A module containing a function for assembling an MPEG-4 media data box.

The media data box (mdat atom) is a top-level box that contains actual media data (e.g. encoded video frames or audio samples). The data is logically divided into so called "chunks" that consist of "samples". There are no assumptions made about chunks arrangement or sizes in the MPEG-4 specification and chunks belonging to different tracks can (and should) be interleaved.

For more information about media data box, refer to ISO/IEC 14496-12.