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

Media Data Atom TypesQuickTime uses atoms of different types to store different types of media data—video media atoms for videodata, sound media atoms for audio data, and so on. This chapter discusses in detail each of these differentmedia data atom types.If you are a QuickTime application or tool developer, you’ll want to read this chapter in order to understandthe fundamentals of how QuickTime uses atoms for storage of different media data. For the latest updates andpostings, be sure to see Apple's QuickTime developer website.This chapter is divided into the following major sections:●●●●●●●●●●●●●“Video Media” (page 155) describes video media, which is used to store compressed and uncompressedimage data in QuickTime movies.“Sound Media” (page 176) discusses sound media used to store compressed and uncompressed audio datain QuickTime movies.“Timecode Media” (page 189) describes time code media used to store time code data in QuickTime movies.“Text Media” (page 193) discusses text media used to store text data in QuickTime movies.“Closed Captioning Media” (page 198) discusses text media used to store CEA-608 closed captioning datain QuickTime movies.“Subtitle Media” (page 199) discusses tx3g text media used to store subtitle data in QuickTime movies.“Music Media” (page 206) discusses music media used to store note-based audio data, such as MIDI data,in QuickTime movies.“MPEG-1 Media” (page 207) discusses MPEG-1 media used to store MPEG-1 video and MPEG-1 multiplexedaudio/video streams in QuickTime movies.“Sprite Media” (page 208) discusses sprite media used to store character-based animation data in QuickTimemovies.“Flash Media” (page 234) is deprecated; included only for legacy.“Tween Media” (page 235) discusses tween media used to store pairs of values to be interpolated betweenin QuickTime movies.“Modifier Tracks” (page 247) discusses the capabilities of modifier tracks.“Track References” (page 248) describes a feature of QuickTime that allows you to relate a movie’s tracksto one another.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.154