btw, trodas links to a really old release of ffdshow (sept. 2002)... which does not work well with contents encoded with more recent builds of the xvid codec.
you may want to try a newer release of ffdshow [I've not had any trouble yet with the may 2003 release]
(or try xvid itself as pointed out by adicoto)
http://sourceforge.net/project/showf...ease_id=161224