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

Glossaryfile preview A thumbnail picture from a movie thatis displayed in the Open File dialog box. See alsothumbnail picture.fixed point A point that uses fixed-point numbersto represent its coordinates. QuickTime uses fixedpoints to provide greater display precision forgraphical and image data.fixed rectangle A rectangle that uses fixed pointsto represent its vertices. QuickTime uses fixedrectangles to provide greater display precision.Flash A vector-based graphics and animationtechnology. Flash data is exported as SWF files.flattening The process of copying all of the originaldata referred to by reference in QuickTime tracksinto a QuickTime movie file. This can also be calledresolving references. Flattening is used to bring inall of the data that may be referred to from multiplefiles after QuickTime editing is complete. It makes aQuickTime movie stand-alone—that is, it can beplayed on any system without requiring anyadditional QuickTime movie files or tracks, even ifthe original file referenced hundreds of files. Theflattening operation is essential if QuickTime moviesare to be used with CD-ROM discs.frame A single image in a sequence of images. Foruncompressed audio, one sample from each channel.For compressed audio, a compressed group ofsamples whose format is dependent on thecompressor.frame rate The rate at which a movie isdisplayed—that is, the number of frames per secondthat are actually being displayed. In QuickTime theframe rate at which a movie was recorded may bedifferent from the frame rate at which it is displayed.On very fast machines, the playback frame rate maybe faster than the record frame rate; on slowmachines, the playback frame rate may be slowerthan the record frame rate. Frame rates may befractional.free atom An atom of type 'free', which you caninclude in a QuickTime file as a placeholder forunused space.file type atom An atom of type 'ftyp', whichdefines which file specifications a file is compatiblewith.graphics mode The method by which twooverlapping images are blended together to producea composite image.graphics world A software environment in whicha movie track or set of images may be defined beforeimporting them into a movie.handler reference atom A QT atom of type 'hdlr'that specifies the media handler to be used tointerpret a media. See also QT atom, media, mediahandler.hint track A track in a streaming movie thatcontains information for a packetizer about the dataunits to stream. See also streaming.hot spot An area, typically in a VR presentation,that the user can click to invoke an action.hypertext Action media that contains a URL andtakes the user to a website.identity matrix A transformation matrix thatspecifies no change in the coordinates of the sourceimage. The resulting image corresponds exactly tothe source image. See also transformation matrix.image In sprite programming, one of a sprite’sproperties. See also sprite, PCM.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.438