Thank you.
I used avisynth as a frameserver for virtualdub, but it didn't work for me. Frames were skipped or jumped back and forth, of a 2 minute movie only 30 seconds were shown in vdub, and many other glitches.
Any alternatives to avisynth, or at least a hint which filters I need, which program to use the script with, how to avoid the glitches I mentioned above?