[Bug 752442] New: gtksink: Display once back frame when caps changes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752442

            Bug ID: 752442
           Summary: gtksink: Display once back frame when caps changes
    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: nicolas.dufresne at collabora.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Both gtksink and gtkglsink displays a black frame when caps changes. The
problem is that set_caps() is not asynchonous as it should. It drops the
pending frame, without cancelling the redraw. That leads to a black frame being
shown. This drop of frame is systematic since set caps is called immediately
after the last show frame. I suggest to fix bug 752441 first, as this would
lead to yet more copy paste.

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