I'm using the Android tv app of Jellyfin.
I usually have to select the subtitles twice. The first time I select subtitles, it will take a long time and eventually there will be an error message and no subtitles. If I then go in and select the same subtitles again, it usually works immediately.
Is this a known problem and is there anything I can do to remedy the problem?
Underpowered server is what I suspect. It's taking too long to extract subtitles that it times out. Subsequent requests will work as the result is cached once it eventually finishes.
My workaround was to use external subtitles to remove the need to extract. If you're using the *arrs checkout bazarr.
My server should have the needed power but I'll definitely investigate the docker setup to make sure that the jellyfin container is not unintentionally limited.
I've been meaning to check out bazarr and if external subtitles turn out to behave better, that will be on my to do list.
I have the same situation.. Only external subtitles load..I have the same guess that is my potato server's fault. Now I just use external subtitles from bazarr