kTweenStartOffset
An atom that specifies a time offset from the start of the tween media sample to the start of the tween atom.
Overview
For a tween atom in a tween track of a QuickTime movie, specifies a time offset from the start of the tween 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 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 tween operation begins at the start of the tween media sample.