Live TV - Owncast/OBS Live Stream

[timminator]

Hi there!

Coincidentally I ran into the same exact problem this morning. :-)
I was able to find a solution. My .m3u8 file looked exactly as yours.
I compared it against other .m3u8 files online that are working in jellyfin and noticed that the .m3u8 file from owncast is missing the EXTINF line that jellyfin uses to identify the stream. So i made a modified .m3u8-file and added it afterwards inside jellyfin. It should look like this:

#EXTM3U
#EXTINF:-1,YourStreamNameHere
http://YourLivestream.domain.org/hls/stream.m3u8

Afterwards you can find the livestream using your specified stream name under Live TV -> Channels.

Hope this helps you aswell. :-)