Timeline and transport controls
The following elements appear below the Timeline. They control video placement, playback and Timeline display.
Media viewing area View your video content in this area.
Timeline View the locations of markers, playback, thumbnails, scripting commands, leading and trailing videos, and edit points.
Timeline viewing buttons Use these controls to quickly zoom in or out of the Timeline and to view edited segments.
Add Source at Start button Click this button to add media to the beginning of the current clip.
Playback controls Monitor duration and control playhead location.
Editing buttons Use these buttons to create and remove edit points and remove clipped segments from the Timeline.
Add Source at End button Click this button to add media to the end of the current clip.