[Bug 673888] New: Unable to resume playback after an error occurred during gapless playback.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=673888
  GStreamer | gst-plugins-base | 0.10.34

           Summary: Unable to resume playback after an error occurred
                    during gapless playback.
    Classification: Platform
           Product: GStreamer
           Version: 0.10.34
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lev.zelenskiy at nokia.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=211811)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=211811)
Full log, sample python script, and media files to reproduce the problem.

I'm using playbin2 and about-to-finish signal to implement gapless playback.
It works well with valid sound files.
However after it encounters invalid media file it's impossible to resume
playback with playbin2. 

I'm trying to set state to NULL, set URL to a valid media file, and then set
state to PLAYING, but it doesn't work and I'm getting an assert message in the
log (full log is attached):
CRITICAL **: deactivate_group: assertion `group->active' failed

I have attached a python script and test media files to reproduce the issue.

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