Clip Composition
What is Composition?
'Clip Composition' allows you to control the Aspect Ratio, Cropping and Expansion of a video clip. Please note that this functionality is only available in Pro-HD

To change the composition of a clip, double click with the left mouse button on the clip to open the 'Clip Details' dialog window. Then select the 'Composition' tab as shown below:

You can also create an artificial zoom on a clip by using the 'Composition Expander'. The rate of expansion can be controlled independently in the horizontal and vertical direction. The centre of expansion can also be controlled.

The 'Video Crop Control' allows you to select a smaller portion of the video clip.