help='convert video files to audio-only files (requires ffmpeg or avconv and ffprobe or avprobe)')
postproc.add_option('--audio-format', metavar='FORMAT', dest='audioformat', default='best',
help='"best", "aac", "vorbis", "mp3", "m4a", or "wav"; best by default')
help='convert video files to audio-only files (requires ffmpeg or avconv and ffprobe or avprobe)')
postproc.add_option('--audio-format', metavar='FORMAT', dest='audioformat', default='best',
help='"best", "aac", "vorbis", "mp3", "m4a", or "wav"; best by default')