Use in points and out points to determine where and how edits are inserted on the record clip. In and out points also determine what part of a source clip is used when inserting or overwriting material.
For example, assume you have a 200-frame source clip, but are only interested in frames 50-125. By using these frames as your in points and out points, only the frames that lie between them are visible after making the edit. The remaining frames are still available as head and tail frames, which you can use to trim the edit or create a dissolve.
In points and out points appear both on the timebar and on the timeline. An in point appears as a white left square bracket and an out point appears as a white right square bracket.
The timeline positioner acts as an implicit in point when performing overwrite and insert edits. If there is no in or out point in the record clip, the positioner in the record clip is used as an implicit in point. The new material from the source clip is inserted at the frame where the positioner is located.
If there is no in point or out point in the source clip, the positioner in the source clip is used as an implicit in point. If there is an in point and/or an out point in the source clip, the positioner is ignored.
