[Bug 753196] New: aggregator: seek_forward.synchronized takes too long

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753196

            Bug ID: 753196
           Summary: aggregator: seek_forward.synchronized takes too long
    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: ---

Basically, seek freeze for several seconds in presence of compositor or
glvideomixer. This is a regression I believe. Reverting the patch the removes
the clipping didn't help.

To reproduce:
time GST_GL_XINITTHREADS=1 DISPLAY=:0 GST_VALIDATE_SCENARIO=seek_forward
gst-validate-1.0  compositor sink_1::alpha=0.5 sink_1::xpos=50 sink_1::ypos=50
name=_mixer !  deinterlace ! videoconvert ! xvimagesink videotestsrc
pattern=snow timestamp-offset=3000000000 !
'video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1' ! 
timeoverlay ! _mixer. videotestsrc pattern=smpte !
'video/x-raw,format=AYUV,width=800,height=600,framerate=(fraction)10/1' !
timeoverlay ! _mixer.

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