This is why I moved to Emby. I use a different player on all my devices and all my content is HEVC or H264 with AAC or DTS so never an issue playing. No need for premium either.
Jellyfin is on fumes. They made a call for help a couple of years ago but since then, haven’t had much of any. They found a critical bug last build I think and where supposed to disclose the details around the end of last year and it’s May now. No news.
There’s a ton broken and no one to really fix it. I remember posting about a bug and a long standing contributor just basically blamed the scraper and said well that scraper is shit.
I got the sense most of the older crew just gate keep but don’t actually work towards making the thing better.
It sucks really. I would have preferred open source projects don’t shut down. I guess it is what it is.