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

Movie AtomsTrack AtomsPrint to Video (Full Screen Mode)A movie atom’s user data atom may contain a print to video atom ('ptv '). Note that the fourth character isan ASCII blank (0x20). If a print to video atom is present, QuickTime plays the movie in full-screen mode, withno window and no visible controller. Any portion of the screen not occupied by the movie is cleared to black.The user must press the Esc (Escape) key to exit full-screen mode.This atom is often added and removed transiently to control the display mode of a movie for a singlepresentation, but it can also be stored as part of the permanent movie file.The print to video atom’s payload data consists of the following.Display sizeA 16-bit little-endian integer indicating the display size for the movie: 0 indicates that the movie shouldbe played at its normal size; 1 indicates that the movie should be played at double size; 2 indicates thatthe movie should be played at half size; 3 indicates that the movie should be scaled to fill the screen; 4indicates that the movie should be played at its current size (this last value is normally used when theprint to video atom is inserted transiently and the movie has been temporarily resized).Reserved1A 16-bit integer whose value should be 0.Reserved2A 16-bit integer whose value should be 0.Slide showAn 8-bit Boolean whose value is 1 for a slide show. In slide show mode, the movie advances one frameeach time the Right Arrow key is pressed. Audio is muted.Play on openAn 8-bit Boolean whose value is normally 1, indicating that the movie should play when opened. Sincethere is no visible controller in full-screen mode, applications should always set this field to 1 to preventuser confusion.Track AtomsTrack atoms define a single track of a movie. A movie may consist of one or more tracks. Each track isindependent of the other tracks in the movie and carries its own temporal and spatial information. Each trackatom contains its associated media atom.Tracks are used specifically for the following purposes:●To contain media data references and descriptions (media tracks).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.54