Got video playback problem with Kodi 20.1 too.
Was during my first usage of Kodi 20.1 (updated).
On my side, got my 1st "video image freeze" since Kodi 19.3.
During music video playing, i pressed "next" to go to next music video on my playlist.
The audio started and played but the image got frozen from previous music video interrupted.
Was not able to return to Kodi UI menu in my situation.
I forced a "stop-shutdown" of Kodi App from Xbox OS Interface.
After that, i changed Render Method to "DXVA" as explained here and restarted Kodi app.
Seem to fix my problem because was not able to reproduce the problem anymore with the same playlist.
I will investigate my case if the problem persist with this thread solution applied.
Thx for sharing this post