[Bug 750804] dashdemux: incorrectly calculates presentationTimeOffset if the value is larger than 2^32

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750804

--- Comment #1 from A Ashley <bugzilla at ashley-family.net> ---
Created attachment 305087
  --> https://bugzilla.gnome.org/attachment.cgi?id=305087&action=edit
dashdemux: fix error calculating large presentation time offset

If the presentationTimeOffset attribute of a DASH manifest contains a value
that is larger than 2^32, gstmpdparser incorrectly calculates the stream's
presentation time offset. This is due to two bugs:

1: Using gst_mpdparser_get_xml_prop_unsigned_integer rather than
   gst_mpdparser_get_xml_prop_unsigned_integer_64 to parse the
   attribute

2: gst_mpd_client_setup_representation multiplies the value by
   GST_SECOND and then divides by timescale, causing 64 bit overflow

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