The MultimediaWiki reports, "Atoms are chunks of data in that comprise a QuickTime file. Specialists describe QuickTime atoms as the format's fundamental building blocks.
QuickTime also wraps still images (QuickTime Image Files), animations not recorded as video, virtual reality, etc., and these are not discussed at this site, with the exception of SWF_7 and SWF_8, the Flash SWF File Format (versions 7 and 8). This description is concerned with QuickTime as a video wrapper (generally with a synchronized audio stream), called "movie" files by Apple, and as a sound wrapper, especially as used by Apple's iTunes music service. File format that wraps video, audio, and other bitstreams.
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