I’ll be honest op if it’s on a TV I use the newer fire sticks with the jellyfin app. They already have support for various codecs and stream from my server just fine. Cheap too and come with a remote.

If I were just trying to get a home made client up I would consider Debian bookworm and just utilize the Deb from the GitHub link here…

jellyfin.org/downloads/clients/

Personally I’d throw on cockpit to make remote administration a bit easier and setup an auto start at login for the jellyfin media player with the startup apps. You can even add a launch variable to launch it full screen like…

jellyfin --fullscreen

The media player doesn’t really need special privileges so you could create a basic user account just for jellyfin.