[vintagedave]

That's quite an extraordinary effect. There's a point where enough pixels have been swapped that you can see the original, and it jumps out, and thereafter the image is quite surreal before eventually being 'tinted'.

(Also shows the video compression in the final frame well, because it doesn't match the first frame. Just found that interesting.)

[mg]

Thanks. Yes compression arteficts always become very visible. Especially in low-detail areas like the sky.

[iamleppert]

What is the algorithm you are using for replacement / swap?

[mg]

I have written up a description here:

https://www.instagram.com/marekgibney/reel/DDezhSisD4J/