kMovieMediaDataReference
A data reference type and a data reference.
Overview
The data reference type is stored as an OSType at the start of the atom. The data reference is stored following the data reference type. If the data reference type is URL and the data reference is for a movie on the Apple website, the contents of the atom would be url http://www.apple.com/foo.mov.
There may be more than one atom of this type. The first atom of this type should have an atom ID of 1. Additional data references should be numbered sequentially.