Rock 4 SE & Debian, Kodi moviews jerk

Hello,
first of all I am quite a beginner in Linux/Debian.
I have a Rock 4 SE here with Debian Bullseye and I want to run Kodi.

One problem is that the movies jerk when playing.
For testing I used libreelec and the movies run smoothly.

What can I do so that it also runs well on Debian?
Hope you can help

Saw another person mention jerky video on YouTube also: