QuickTime 4 Reference

Compressed Movie Resources

Your software can read movie files that contain compressed movie resources. Compressing a movie resource can reduce the size of the resource by as much as 50%.

Applications or other software do not have to be modified to use compressed movie resources. They must, however, use QuickTime 3 or later; earlier versions return an error when attempting to open movie files that contain compressed movie resources.

Compressing Movie Resources When Flattening