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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from xixi <xixi10111011 at gmail.com> ---
Created attachment 299600
  --> https://bugzilla.gnome.org/attachment.cgi?id=299600&action=edit
set default startNumber and also avoid wrong  overwrite

a candidate patch is attached.

It will set default @startNumber to 1, if @startNumber is missing at all level.
Also, it will avoid incorrect overwriting inherited value.

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