Comment 2 for bug 719296

I tried out your video, and had no issues with it on 1.3. It played silky smooth both when I double click the file, and on the timeline. The underlying video editing framework has not changed (from 1.2.2 to 1.3.0), so this is very strange. I would be sure you are not zooming, panning, rotating, or any other effect which would "scale" the image, or something like that.

Also, you might try reverting to version 1.2.2 and verify that the exact same steps do not produce stuttering, etc... Once we learn more about this bug, we can update the status to 'confirmed'... if we can confirm it. =) Thanks!