[Webkit-unassigned] [Bug 283235] New: VideoMediaSampleRenderer will produce out of order, corrupted frame when used with b-frames.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=283235

            Bug ID: 283235
           Summary: VideoMediaSampleRenderer will produce out of order,
                    corrupted frame when used with b-frames.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com

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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