Video is broken solve it, I use Ubuntu Mate.
Do you mean you experience "screen tearing" when you play videos or scroll?
If so, which graphics card and driver do you use? Is this on Ubuntu MATE 18.04?
There are a few topics around, depending on the graphics card, like an NVIDIA with proprietary drivers:
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Graphics Card AMD, and OS Ubuntu Mate 19.04 (Disco Dingo) 64-bit
Try changing the window manager in 
MATE Tweak:
If this doesn't help, try this suggestion:
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