The format specifies a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, or text. Each track either contains a digitally-encoded media stream or a data reference to the media stream located in another file. Tracks are maintained in a hierarchical data structureconsisting of objects called atoms. An atom can be a parent to other atoms or it can contain media or edit data, but it cannot do both. The ability to contain abstract data references for the media data, and the separation of the media data from the media offsets and the track edit lists means that QuickTime is particularly suited for editing, as it is capable of importing and editing in place. Other later-developed media container formats such as Microsoft's Advanced Systems Format or the Matroska and Ogg containers lack this abstraction, and require all media data to be rewritten after editing.
Relation to MP4
Because both the QuickTime and MP4 container formats can use the same MPEG-4 formats, they are mostly interchangeable in a QuickTime-only environment. MP4, being an international standard, has more support. This is especially true on hardware devices, such as the PlayStation Portable and various DVD players; on the software side, most DirectShow and Video for Windows codec packs include an MP4 parser, but not one for QTFF. In QuickTime Pro's MPEG-4 Export dialog, an option called "Passthrough" allows a clean export to MP4 without affecting the audio or video streams. One discrepancy ushered in by QuickTime 7 released on April 29 2005, is that the QuickTime file format supports multichannel audio.
Extensions
The International Organization for Standardization approved the QuickTime file format as the basis of the MPEG-4 file format. The MPEG-4 file format specification was created on the basis of the QuickTime format specification published in 2001. The MP4 file format was published in 2001 as the revision of the MPEG-4 Part 1: Systems specification published in 1999. In 2003, the first version of MP4 format was revised and replaced by MPEG-4 Part 14: MP4 file format. 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. It in turn is used as the basis for other multimedia file formats. 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 Inc. and it is named in Annex D in MPEG-4 Part 12.
