SOLVED: Trickplay generation only running single threaded

[TimeLabs]

Hi there, 
I've just enabled trickplay images on my server it's been running for 2 days now with only 56% done. I have 2.78 TB of media.  When I checked htop I saw that its only using one core / thread and the CPU is constantly at 88°C.
Is it possible to enable multithreading somewhere or do I have to live with that the way it is?

I'm running Jellyfin 10.9.11 inside of Docker on Ubuntu Server 22.04.4 LTS on a mini pc with an I5-12450H and 16GB RAM with hardware acceleration configured and enabled.

[gnattu]

Dashboard -> Playback -> Trickplay then you will find ffmpeg threads settings at the bottom.

[TimeLabs]

Awesome, I activated HW acceleration and set the threads to 8, its way faster now. Thanks!