Trouble playing few 4K movies on AMD 5600G

[Efficient_Good_5784]

I am not transcoding. Just playing the mkv files. Disabled Hardware accleration.

Disabling HWA does not prevent transcoding. It will simply just use the CPU cores to transcode instead of the iGPU.

When you get a 4K stream that gives you issues, it's most likely transcoding. Maybe due to those specific 4K files having something  that's not compatible with the client.

If you're watching on the Jellyfin web player, you can open an info box that shows what's happening with the stream (direct play, transcoding, etc.).

You can also log into the admin dashboard to see if a client is currently getting a direct or transcoded stream.