I have been using around 2010 avisynth. The premise seems similar https://sourceforge.net/projects/avisynth2/files/AviSynth%202.6/AviSynth%202.6.0/ https://sou

I have been using around 2010 avisynth. The premise seems similar https://sourceforge.net/projects/avisynth2/files/AviSynth%202.6/AviSynth%202.6.0/ https://sourceforge.net/projects/avisynth2/files/AviSynth%20... http://www.avisynth.org/ http://www.avisynth.org/ Last update seems to be from 2015 though.