Wednesday, June 11, 2008

Compression Artifacts & Pulldown

Chris Meyer | 06/11- 08:01 AM

A question about a ghost leads to discourses on 3:2 pulldown and the QuickTime codec dialog.

This started as a quick post about how to gain finer control over the compression settings in the QuickTime dialog. But before we can get there, we first need to talk talk about how 3:2 pulldown works. (Trust me; it all ties together; it was also a good little mystery.)

I recently gave a training session at a local studio, and at the end they were invited to trot out their Barney Stumpers (questions about why something went wrong, how something works, etc.). For one stumper, a user had some footage with 3:2 pulldown, and after pulldown was removed, he noticed that an after-image of the previous frame appeared in the next frame after an edit. Why?

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