Inside Macintosh: QuickTime Reference
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QuickTime 4.1 and the Sound Manager introduce support for the playback of variable bitrate (VBR) audio. Prior to this release, QuickTime only supported constant bitrate (CBR) audio. However, a number of modern audio compression formats -- such as MP3 -- either support or require VBR encoding. This is provided in the current QuickTime 4.1 release.
Inside Macintosh: QuickTime Reference
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