If a file is not written properly or is non-conforming, the file will either not play or become untouchable by other mpeg-4 utilities.ĪtomicParsley works by first scanning the file, looking for these atoms and how they are organized. mdat atoms carry the raw audio/visual stream & so have lots of content - typically the largest portion of the file. For example a moov atom is a parent atom with no content except other atoms. Just as a gold or carbon atom have particular characteristics, each atom name has specific characteristics. An atom is defined as being a very simple building block: It is comprised of discrete units called 'boxes' or 'atoms'. The MPEG-4 specification details the MPEG-4 container. On *nix platforms, input is in UTF-8 the native Windows port supports full UTF-16 input. All strings are converted internally to UTF-8, converting as necessary. All iTunes-style text metadata is always in UTF-8 3gp assets & copyright notices can be in set in UTF-8 or UTF-16. You can have for example 3 title tags, but 1 in english, 1 in spanish, 1 in undefined. 3gp assets and copyright notices support multiple tags, but they must differ in the language setting for that tag. With the exception of artwork, all iTunes-style tags support only 1 piece of metadata - you can't have for example 3 title tags. The first paragraph here sums the situation up well. Similarly, a 3gp 'location' asset is not available for an iTMS video file. Since there is nothing in the 3GPP2 specification regarding iTunes-style metadata, its use is prevented on such files.
It is based on this major file brand that AtomicParsley allows a style of metadata to be set. For example, an iTunes audio file typically lists 'M4A ' as its major file brand, while a 3GPP2. Each MPEG-4 file lists a "major file brand" that broadly says which specification the file adheres to. mov container (just more sane) & there are a number of similarites - as well as differences. The MPEG-4 container is based on Apple's Quicktime. uuid private user extension text & file embedding for MPEG-4 & derivative files.ISO copyright notices at movie & track level for MPEG-4 & derivative files.3gp-style assets (3GPP TS 26.444 version 6.4.0 Release 6 specification conforming) in 3GPP, 3GPP2, MobileMP4 & derivatives.AtomicParsley is a lightweight command line program for reading, parsing and setting metadata into MPEG-4 files supporting these styles of metadata:
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