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Aperture changes in Compressor 3.5

Have you noticed that movies compressed with Compressor 3.5 have a slightly different frame size when viewed in QuickTime Player?

Compressor 3.5 gives all QuickTime movies a Clean aperture by default (previous versions of Compressor set the aperture to None). This means that, although the actual frame size of the movie hasn't changed, when playing back, QuickTime scales and crops the movie to account for the non-square pixel aspect ratio of various video formats such as DV.

This has confused a lot of people because videos encoded with Compressor 3.5 are displayed differently to those encoded with Compressor 3.0. Although it is easy enough to change this within QuickTime Player, it needs to be done on a per-movie basis.

Luckily, Apple included an option in Compressor 3.5.2 (in the Pro Applications 2010-01 update) to switch this off. Just upgrade to Compressor 3.5.2 and deselect Add clean aperture information in the Encoder tab.