[Bug 736177] New: [REGRESSION] Negotiation fails between a timeoverlay and videomixer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736177
  GStreamer | gst-plugins-base | git

           Summary: [REGRESSION]  Negotiation fails between a timeoverlay
                    and videomixer
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tsaunier at gnome.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


As we can see here:
https://jenkins.arracacha.collabora.co.uk/job/gst-validate-tests/898/testReport/
tests that have a timeoverlay and a videomixer (compositor or old school
videomixer) fail to negotiate.

Reproduction:

gst-launch compositor sink_1::alpha=0.5 sink_1::xpos=50 sink_1::ypos=50
name=_mixer !  deinterlace ! videoconvert ! 'fakesink' videotestsrc
pattern=snow timestamp-offset=3000000000 !
'video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1' ! 
timeoverlay ! _mixer.

or

gst-launch videomixer sink_1::alpha=0.5 sink_1::xpos=50 sink_1::ypos=50
name=_mixer !  deinterlace ! videoconvert ! 'fakesink' videotestsrc
pattern=snow timestamp-offset=3000000000 !
'video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1' ! 
timeoverlay ! _mixer.


The culpright commit is:

commit 76ce11299411b412702d3fab34b7f152dc211156
Author: Arnaud Vrac <avrac at freebox.fr>
Date:   Thu Sep 4 15:06:31 2014 +0200

    basetextoverlay: schedule reconfigure on source pad when negotiation fails

    The source pad might be flushing while negotiating, resulting in
    set_caps or the ALLOCATION query failing. In this case set the
    reconfigure flag on the source pad so that negotiation is retried on the
    next buffer.

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