http://www.apple.com/quicktime/preview/quicktime6/
Quelques points importants:
MPEG-4 File Format (.mp4)
MPEG-4 Video
AAC Audio
QuickTime 6 also includes a new DVC Pro PAL video codec, support for Macromedia Flash 5, a new JPEG 2000 still image codec for Mac OS X, enhanced AppleScript support, and a host of new developer application programming interfaces (APIs).