[Bug 753442] New: matroskademux: may get stuck when demuxing forced pgs subtitles

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753442

            Bug ID: 753442
           Summary: matroskademux: may get stuck when demuxing forced pgs
                    subtitles
    Classification: Platform
           Product: GStreamer
           Version: 0.10.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fraxinas at opendreambox.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

with this little modification:
-  subcaps = gst_caps_from_string ("text/x-pango-markup; text/plain");
+  subcaps = gst_caps_from_string ("text/x-pango-markup; text/plain;
subpicture/x-pgs");
the playbin-text.c example can be used as a testcase for this issue.

after the nth (in my case 6th) subtitle, playback stalls:

** Message: received a subtitle at position 0:19:31.755000000, running_time
0:19:31.756610000
00000000 (0x7f61c956d400): 16 00 0b 07 80 04 38 10 00 05 00 00 00 00 17 00 
......8.........
00000010 (0x7f61c956d410): 0a 01 00 03 50 03 63 00 e3 00 32 80 00 00       
....P.c...2...  
^C

* 1    Thread 0x7f61d5691700 (LWP 5202) "playbin-text" 0x00007f61d3d244ed in
poll () from /usr/lib/libc.so.6
(gdb) bt full
#0  0x00007f61d3d244ed in poll () from /usr/lib/libc.so.6
No symbol table info available.
#1  0x00007f61d48b8c7c in ?? () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#2  0x00007f61d48b9002 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#3  0x0000000000401263 in main (argc=2, argv=0x7ffc65f98d58) at
playbin-text.c:168
        app = 0x601ed0 <s_app>
        bus = 0x180bb60
        subcaps = <optimized out>
        __func__ = "main"


testfile available at http://dreambox.guru/test_stuck.mkv.xz

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