Base Media Information Atoms

QuickTime Movie File Format Specification, May 1996

Base Media Information Atoms

The base media information atom (shown in Figure 0-25 ) stores the media information for media types, such as text, MPEG, time code, and music.

Media types that are derived from the base media handler may add other atoms within the base media information atom, as appropriate. At present, the only media type that defines any additional atoms is the time code media. See "Time Code Media Information Atom" for more information about time code media.

Figure 25 The layout of the base media information atom

The base media information atom contains the following data elements.

Size: A 32-bit integer that specifies the number of bytes in this base media information atom.
Type: A 32-bit integer that identifies the atom type; this field must be set to ' minf' .
Base media information header: The base media information header atom (a required atom), which is described in the next section.
Base media info: The base media info atom contains control information that describes the media.