Windows 7, quad core, 16GB.

I am using Windows Movie Maker 2012 to make a video of several time lapse avi's created in VirtualDub from a string of jpegs taken with a fixed camera.  The avi files are steady as a rock.

When I preview the movie in the preview pane, it looks great.  After creating it as a wmv file, and playing it in Windows media player, the video shakes and shows obvious cropping on the edges.  It's as if it was "de-shaking" a shake free video!

Can anyone help?

Size of avi files, 1280 x 960, 30 fps.  Output size on wmv file, 1280 x 960. 

Help?