Hi gilou8, I've moved your post here from PM.
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Several members may be able to give you some helpful advice.
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On to the tech question...
It could be an issue with Scenalyzer corrupting the video. Consider trying WinDV instead, and then compare the results.
Let's see if the software is a variable. If so, great! If not, we'll move on to the next potential cause.
Get it here:
http://www.digitalfaq.com/forum/vide...-software.html
See if that helps. Report back either way (whether it works, or if it does not.)