[Webkit-unassigned] [Bug 253807] [GTK][GStreamer] VA+DMABuf videos flicker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253807

Zan Dobersek <zan at falconsigh.net> changed:

           What    |Removed                     |Added
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                 CC|                            |zan at falconsigh.net

--- Comment #3 from Zan Dobersek <zan at falconsigh.net> ---
I think this happens because of the GstMemory being released (or rather disposed) for decoder's reuse before the sampling of dmabufs from such GstMemory is complete.

The GstMemory is disposed as soon as the sample object is updated in MediaPlayerPrivateGStreamer::triggerRepaint(), releasing the last reference on the memory-containing buffer object. What I think is happening is the decoder can end up taking the released memory and decode into the associated dambuf even when the dmabuf is still being used for sampling on our side.

The DMABufObject we use internally has an eventfd-based mechanism for indicating release from the presentation layer, meaning we have a pretty good idea of when a given dmabuf is not sampled anymore. When this is associated somehow with the GstMemory/GstBuffer lifetime, I think the flickering should go away.

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