[Bug 793463] New: avvidedec: gstlibav video decoder does not unmap the output frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793463

            Bug ID: 793463
           Summary: avvidedec: gstlibav video decoder does not unmap the
                    output frame
    Classification: Platform
           Product: GStreamer
           Version: 1.13.x
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vikram.fugro at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

gstlibav video decoder does not call unmap on the output frame, just before
finish_frame(). This leads to the video-frame buffer having more than 1
ref-count. As a result, (since it is now non-writable i.e ref-count > 1), there
is always an unnecessary frame-copy step executed just before the output of the
decoder (i.e before pushing it downstream)

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