mp4标准文档ISO/IEC
14496-14; ISO/IEC
14496-12;
Part 14: MP4 file format
Introduction
0.1 Derivation
This specification defines MP4 as an instance of the ISO Media File format [ISO/IEC 14496-12 and ISO/IEC
15444-12].
The general nature of the ISO Media File format is fully exercised by MP4. MPEG-4 presentations can be
highly dynamic, and there is an infrastructure — the Object Descriptor Framework —, which serves to manage
the objects and streams in a presentation. An Initial Object Descriptor serves as the starting point for this
framework. In the usage modes documented in the ISO Media File, an Initial Object Descriptor would normally
be present, as shown in the following diagrams.
