This specification defines MP4 as an instance of the ISO Media File format [ISO/IEC 14496-12 and ISO/IEC15444-12].The general nature of the ISO Media File format is fully exercised by MP4. MPEG-4 presentations can behighly dynamic, and there is an infrastructure — the Object Des criptor Framework —, which serves to managethe objects and streams in a presentation. An Initial Object Des criptor serves as the starting point for thisframework. In the usage modes documented in the ISO Media File, an Initial Object Des criptor would normallybe present, as shown in the following diagrams.
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