I had been doing Twitch streaming seven years ago (so, RTSP, if I recall correctly) with an ffmpeg script I wrote.

https://github.com/tcarrio/ffmpeg-streamcast/blob/master/bas...

Also, seven years, and I eventually ended up moving to OBS instead of diving even further, but that was working at the time.

However, it won't give you any pointers for using AV1, and this is just the streaming source, you'll still need an RTSP server and clients to access them.