[Bug 746347] New: dashdemux: set default @startNumber and also avoid wrong overwrite

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746347

            Bug ID: 746347
           Summary: dashdemux: set default @startNumber and also avoid
                    wrong overwrite
    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: xixi10111011 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

It's related to commit[793b4bca93530a5e30b5ba8ea02983cbd11532db].
This commit fixed the default @startNumber to 1 as spec requires. 

However, it will overwrite "parent"'s @startNumber.

Consider this scenario: AdaptationSet has SegmentTemplate with @startNumber to
0, and Representation has SegmentTemplate with @startNumber missing.
The @startNumber of the Representation should be inherited from AdaptationSet.
But that git commit will set it to 1, overwriting an inherited value.

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