[Webkit-unassigned] [Bug 191257] New: [GStreamer][MSE] pixelated video when MSE is enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191257

            Bug ID: 191257
           Summary: [GStreamer][MSE] pixelated video when MSE is enabled
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jmason at ibinx.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 353850

  --> https://bugs.webkit.org/attachment.cgi?id=353850&action=review

MiniBrowser Screenshot

When MediaSource extensions are enabled in 2.22.3, I am getting pixelated video in YouTube whenever webm/vp9 streams are offered.  If webm is not available (for example, someone has just uploaded a video and only mp4 streams are available -- including HD 1920x1080 mp4), the videos play fine, even with MSE enabled, and in this case, all resolutions are available, including 1080p.

When webm is present, all resolutions (including SD) pixelate in YouTube when MSE is enabled.  If I disable MSE, then all videos play fine in YouTube, whether they include webm streams or not.

However, webm test videos at https://www.webmfiles.org/demo-files/ play fine in all cases.

I am attaching a screenshot from the MiniBrowser that illustrates the pixelation.  The video will from time to time display clearly, then it resumes pixelation.

Steps to reproduce:
    1. Find a YouTube video that has webm/vp9 streams.  I use youtube-dl for this purpose.
    2. Enable MediaSource extensions in WebKit
    3. Open to the video from step 1.  It will be pixelated in all resolutions.

Expected behaviour:
    All videos should display without pixelation.

Environment:
    WebKit: 2.22.3
    GStreamer: 1.14.4 with plugins base, good, ugly, bad, and libav
    GPU: NVIDIA GeForce GT 610
    GL libraries provided by: NVIDIA driver 346.35
    OS: Solaris 11.3

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