A module containing a set of utilities for assembling an MPEG-4 track box.

The track box (trak atom) describes a single track of a presentation. This description includes information like its timescale, duration, volume, media-specific data (media handlers, sample descriptions) as well as a sample table, which allows media players to find and interpret track's data in the media data box.

For more information about the track box, refer to ISO/IEC 14496-12.