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FILE EXCHANGE FORMATS

AAF is an industry-driven, cross-platform, file format that allows the interchange of data between multimedia authoring tools. AAF can be used to interchange essence data and metadata. Essence data consists of picture, sound and other forms of data that can be directly perceived. Metadata is data that describes essence data, performs some operations on essence data, or provides supplementary information about the essence data. For example, digitized sound data is essence data. However, the data that describes its format, specifies its duration and gives it a descriptive name, is metadata. Much of the creative effort that goes into a multimedia programme is represented by metadata. How one section transitions into another ... how special effects modify the data we perceive ... and how all the different kinds of primary data are related to each other (such as synchronizing the picture and sound) ... are all represented as metadata. AAF provides a way to interchange this rich set of metadata. AAF is being developed and promoted by the AAF Association [1].