SLIDE 23 Audiovisual Compression: from Basics to Systems, Fernando Pereira
About the MPEG File Formats About the MPEG File Formats About the MPEG File Formats
- The family of the storage file formats is based in the concept of box-structured
- files. A box-structured file consists of a series of boxes (sometimes called atoms),
which have a size and a type. The type field is usually four printable characters.
- Box structured files are used in a number of applications, and it is possible to form
‘multi-purpose’ files which contain the boxes required by more than one
- specification. Examples include the ISO Base File Format family and the JPEG
2000 file format family, which for the most part is a still-image file format.
- The ISO Base Media File Format additionally contains structural and media data
information for timed presentations of media data such as audio, video, etc. This structure is intentionally general, so that by structuring files in different ways the same base specification can be used for files for
- capture and local playback;
- exchange and download, including incremental download and play;
- editing, composition, and lay-up;
- streaming from streaming servers;
- more specialized uses include the use for the storage of a partial or complete MPEG-4
scene and associated object descriptions like in the MP4 file format.
