The Quicktime Movie File Format is a published ( http://developer.apple.com/ techpubs/quicktime/qtdevdocs/PDF/QTFileFormat.pdf) file format for storing multimedia content for Quicktime presentation. Several players are available on many platforms.
The Quicktime file format uses a track model for organising the temporally data of a movie. A movie can contain one or more tracks -- a track is a time-ordered sequence of a media type. The media are addressed using an edit list which is a list of end-points of digital media clips or segments.
See handouts, Ch 14 in Multimedia Systems by J. Buford (Addison Wesley) and the online Apple documentation for further details.