The issue is compositing in the window manager.
If compositing is enabled the video WILL tear. If compositing is disabled the videos display correctly.
Definitely the case for xfce4. -- Anton R. Ivanov https://www.kot-begemot.co.uk/
I found the underlying root cause and the fix by chance when trawling
the web for something else.
- Bug#878170: Problem elsewhere, you can close it Anton Ivanov
- Bug#878170: Problem elsewhere, you can close it Michel Dänzer
