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The video inpainting is interesting. My kids were watching old Spongebob episodes recently and the 4:3 aspect ratio was jarring to me. I thought it would be an interesting use case to in-paint the side borders to bring it back into 16:9 aspect, but I suppose it would need some careful fine-tuning with some kind of look-ahead for objects that enter frame from the sides.

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That actually sounds like a product somebody in the television and movie industry might buy.

Dynamic adjustment of fixed aspect ratio film imagery to non-native sizes without stretch or obvious distortion. Guess all the added edges accurately enough that audiences won't notice.

4:3 <-> 16:9 <-> 143:100 (IMAX) <-> 11:8 (Academy) <-> 3:2 (35mm) <-> 16:10 (tablets/desktops)

Make a new movie look like a classic b/w silent, then give it the correct frame.

Adapt any movie to smoothly work on IMAX displays.

Or make those darn new fangled vertical TikTok style videos watchable!

I recently saw someone do the opposite - Uncrop Bollywood movies into vertical format.

Can't you just process the video backwards?

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