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

Movie AtomsMedia AtomsNote “Using Sample Atoms ” (page 116) discusses how the video media handler locates samples ina video media.Video Media Information AtomsVideo media information atoms are the highest-level atoms in video media. These atoms contain a number ofother atoms that define specific characteristics of the video media data. Figure 2-24 (page 86) shows the layoutof a video media information atom.Figure 2-24The layout of a media information atom for videoVideo media information atomAtom sizeType = 'minf'Video media information atomHandler reference atomData information atomSample table atom'vmhd''hdlr''dinf''stbl'‡‡‡ Required atomThe video media information atom contains the following data elements.SizeA 32-bit integer that specifies the number of bytes in this video media information atom.TypeA 32-bit integer that identifies the atom type; this field must be set to 'minf'.Video media information atomSee “Video Media Information Header Atoms” (page 87).Handler reference atomSee “Handler Reference Atoms” (page 84).Data information atomSee “Data Information Atoms” (page 92).Sample table atomSee “Sample Table Atoms” (page 96).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.86