The MP4 box header depends on both whether the box is a "full" box
(with version and flags) and whether the box has an extra 64-bit size
field. The MP4 parser was only considering the version and flags, but
not whether the extra size field was present. We already correctly
parsed the 64-bit size field, but computed offsets for other fields
without considering this.
Groundwork for a fix for #2759
Change-Id: I48f16ef073a036954b6f7d25641ccf29828b02c8
Joey Parrish
edce1899f9