name	format	default bitrate (kilobits/s)	description
mp3	mp3	128 kb/s	transcode to mp3 at 128 kb/s
mp3_rg	mp3	128 kb/s	transcode to mp3 at 128 kb/s, force replay gain, strip replay gain tags
opus	opus	96 kb/s	transcode to opus at 96 kb/s (see recommended bitrates)
opus_rg	opus	96 kb/s	transcode to opus at 96 kb/s, force replay gain, strip replay gain metadata
opus_car	opus	96 kb/s	same as above, but with a higher target baseline gain. good for listening in loud enironments like a car
opus_128	opus	128 kb/s	transcode to opus at 128 kb/s (see recommended bitrates)
opus_128_rg	opus	128 kb/s	transcode to opus at 128 kb/s, force replay gain, strip replay gain metadata
opus_128_car	opus	128 kb/s	same as above, but with a higher target baseline gain. good for listening in loud enironments like a car
opus_192	opus	192 kb/s	transcode to opus at 192 kb/s (see recommended bitrates)

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most of these profiles subprocess ffmpeg. to see the flags used, see transcode.go 👀