ISO Base Media File Format

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File Format
Name ISO Base Media File Format
Ontology
LoCFDD fdd000079

ISO Base Media File Format (occasionally abbreviated BMFF) is a metaformat for "time-based" media formats (mainly audio and video). It is based on the more-general metaformat we're calling boxes/atoms format.

It is defined by Part 12 of the MPEG-4 standard, and also by Part 12 of the JPEG 2000 standard.

Files always have an "ftyp" box, which contains a list of "brands" that give information about the specific file format. See the boxes/atoms article for more about brands.

Much of the format was copied from QuickTime format.

Among the formats based on it are MJ2 and MP4.

Identification

Files use boxes/atoms format, and almost always have both an "ftyp" box and an "moov" box. However, for compatibility with certain older files, the "ftyp" can sometimes be omitted.

Specifications

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