Issues with playback

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You will need to assess individual files. Recreate the issue and provide your Jellyfin and ffmpeg logs (Dashboard > Logs) by uploading them to a pastebin site. Also helpful would be mediainfo (command line output) or ffprobe for the media, since the container and codec do not tell the whole issue.

In addition, how is the server installed? Bare metal? Docker?

Do you know the exact model of your processor? Because Gemini Lake CPU != Gemini Lake iGPU. Looking at UHD 600, it's a Celeron processor most likely. Most of them support QuickSync as far as I can tell. You'll have to check the specific product specs page for the processor to be sure.

I've been looking for a page like this forever, so I'm posting it (despite the fact that it doesn't have the 600): https://www.intel.com/content/www/us/en/...newer.html