Vorbis
Vorbis is a completely open, patent and royalty free, professional audio codec comparable to MP3 and AAC. It is used for music, games, etc and has become the default audio format for WebM.
Options
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Quality (0 - 1)
Set a specific audio quality (recommended). Default is 0.3.
quality=0.5
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Bitrate (number)
Set a specific bitrate to control file size. Default is unset.
bitrate=128000
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Min-bitrate (number)
Set the minimum allowed bitrate. Default is unset.
min-bitrate=64000
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Max-bitrate> (number)
Set the maximum allowed bitrate. Default is unset.
max-bitrate=192000