kTweenDuration
An atom that specifies the duration of a tween operation.
Overview
When a QuickTime movie includes a tween track, the time units for the duration are those of the tween track. If a tween component is used outside of a movie, the application using the tween data determines how the duration value and values returned by the component 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 media sample that contains it.