well, thanks for the explanation, Didée!
so it all seems to come down to that little letter. and as i look into the example script again, i actually see it
.
well, should've noticed it earlier...
anyway, it seems to work now.
unfortunately, since i installed avisynth 2.5.5, i do always get that message "...'avs_release_video_frame' could not be found in the library 'avisynth_c.dll'." upon starting virtualdub and/or loading a script.
i mean, it doesn't seem to be a fatal thing, but it's a little annoying to click it away all the time.
i looked into /system32 and renamed that dll, but then it is just complaining about this one being missing...
ok, it works, i am happy!
just previewed the script a little - seems to look really nice! now i will encode a snippet, to see how motion behaves.
thanks again, nanga.