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

Movie AtomsTrack AtomsFigure 2-10 (page 64) shows the layout of the track clean aperture dimensions atom.Figure 2-10The layout of a track clean aperture dimensions atomTrack Clean ApertureDimensions atomAtom sizeType = 'clef'VersionFlagsBytes4413Width 4Height 4SizeA 32-bit integer that specifies the number of bytes in the track aperture mode dimensions atom.TypeA 32-bit integer that identifies the atom type; this field must be set to ‘clef’.VersionA 1-byte specification of the version of this atom.FlagsThree bytes that are reserved for the atom flags.WidthA 32-bit fixed-point number that specifies the width of the track clean aperture in pixels.HeightA 32-bit fixed-point number that specifies the height of the track clean aperture in pixels.Track Production Aperture Dimensions AtomThis atom carries the pixel dimensions of the track’s production aperture. The type of the track productionaperture dimensions atom is ‘prof’.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.64