I discovered ArKaos VJ. It's a very exciting software. Try it and you'll understand: http://arkaos.net/software/vj_download.php
There is a demo movie there: http://www.arkaos.net/software/vjd_tutorial.php
 
 

I'm a bit affraid.
Sur you know this is a french forum. The language required here is French.
En plus tu connais le français, en plus t'as déjà posté ça ailleurs...