OptionalqscaleVBR quality, -1 (lowest) to 10 (highest)
OptionalbitrateTarget bitrate in kbps (CBR/ABR)
OptionalminrateMinimum bitrate in kbps
OptionalmaxrateMaximum bitrate in kbps
OptionalcutoffCutoff frequency in Hz
OptionalsampleSample rate
OptionalchannelsChannels
Typed options for libvorbis encoder. Derived from
ffmpeg -h encoder=libvorbisdump.