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

Movie AtomsOverview of Movie AtomsSelection timeThe time value for the start time of the current selection.Selection durationThe duration of the current selection in movie time scale units.Current timeThe time value for current time position within the movie.Next track IDA 32-bit integer that indicates a value to use for the track ID number of the next track added to this movie.Note that 0 is not a valid track ID value.Note The creation and modification date should be set using coordinated universal time (UTC). Inprior versions of the QuickTime file format, this was not specified, and these fields were commonlyset to local time for the time zone where the movie was created.Color Table AtomsColor table atoms define a list of preferred colors for displaying the movie on devices that support only 256colors. The list may contain up to 256 colors. These optional atoms have a type value of 'ctab'. The colortable atom contains a Macintosh color table data structure.Figure 2-4 (page 46) shows the layout of the color table atom.Figure 2-4The layout of a color table atomColor table atomAtom sizeType = 'ctab'Color table seedColor table flagsColor table sizeColor arrayBytes44422nThe color table atom contains the following data elements.SizeA 32-bit integer that specifies the number of bytes in this color table atom.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.46