Save frames of a video in a grid


first, im really new to p5.js / processing. I just got a new book "creative coding in web", their is an example which will save frames of a video in a grid. My problem is, i dont get how the time measurement works, for me it seems to be really buggy. Everytime i run the sketch the result looks different. (Here is the example

It would be nice if anyone could help me out.

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