[Bug 786150] New: dashdemux: skip period with same start time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786150

            Bug ID: 786150
           Summary: dashdemux: skip period with same start time
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: siva.vedula at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

There is a redundant period present while using external mpd. Start time of an
external mpd period and start time of regular mpd period computed to same. Due
to this conflict, error is returned and "Invalid Manifest" error is thrown.

For example:
1. P1 period with start time 'x' and duration 60S in regular mpd,
2. next there is an external mpd period with two periods P2 and P3 of duration
each 60S,
3. after this there is a period P4 with start time of 'x+120' in regular mpd.

For this, P3 start time is computed to 'x+120' and it is same as P4 start time.
Due to same start time for two periods, in period start time validation check,
error occurred.
This is observed in the below mpd:

http://vm2.dashif.org/livesim-dev/periods_60/xlink_30/insertad_2/testpic_2s/Manifest.mpd

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