AtomicParsley is a lightweight command line
program for reading, parsing and setting metadata
into MPEG-4 files supporting these styles of
metadata:

* iTunes-style metadata into .mp4, .m4a,
.m4p, .m4v, .m4b files
* 3gp-style assets (3GPP TS 26.444 version
6.4.0 Release 6 specification conforming)
in 3GPP, 3GPP2, MobileMP4 and derivatives
* ISO copyright notices at movie and track
level for MPEG-4 and derivative files
* uuid private user extension text and file
embedding for MPEG-4 and derivative files

The MPEG-4 container is based on Apple's Quicktime
.mov container (just more sane) and there are a
number of similarites - as well as differences.

Each MPEG-4 file lists a "major file brand" that
broadly says which specification the file adheres
to. For example, an iTunes audio file typically
lists 'M4A ' as its major file brand, while a
3GPP2 .3g2 file has something like '3g2a'. It is
based on this major file brand that AtomicParsley
allows a style of metadata to be set.

Since there is nothing in the 3GPP2 specification
regarding iTunes-style metadata, its use is
prevented on such files. Similarly, a 3gp
'location' asset is not available for an iTMS
video file.