Thank you for your answer, but sadly it doesn’t seem to solve the problem. The resolution of the stills is high – 3264X2448. We did reduce the resolution using PhotoImpact, but this didn’t solve the problem.
I uploaded an example of the problem to youtube… it’s in very bad quality, but you get the idea. Notice how the green trees seem to “shake”.
https://www.youtube.com/watch?v=J3T8IRJ-6W4