[Bug 775102] New: glvideomixer: validate: Playback with fast forward trick mode is very slowly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775102

            Bug ID: 775102
           Summary: glvideomixer: validate: Playback with fast forward
                    trick mode is very slowly
    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: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Validate tests: validate.file.glvideomixer.simple.fast_forward.synchronized
Result: HARD timeout, last more than 150 secs (this test should last ~14
seconds (which is the case with compositor))

Failure example:
https://ci.gstreamer.net/job/GStreamer-master-meson-validate/268/testReport/junit/validate.file.glvideomixer.simple/fast_forward/synchronized/

Pipeline:

GST_VALIDATE_SCENARIO=fast_forward GST_GL_XINITTHREADS=1 \
 gst-validate-1.0  glvideomixer sink_1::alpha=0.5 sink_1::xpos=50
sink_1::ypos=50 name=_mixer !  deinterlace ! videoconvert ! autovideosink
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.


I have not investigated but we can see that the pipeline plays very smoothly
with compositor but it is very jerky with glvideomixer.

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