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

Media Data Atom TypesTween MediakTweenStartOffsetFor a tween atom in a tween track of a QuickTime movie, specifies a time offset from the start of thetween media sample to the start of the tween atom. The time units are the units used for the tween track.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenStartOffset atom. The ID of this atom is always1. The index of this atom is always 1.This atom is a leaf atom. The data type of its data is TimeValue.This atom is optional. If it is not included, the tween operation begins at the start of the tween mediasample.kTweenDurationSpecifies the duration of a tween operation. When a QuickTime movie includes a tween track, the timeunits for the duration are those of the tween track. If a tween component is used outside of a movie, theapplication using the tween data determines how the duration value and values returned by thecomponent are interpreted.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenDuration atom. The ID of this atom is always 1.The index of this atom is always 1.This atom is a leaf atom. The data type of its data is TimeValue.This atom is optional. If it is not included, the duration of the tween operation is the duration of the mediasample that contains it.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.240