DVCPROHD uses non-square pixels, so when you pull the stills they always look squished. So for example 720p LOOKS like 1280x720 but it's actually 960x720 stretched. You need to modify them in Photoshop by setting the image size (with 'maintain proportions' unchecked) and changing the width to 1280. I've even set up a Photoshop Action so that I can just batch process all my stills at once.
JK
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SCQT! Self-contained QuickTime ? pass it on!