[Bug 752523] New: avdec_h264 crashes when using debug-mv=true option

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752523

            Bug ID: 752523
           Summary: avdec_h264 crashes when using debug-mv=true option
    Classification: Platform
           Product: GStreamer
           Version: 1.5.2
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mathieu_hinder12 at hotmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

FFmpeg/Libav can display motion vectors on top of h264 decoded video. The
avdec_h264 element has a property:

- 'debug-mv': Whether libav should print motion vectors on top of the image

Enabling this option crashes a pipeline.

When looking at how it's done in FFmpeg, it happens in the mpegvideo.c file in
the function ff_print_debug_info(), which wraps ff_print_debug_info2(), and
there the motion vectors are drawn.

In the gst-libav version of mpegvideo.c, ff_print_debug_info() doesn't do
anything except logging. ff_print_debug_info2() is absent.

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