[Bug 760774] New: qtdemux: fix framerate calculation for fragmented format

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760774

            Bug ID: 760774
           Summary: qtdemux: fix framerate calculation for fragmented
                    format
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sh.yang at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

qtdemux calculates framerate using duration and the number of sample. In case
of fragmented mp4 format, however, the number of sample can be figure out after
parsing every moof box. Because qtdemux does not parse every moof in
QTDEMUX_STATE_HEADER state, it cause incorrect framerate calculation. To solve
this, both duration and the number of sample in the first moof can derive
correct framerate.

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