How can I edit out the flicker from a projector from existing video footage? I recently filmed some content of a thin line of a projected image. The video footage is flickering a little and I am wondering if there's any solution to fix the footage once it's been filmed. I have tried to speed up and slow down the footage and it doesn't seem to change it. Is there any way of editing it out on imovie? Thanks!
tomh's advice to double stack the video layer, reduce opacity by 50% and advance a frame is a great starting point and certainly works well on fluorescent light flicker.

I've just had the same problem with a single chip DLP projector image in shot with the banding looping over about 5 frames. Working in Premiere Pro, I layered the video 3 times, cropped each layer to the projection screen area, reduced each layer to 25% opacity and advanced each layer 1 frame on from the last. I also reduced the brightness on the base layer by 100% (referring to Lumetri Scopes and using my eye to avoid blowing out the slide image). It's a very satisfactory result.

Caveat: If anything crosses the projected image is will look like it has a strobe effect and any animations, video or transitions will have this also, however for a set of static slides you should be fine.

I got a bit carried away and made an example video...

Hope this helps you or anyone else using a search engine to love their quirky issues like i did to find the original post.