RESOLVED FIXED 283235
VideoMediaSampleRenderer will produce out of order, corrupted frame when used with b-frames. 
https://bugs.webkit.org/show_bug.cgi?id=283235
Summary VideoMediaSampleRenderer will produce out of order, corrupted frame when used...
Jean-Yves Avenard [:jya]
Reported 2024-11-16 14:41:11 PST
In https://commits.webkit.org/286106@main (bug 281497) we added support for decoding through a queue to keep track of decoded images by the VideoMediaSampleRenderer. This introduced two issues: 1- The queue used to feed the decoder is a CMBufferQueue which re-order samples in presentation order. So we end up feeding the decoder the frames in presentation order rather than decode order. This causes decoded buffer to be corrupted when using it with H264/H265 content that contains B-frames. 2- The way the WebCoreDecompression is used by the VideoMediaSampleRenderer, it will output frames in decode order which are then fed to an AVSampleBufferDisplay. So we end up having frames being displayed out of order.
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Radar WebKit Bug Importer
Comment 1 2024-11-16 14:41:33 PST
<rdar://problem/140046888>
Jean-Yves Avenard [:jya]
Comment 2 2024-11-17 05:00:18 PST
Pull request: https://github.com/WebKit/WebKit/pull/36770
EWS
Comment 3 2024-11-18 04:23:04 PST
Committed 286719@main (ad4c63c079db): <https://commits.webkit.org/286719@main> Reviewed commits have been landed. Closing PR #36770 and removing active labels.
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