[Bug 793643] New: vaapi: GL context sharing issue with WebKit

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793643

            Bug ID: 793643
           Summary: vaapi: GL context sharing issue with WebKit
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: philn at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

With gst 1.12.4 the shared GL display is correctly propagated from the video
sink towards downstream GL elements and the vaapidecodebin/postproc.

With gst master the propagation works as well but vaapipostproc performs an
extra context query that fails and a new (not shared) gldisplaywayland is
created and replaces the previous gldisplayegl (shared) display which gets
finalized..

I'll attach logs exposing the issue.

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