MovieNight VS Project-Lightspeed

I remember looking at MovieNight in the past, but I never deployed it so I can't speak to whether it will work for you or not.

Jellyfin supports "Watch parties" which I've used for movie nights in the past. It works well enough.

But if you want this going real-time and continuously it sounds like you want more of an RTMP stream setup. I recommend MovieNight[0] but you can handle it natively in Nginx I think. Then it's just a matter of setting up OBS[1] or something similar to stream to it and you can do whatever you want.

[0] https://github.com/zorchenhimer/MovieNight

You could always host your own, and forward the M3U through an RTMP server https://github.com/zorchenhimer/MovieNight

Depending on how you want to achieve this, you could use a combination of OBS + Restreamer or OBS + Project-Lightspeed. Another solution would be to use more specific solutions like neko

I also used to use Project-Lightspeed, which worked great. I abandoned it because I wanted to get off of FTL based on the OBS thread above. It otherwise worked for me.

https://github.com/GRVYDEV/Project-Lightspeed is a 'Twitch like' server that does FTL input from OBS. You can run OBS on the Ubuntu desktop and do a desktop capture. Viewers can then watch on the 'Project Lightspeed' host.

I recommend Project-Lightspeed for this. It uses the FTL protocol (similar to the now defunct Mixer) with WebRTC for great latency. I've used it many times for streaming games, etc. and it works well.

Special thanks to the Ryujinx Discord for helping me test and to the Lightspeed Project (https://github.com/GRVYDEV/Project-Lightspeed)!

jellyfin can certainly do what you are looking for, but it seems like you probably don't have enough bandwidth to reliably host the service at home, and may be overkill for your usage... you could set up project lightspeed (https://github.com/GRVYDEV/Project-Lightspeed) on a $5/month VPS and use OBS to stream video with sub 1 second latency, you can install teamspeak or mumble or something on the same VPS for voice chat.