is there a ffdshow manual ?

[clickit]

i saw the other day a post with this script :

loadplugin("E:\Media\Plugins\smoothd.dll")
avisource("E:\house.avi")
ffdshow("spline-1")#resize to 1280*960 via spline algorithm
ffdshow("noise-1")#luma noise 19 chroma noise 2 with new noise algorithm
smoothd(3,4)#deblocking/denoising
ffdshow("noise-1")#luma noise 19 chroma noise 2 with new noise algorithm
ffdshow("spline-2")#resize to 480*352 via spline algorithm, to help with aliasing

and i wonder if there is a manual on how to use ffdshow commands with avisynth ?

thanks in advance