Jellyfin-Client for TV

[bitmap]

You could run an Intel NUC or older Intel-based Mac Mini. Fairly sure they made them recently enough they'd have QSV. The latter you'd probably have more power but also way more TDP and probably zero chance at repair. The logic boards for those things are still available but like $900 a pop. They're also fairly large and heavy. But they're almost bulletproof; my Mini ran for 12 years, 2 of them as a Jellyfin/docker server on 24/7. They're also silent and you can find really cool mounting solutions (I have a wall mount where my Mini just snaps in to this plastic holder, it's awesome).

Either way you'd ensure enough power that your client could decode.