[Bug 774809] New: glimagesink regression: does not render video since using libxcb

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774809

            Bug ID: 774809
           Summary: glimagesink regression: does not render video since
                    using libxcb
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mnauw at users.sourceforge.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 340468
  --> https://bugzilla.gnome.org/attachment.cgi?id=340468&action=edit
gl: x11 display glx workaround

More precisely, when running (gst-launch-1.0) the example pipeline videotestsrc
! glimagesink, then a window is created and shown, but it remains as an outline
and no content is ever filled (so whatever is behind the window remains
visible).

This happens as of commit 4f6c226bd24ae3ef66bd8f4c17b001444c9b0bf1 (using
libxcb in gl/x11), it rendered ok before that.  Some additional observations;
forcing GST_GL_PLATFORM=egl renders video fine (problem occurs with
GST_GL_PLATFORM=glx).  Also, upon applying the attached patch, the video also
renders fine with GST_GL_PLATFORM=glx.  It is not really a fix though, as it
knocks out the event handling.

All that is rather puzzling, possibly somehow system-specific and might be
dismissed as "lower level problems", but still if someone has additional
insight (and solution?) ...

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