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Part 12 of JPEG 2000, ISO/IEC 15444-12, has a common text with Part 12 of the MPEG-4 standard, ISO/IEC 14496-12. It is a joint JPEG and MPEG initiative to create a base file format for future applications.

The format is a general format for timed sequences of media data. It uses the same underlying architecture as Apple's QuickTime file format and the JPEG 2000 file format.

The Motion JPEG 2000 file format, MJ2, originally defined in ISO/IEC 15444-3:2002 as a standalone document, has now been expressed by ISO/IEC 15444-3:2002/Amd 2:2003 in terms of the ISO Base format. The MPEG-4 file format, MP4, is another application of the ISO Base.

Part 12 became an International Standard (ISO/IEC 15444-12) in July 2003.