Resizing Clips
To change the duration of a clip, position the mouse over the left or the right end of the clip. Click and drag the end; this will change the length of the clip.
Resizing a texture clip has no effect on its playback speed. The video will be stopped before its end, or its playback will be looped in order to fit the length of time established by the size of the clip.
You cannot resize selections of multiple clips at once.