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I don't think WebRender has anything to do with accelerated video decoding.

Here's the bug btw: https://bugzilla.mozilla.org/show_bug.cgi?id=1210727



WebRender seems to be a prerequisite for it: https://bugzilla.mozilla.org/show_bug.cgi?id=563206

> The GPU->GPU copy is only usable if you also have hardware accelerated composition.

I thought WebRender is implementing such compositor.


It is, but there was also another one in Firefox (you could enable it on Linux by setting layers.acceleration.force-enabled to true).


I suppose they didn't want to actively work on such features for something that's going to be deprecated. Since WebRender is their way forward, they can as well implement video acceleration together with it.




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