You can create a tmpfs on other storage devices as well, just curious what their setup looked like

From personal experience intel QSV wasn’t worth the trouble to txshoot on my hardware. Mine is a lot older than yours though. Vaapi has worked well on my arc card

Is the tmpfs on RAM?

Excellent choice. My jellyfin server is great, there are buggy things but I’m committed to the foss lifestyle

What software are you using to self host and serve your library?