Reference Manual

285 Working with Video
The Video Clip and the Final Clip of Music.
5. Now, we click on the video clip’s title bar (to deselect everything else), then drag the video
clip’s left edge to the left as far as possible to reveal the pre-roll again.
The Video Clip with Pre-Roll Restored.
The Export Audio/Video command, by default, creates sample files as long as the Arrangement
selection; as the video clip is still selected, the exported sample file will have the exact same
duration as the original movie file, including the pre-roll.