thanks for your fantastic guide @RetroResolution , I got it working with almost no problems.
However what I am experiencing with my Pi model 3 / 10,000kbit upload bandwidth (wlan though) is that my emulator stutters/lags slightly to badly in intervals of 20 minutes or so, and the stream was cut off completely after 2 hours. Cpu temperature/load and memory load were all good. At first I thought it might be related to me not using a real storage instead of the SD card but the swap file is always size 0 (using YARMan Web to check). I looked for some sort of logs but couldn't find anything relevant (runcommand.log has no errors). I already tried increasing the buffer size but that didn't do anything good.
Does anyone have an idea what this could be?
Btw I also found a -hwaccel option in ffmpeg which is disabled by default although there would be devices available. Would that be advisable? Couldn't figure out how to correctly use this though ("stream specifier"?)