My encode result is a green messed up video

[Selur]

c. I assume you mean in the Filtering tab right? When you change Support > Avisynth (default was Vapoursynth) and then I click Avisynth Preview. A new window opens up, and it says Preparing Environment for --Input. But then nothing else occurs. When I try to move the blue thing or press forward etc.. the entire window disappears.

which means that something went wrong, usually the log should show where the problem was.

Cu Selur