[Bug 693993] New: [subtitleoverlay] deadlock with mp4 file during preroll

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=693993
  GStreamer | gst-plugins-base | 1.x

           Summary: [subtitleoverlay] deadlock with mp4 file during
                    preroll
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The following pipeline is stuck in preroll when using subtitleoverlay, the
video pad never unblocks:

gst-launch-1.0 souphttpsrc
location=http://absolut.zogzog.org/share/samples/mp4/Escargot.mp4 ! qtdemux
name=dmx \
   multiqueue name=mq \
   dmx.video_0 ! mq. mq. ! avdec_h264 ! videoconvert ! overlay.video_sink \
   dmx.subtitle_0 ! mq. mq. ! overlay.subtitle_sink \
   subtitleoverlay name=overlay wait-text=false ! videoconvert ! xvimagesink


The same pipeline works when using textoverlay directly:

gst-launch-1.0 souphttpsrc
location=http://absolut.zogzog.org/share/samples/mp4/Escargot.mp4 ! qtdemux
name=dmx \
   multiqueue name=mq \
   dmx.video_0 ! mq. mq. ! avdec_h264 ! videoconvert ! overlay.video_sink \
   dmx.subtitle_0 ! mq. mq. ! overlay.text_sink \
   textoverlay name=overlay wait-text=false ! videoconvert ! xvimagesink

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