rmader, to random
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After some more debugging, here are two videos proving that / video playback with fullscreen GL/VK overlay works on a and / on / , each maxing out their video decoders with 1080p@60 and 4k@60 respectively.

The message here is: no matter what hardware - if you want to make a video/camera app that needs to be highly efficient, you can do it with a proper, yet still lightweight toolkit now. No need for a custom kms/drm backend.

The GTK4 demo video player on a Raspberry 4, playing BBB. The camera moves over to another screen with Weston debug output, showing that the compositor uses hardware planes, which is needed for optimal playback performance.
The GTK4 demo video player on a Pinebook Pro (using a RK3399 SoC), playing BBB. The camera moves over to another screen with Weston debug output, showing that the compositor uses hardware planes, which is needed for optimal playback performance.

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