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

Media Data Atom TypesSprite Track Media FormatAtom typekSpriteTrackPropertyOffscreenBitDepthkSpriteTrackPropertySampleFormatkSpriteTrackPropertyHasActionskSpriteTrackPropertyQTIdleEventsFrequencykSpriteTrackPropertyVisiblekSpriteTrackPropertyScaleSpritesToScaleWorldAtom ID111111Leaf data typeunsigned shortlongBooleanUInt32BooleanBooleanNote When pasting portions of two different tracks together, the Movie Toolbox checks to see thatall sprite track properties match. If, in fact, they do match, the paste results in a single sprite trackinstead of two.Sprite Track Media FormatNote Sprite media is deprecated in the QuickTime file format. The information that follows is intendedto document existing content containing sprite media and should not be used for new development.The sprite track media format is hierarchical and based on QT atoms and atom containers. A sprite track isdefined by one or more key frame samples, each followed by any number of override samples. A key framesample and its subsequent override samples define a scene in the sprite track. A key frame sample is a QT atomcontainer that contains atoms defining the sprites in the scene and their initial properties. The override samplesare other QT atom containers that contain atoms that modify sprite properties, thereby animating the spritesin the scene. In addition to defining properties for individual sprites, you can also define properties that applyto an entire sprite track.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.211