How do you create this effect

[Cabrera]

1:32

http://www.youtube.com/watch?v=UBoSWz562Jc

 

[AndrewGentle]

Keyframed masks?

 

[Cabrera]

the bars moving

 

[Dingos8mybaby]

If you think they did it in FCP, maybe they used this plugin? It's called SplitScreen.

http://www.crumplepop.com/?page_id=19