However this mode is NOT recommended as it has some limitations, for example it doesn't allow to change the video frame size, so SVP's Video frame and Outer lighting functions won't work.
PotPlayer supports Avisynth and Vapoursynth directly, without the need for AVSF or ffdshow.
For the ffdshow just replace 'Avisynth Filter' with ffdshow raw video filter in the above steps.
