Comparing 2 videos using Avisynth

Can some of you Avisynth experts help me with this one?

I started a youtube channel where I try to post comparison videos of the classic Star Trek episodes, https://www.youtube.com/channel/UCYVO_FV66VctfXLf9ClmrEg .

I have an avisynth script prepared which stacks the 2 videos side by side, but I have to do a manual comparison of both videos. Because it's manual work, it takes a lot of time and there is a BIG chance I will miss some of the changes. Is there a way how to do this in Avisynth?

I thought that I could maybe do something with overlays or something similar ....

What I am trying to achieve is a video, which will FOR EXAMPLE be black when the two videos are identical, and FOR EXAMPLE be white when there is ANY change on that frame.

In other words, I want to know immediately if the frame is identical in both versions or if there are any differences (the black and white frames are just examples, I don't care HOW will I get the information). Or maybe is there a chance to write a LOG FILE from Avisynth? You know, a file which would contain just the numbers of the frames which are different?

Could somebody help me with this? Thanks a lot

Interesting, I'll try it and let you know if it's helpful :)

Hm, interesting result, now to combine it with example 6 from here : http://avisynth.nl/index.php/Script_examples ... and it could get really good :)