ENABLE INTEL QUICK SYNC INSTALL
ENABLE INTEL QUICK SYNC DRIVER

Last note is, depending on which container you are using, if your LXC is Debian then you should be fine with Jellyfin 10.7.5, with Ubuntu 20.04 LXC you'll find that Quick Sync won't work even with new driver, it's due to older FFMPEG version (In Ubuntu Jellyfin bundled 4.3.1-4 while Debian has 4.3.2-1), manually updating to 4.3.2-1 will fix the problem.

ENABLE INTEL QUICK SYNC DRIVER

I owned a Celeron J4125 which is a Gemini Lake Refresh, confirmed both driver were working but of course I would go for a new one. HEVC encoding) and slower performance when compared with the newer driver. Interesting fact here is 9th Gen overlapping between these 2 drivers, and yes both of them will work, but 'i965' one has less features (e.g. Coffee Lake, Comet Lake, Gemini Lake), 9th Gen or older generation needs to use 'i965-va-driver'/'i965-va-driver-shaders' (later one is with proprietary encoding driver).

ENABLE INTEL QUICK SYNC INSTALL

If you need the real Intel Quick Sync you have to install 'intel-media-va-driver-non-free', but not from stable repo, that version is very very old, to get it work I have to install the version from 'bullseye' (which is v21.1 now).ДЄlso please note that, your Intel CPU version matters, the 'intel-media-va-driver'/'intel-media-va-driver-non-free' are for CPU 9th Gen or above (e.g. Original OP's setup will work with 'VAAPI acceleration' setting under Jellyfin, which you still get hardware acceleration but it's open sourced implementation. The company boasts that this feature can make video creation and conversion faster and easier, and is. Our collaboration with Intel has enabled us to optimize the DaVinci Resolve 17.1 application that is available now to take advantage of IntelвЂ™s built-in, dedicated, hardware-based Quick Sync Video technology on the latest 11th Gen processors to make these advanced media capabilities available to our customers, without compromising on performance. Tested with Jellyfin website's 120Mbps 4K HEVC 10bit SDR video, transcoding to 80Mbps 4K H.264, with VAAPI I get 15-20 fps but with Quick sync I can get 40fps+, which is a huge difference. Intel Quick Sync Video is the company's hardware video encoding and decoding technology. I have compared both and the proprietary Quick Sync is much faster than VAAPI implementation. There are 2 packages: intel-media-va-driver & intel-media-va-driver-non-free, the 'non-free' one is of course in 'non-free' repo, it has all functionalities of original one (decoding) + proprietary (encoding) function, which is where the Quick Sync encoding acceleration coming from. I saw this guide from the forum, however I believe it was somehow not correct, and missed some information (well, the post cannot be replied so I post some amendment here).

Enable intel quick sync