[Bug 780410] New: qtdemux: distinguish TFDT with value 0 from no TFDT at all

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780410

            Bug ID: 780410
           Summary: qtdemux: distinguish TFDT with value 0 from no TFDT at
                    all
    Classification: Platform
           Product: GStreamer
           Version: 1.10.4
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: eocanha at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Commit https://github.com/GStreamer/gst-plugins-good/commit/1fc3d42f from bug
https://bugzilla.gnome.org/show_bug.cgi?id=754230 has caused a regression in
our use case (YouTube TV MSE Conformance Tests 2016, test 40.
AppendOutOfOrder).

It's an audio stream whose data is appended out of order (as per the test) in
these batches (ranges are in seconds): [10, 20] [0, 10] [30, 40] [20, 30]. All
the fragments have TFDT atoms, but the new condition added in the mentioned
commit is misinterpreting a legitimate "0" value in the TFDT atom as "no TFDT
atom at all".

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