Apple Final Cut Pro 7 - Manual (Page 1776)

4 In the Properties window, select the main movie track (not the video or sound tracks).
5 Click Presentation, then choose an aperture mode from the “Conform aperture to” popup
menu.
Classic Aperture Mode
In this mode, content appears as it did in QuickTime 7 and earlier. The video track
dimensions are respected. For example, a DV NTSC track appears as 720 x 480.
Classic: no pixel aspect
ratio correction or
aperture cropping
Clean Aperture Mode
An image’s clean aperture is a region of video free from transition artifacts caused by the
encoding of the signal. This is the region of video that should be displayed.
Edge encoding artifacts Cropped edge
(in clean aperture mode)
1776 Chapter 106 Exporting Using QuickTime Conversion