The Media Data Box contains the media data. In video tracks, this box would
contain video frames. A presentation may contain zero or more Media Data
Boxes. The actual media data follows the type field; its structure is
described by the metadata in the movie box.
There may be any number of these boxes in the file (including zero, if all
the media data is in other files). The metadata refers to media data by its
absolute offset within the file.
Fields inherited from class net.sourceforge.jaad.mp4.boxes.BoxImpl