You've reached the page for developers who need to look at the:
Classic Version of the QuickTime File Format Specification (PDF, 5.3MB)
This is the document on which the original MP4 File Format Specification was based. The current MP4 specification can be found on the ISO Home Page. Simply enter the Standard Number in the Search Field: 14496-12, 14 and 15. This will take you to the specification.
You can also read the current version of the QuickTime File Format Specification.
Important: Usage of some of these file formats may be subject to license. For more information about licensing the QuickTime File Format, contact:
Software Licensing Department
12545 Riata Vista Circle
MS 198 3-SW
Austin, TX 78727
Email Address: firstname.lastname@example.org