fdB' % adjust]
yading@11:     norm_cmd += encopt + [ofile]
yading@11:     print ' => %s' % ' '.join(norm_cmd)
yading@11:     subprocess.call(norm_cmd)