[MicTie]

 

 If you can upload small video with artifacts, it would be helpful. I did my testing, and can't reproduce it on my device.

After a complete new installation with Ubuntu 18.04 and the most recent Jetpack4.6 I am able to narrow down the artifacts issue.
Changing the Player Settings to Videos -> Playback -> Adjust display refresh rate -> Off: no artifacts in most videos, some artifacts in streamed videos (eg YouTube ...). 
All other (Always, On start/stop, On start) show strong artifacts.

I am happy to have a working setup
Thanks