After watching the video I don't see what the problem is?
There is some slight clipping in each frame but nothing that is worth complaining about.
I probably just don't have as high standards as you do but if that's all your problem is I wouldn't worry about it.
and btw....I don't get the clipping but I have a:
Intel E8500 dual core
ATI HD4870
4gig RAM
windoze XP
Creative X-Fi audio
and some other blah blah......
what do you have?
make sure there are no programs running in the background when playing the game.
I would normally recommend you install the latest video drivers but if you have an ATI card I don't recommend that as I have found their latest drivers to be problematic.