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Tony. Can't help directly but this may be of some indirect help. I always get squashed images from my GstarEx video camera. It's not the camera's fault though. The camera outputs a 768 x 576 frame but the capture device in my laptop only generates a 720 x 576 frame. At first, in my ignorance, I assumed that I was losing some of the camera's output - 48 pixels from each line (i.e. 768 – 720). But it turned out that that was not the case. The full image width of 768 pixels was being recorded by the capture device but it was crammed into only 720 pixels. The result is that each frame is compressed horizontally (or, if you like, stretched vertically). My solution is to stack the avi frames normally and then resize the resulting stacked image from 720 x 576 back up to 768 x 576. This removes the distortion. Maybe your problem has a similar cause?
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