Trimming Segments in the Timeline
You can trim a segment from either end, lengthening or shortening the segment frame-by-frame or by larger increments. You can also perform a double-sided trim, in which the combined duration of both segments remains the same.
After you trim a segment, the position indicator automatically moves to the new position in the sequence and the frame at that position is displayed in the viewer of the Media pane so you can see the exact frame to which the segment was trimmed.
You can only lengthen a segment to the maximum length of its original source media.
The following topics describe trimming segments: