[Bug 744839] New: gl: Flickering when libav direct rendering doing playbin playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744839

            Bug ID: 744839
           Summary: gl: Flickering when libav direct rendering doing
                    playbin playback
    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: ---

When playing inside playbin, we often get flickering when libav direct
rendering. This often starts when seeking, and is always visible on OSX.

gst-launch-1.0 playbin uri=...  video-sink="glimagesink"

One thing to notice is that forcing 1 more buffer in the pipeline fixes the
flickering.

gst-launch-1.0 playbin uri=...  video-sink="queue min-threshold-buffer=1 !
glimagesink"

This is a regression from previous version where direct rendering
(VideoAlignement) was not supported. Even though, not doing direct rendering is
equivalent to this extra buffer case.

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