Videos are still flickering in impress under ubuntu 20.04

I have done all that is suggested in diverse web portals but nothing happens.
I dream in a very efficient way to avoid flicker.
Is there a real solution for it???

The problem seems to be there if the focus is on the display screen, which in singe or mirrored displays will always be the case. In dual screen mode, if you change the focus to the screen that isn’t displaying the video by clicking on the other screen, the flickering stops. Unfortunately this means that some of the controls that require the focus to be on the display screen don’t work until you shift the focus back.