[Bug 745502] New: qtdemux: seek fails intermittently with video pad unlinked

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745502

            Bug ID: 745502
           Summary: qtdemux: seek fails intermittently with video pad
                    unlinked
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: shaunakg at nvidia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 298380
  --> https://bugzilla.gnome.org/attachment.cgi?id=298380&action=edit
The compressed file contains the debug log and the mediainfo dump

Seeking operation with qtdemux in the pipeline fails intermittently with the
video pad left unlinked leading to the pipeline being stalled. 

The seek operation works fine when both the audio and video pads or just the
video pad is linked.

I extracted the aac audio and dumped it to a file. Seeking operation on the
extracted audio file also works properly.

Also tried with different sinks (fakesink, filesink) and different decoders
(faad, mad) and the issue is still reproduced.

This issue is not reproducible on 0.10.

I have attached debug logs for both cases when the seek is successful and when
the seek fails. The difference that I can make out is that the stream-start
event is not sent on the audio pad.

I have also attached the mediainfo dump of the test stream.

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