Apple Developer Legacy Content

Legacy content covers technologies, features, APIs, and programming techniques which are no longer supported or have been superseded.Apple Developer Legacy Content

Retired Documents Library

The Retired Documents Library contains documents that are not applicable for current product development. Some of these documents describe older programming techniques that are no longer recommended. Other documents describe older features, interfaces, and programming techniques that are no longer supported. This information is available to help you maintain and update older code bases.
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Classic Version of the QuickTime File Format Specification

This is the document on which the original MP4 File Format Specification was based.
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