Quicktime File Format (2012-08-14).pdf

MetadataMetadata Item List AtomFigure 3-2 (page 137) shows a sample layout for this atom.Figure 3-2A typical metadata item keys atomItem keys atom (type = ‘keys’)entry countEquals 4 inthis exampleKey 1 definition size namespace valueKey 2 definitionsize namespace valueKey 3 definitionsize namespace valueKey 4 definitionsize namespace valueFigure 3-3 (page 137) shows an example of a metadata item keys atom consisting of three keys: two from onekey namespace and a third from another key namespace.Figure 3-3An example of a metadata item keys atom‘keys’entry_count = 3key_size (uint32)key_namespace (uint32) key_value (uint8[ ])1 38 ‘mdta’ com.apple.quicktime.copyright2335 ‘mdta’ com.apple.quicktime.author12 ‘udta’ ©cpyMetadata Item List AtomThe metadata item list atom holds a list of actual metadata values that are present in the metadata atom. Themetadata items are formatted as a list of items. The metadata item list atom is of type ‘ilst’ and containsa number of metadata items, each of which is an atom.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.137