You could try to use Kodi as the client / player / media center, with the jellyfin addon (and kodi-sync-something plugin on the jellyfin server side). It works great for me, plays pretty much everything, subtitles are very rarely a problem. Not everyone likes the Kodi UI, but I love it. There’s many skins available, and you can really customize it if you spend some time with it. I run Kodi on my nvidia shield connected to my TV, but in the past I have also ran it on a raspberry pi 3 with very few problems.
You could try to use Kodi as the client / player / media center, with the jellyfin addon (and kodi-sync-something plugin on the jellyfin server side). It works great for me, plays pretty much everything, subtitles are very rarely a problem. Not everyone likes the Kodi UI, but I love it. There’s many skins available, and you can really customize it if you spend some time with it. I run Kodi on my nvidia shield connected to my TV, but in the past I have also ran it on a raspberry pi 3 with very few problems.