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[TheDreadPirate]

In the system tray, click on the shield to bring up Windows Security, Virus and threat protection, manage settings under Virus and thread protection settings, at the bottom under Exclusions click add or remove exclusions, add process jellyfin.exe.

   
   
   
   

I don't know for certain that this will help. I had already migrated to Linux by the time I discovered this exclusion process. But I remember that Windows Defender would use up like 30-50% of my CPU when I was direct playing.

[Veoxer]

Thank you very much, I did this but it didn't really change anything And I had this exact same problem on linux too for this type of files. What I noticed is that for example this video file plays just fine :

[TheDreadPirate]

Can you share your Jellyfin logs with us via pastebin?