Comment 12 for bug 1845102

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Daniel van Vugt (vanvugt) wrote : Re: [radeon] Video tearing in Gnome-MPV/Celluloid in Xorg sessions (but not Wayland)

The Z shape is characteristic of some graphics drivers. It's not a problem in the driver but it does suggest the app is displaying half-finished frames (on top of the previous frame).

So next I recommend trying different MPV command line options to change the rendering/decoding method. Sorry I don't know any more details...