Yep I did manage it! Already since month
(There was a problem du a wrong merit setting as YV12 where strictly decoded by XVID in my cases.
I already used it once when doing a filtering-while-capturing in VirtualVCR as its a Dshow capt.appl.
But a problem occured in the version of october this year when using the non-generic build as there a bug happened when trying to "avisynth'ing" within ffdshow.
Now This should have been fixed AFAIK.
You should "try" to upgrade as many very interisting add-ons have been made since your release (which is a 2003 build if I do remember?!)
Now by using ffdshow filters DIRECTLY as avisynth commands, you can test ffdshows postprocessor as it gots a LOT more options, not mention all other filters in ffdshow ..... maybe an "optimal ff-V5" Script in the future