[Bug 734060] New: videoaggregator: Race when scrub forward seeking in PAUSED leading to no ASYNC_DONE on the bus

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734060
  GStreamer | gst-plugins-bad | git

           Summary: videoaggregator: Race when scrub forward seeking in
                    PAUSED leading to no ASYNC_DONE on the bus
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tsaunier at gnome.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Test reproducing the issue:
https://jenkins.arracacha.collabora.co.uk/view/pitivi/job/gst-validate-tests/798/testReport/junit/validate.file.glvideomixer.simple/scrub_forward_seeking/synchronized/history/

In the test we have the following pipeline running:

gst-validate-1.0  --set-scenario scrub_forward_seeking compositor
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.


The scrub forward seeking scenario actually seeks the pipeline in the PAUSED
state by step of 0.1 seconds

I could not actually reproduce that race here but it seems to exist and can
happen with compositor as well as glvideomixer, both using GstVideoAggregator
as a baseclass.

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