Update:   The reason why a seam is there was because the seam is in between tow pixels and anti-aliasing was at work. It will look much better on higher export resolution. The picture shown here was just a screen shot of a low res preview.   We do need anti-alias otherwise the position effect will look horrible when it's animated.   So to solve this problem, we will: Add a new effect which applies offset and automatically wrapping the video around the frame. Add an option to disable ant