What I am saying is that the clips are incorrectly encoded, if you step through the frames they do not proceed as a set of correctly sequenced frames.

The frames are all over the place, you have a frame, then a double of that frame, then another, then a missing frame, then we jump onto 2 or three frames later and so on . .

Let me explain it like this, you would normally have a sequence like this:

1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 . . . and so on.

But the clip appears to run something like this:

1 - 1 - 3 - 4 - 4 - 6 - 7 - 7 - 9 - 10 - 10 - 12 . . . and so on.

This is why the clips plays back with a jerky irregular motion. I suspect the source 23.98 fps footage has been edited in a 29.97 fps (or 30 fps) timeline and then re-exported at 23.98 fps (?)

Is there any chance you could simply upload the original source footage so we can have a look at the quality of the footage that the camera produces ?

Please !! :)

here you go : dpreview.com/news/0809/08090101nikond90samplegallery.asp

Cheers, seen that footage, not great.