[Bug 664892] New: [playbin2] subtitle stream switching doesn't work right

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=664892
  GStreamer | gst-plugins-base | git

           Summary: [playbin2] subtitle stream switching doesn't work
                    right
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Consider the following clip:

http://samples.mplayerhq.hu/Matroska/matrix/Matrix.Reloaded.Trailer-640x346-XviD-1.0beta2-HE_AAC_subtitled.mkv

It should start up with Arabic subtitles. Switch to French and do a short seek
back (to flush).

Expected result: from now on we should see French subs to go with the text:

Actual result: the french text is prefixed by subtitle format junk (looks like
SSA/ASS formatting).

The arabic subs seem to be pango markup while the others are application/x-ssa,
so it looks like something goes wrong with the parser switching or routing.

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