(requires ffmpeg or avconv and ffprobe or
avprobe)
--audio-format FORMAT Specify audio format: "best", "aac",
- "vorbis", "mp3", "m4a", "opus", or "wav";
- "best" by default; No effect without -x
+ "flac", "mp3", "m4a", "opus", "vorbis", or
+ "wav"; "best" by default; No effect without
+ -x
--audio-quality QUALITY Specify ffmpeg/avconv audio quality, insert
a value between 0 (better) and 9 (worse)
for VBR or a specific bitrate like 128K