If supported_codecs isn't set, you'll get h264, but as of Jan 8th, 2023, Twitch has added the ability to stream with 2 additional codecs h265 and av1 (in chromium: &supported_codecs=av1,h265,h264).
If a stream uses any of the new codecs, and supported_codecs has to be set accordingly, or else you can't get source. I think it's probably best to enable all by default, but have some exclusion/override config, as a user may not want av1 or h265.
There was a streamer r0dn3y who had it earlier today, not sure of others.
If
supported_codecsisn't set, you'll geth264, but as of Jan 8th, 2023, Twitch has added the ability to stream with 2 additional codecsh265andav1(in chromium:&supported_codecs=av1,h265,h264). If a stream uses any of the new codecs, andsupported_codecshas to be set accordingly, or else you can't get source. I think it's probably best to enable all by default, but have some exclusion/override config, as a user may not wantav1orh265. There was a streamerr0dn3ywho had it earlier today, not sure of others.