OptionalqscaleVBR quality, 0 (best) to 9 (worst). Enables VBR.
OptionalbitrateTarget bitrate in kbps (CBR)
OptionalcompressionCompression level for encoder internals, 0–9
OptionalreservoirReservoir size
OptionaljointJoint stereo encoding
OptionalabrABR (average bitrate) mode
OptionalsampleSample rate
OptionalchannelsChannels
Typed options for libmp3lame encoder. Derived from
ffmpeg -h encoder=libmp3lamedump.