I have a shot of a highway which lasts about 20 minutes at normal speed. I put 2 copies of it in the time line and sped one up real fast and left the other one normal speed. I added a crop to one and made it so one side of the highway was going super speed, and the other side was going normal speed. It looks sort of good, but there I am still able to see where the one video ends on the screen and where the other one begins. Its like a line going down the middle of the screen. Is there anyway I can soften it so it isn't so noticable?