The reason for the jump in numbering from 7 to 10 (X) was to indicate a similar break with the previous versions of the product that Mac OS X indicated.

and it is named in Annex D (informative) in MPEG-4 Part 12. A list of all registered extensions for ISO Base Media File Format is published on the official registration authority website This registration authority for code-points in 'MP4 Family' files is Apple Computer Inc. It in turn is used as the basis for other multimedia file formats (for example 3GP, Motion JPEG 2000). The MP4 file format was generalized into the ISO Base Media File Format ISO/IEC 14496-12:2004, which defines a general structure for time-based media files. In 2003, the first version of MP4 format was revised and replaced by MPEG-4 Part 14: MP4 file format (ISO/IEC 14496-14:2003). mp4) file format was published in 2001 as the revision of the MPEG-4 Part 1: Systems specification published in 1999 (ISO/IEC 14496-1:2001). The MPEG-4 file format specification was created on the basis of the QuickTime format specification published in 2001.

On February 11, 1998, the ISO approved the QuickTime file format as the basis of the MPEG‑4 file format.

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