[Bug 787538] New: matroskademux: infinite loop when seeking backward

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787538

            Bug ID: 787538
           Summary: matroskademux: infinite loop when seeking backward
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: julien.isorce at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

sample:
https://drive.google.com/file/d/0Bzat_iFKrgCWZm96Z0dvNnFva1U/view?usp=sharing

Steps: 
1) gst-launch-1.0 filesrc location=trailer.mkv ! matroskademux ! vp8dec !
navseek ! xvimagesink
2) Wait a few seconds
3) Press right arrow to do one seek forward
4) Press left arrow to do one seek backward

(It also happens if you skip either step 2 or 3)

gst_matroska_demux_search_pos:<matroskademux0> overshot target
gst_matroska_demux_flush:<matroskademux0> skipping 12 bytes

It loops here:

https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/gst/matroska/matroska-demux.c#n1865

Triggered by:
https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/gst/matroska/matroska-demux.c#n1963

I have tried on a few mkv samples and it happens only with the one pointed
above.

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