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Do videos like this prove the earth is round:

https://www.youtube.com/watch?v=hQf4m6rew7c

https://www.youtube.com/watch?v=FHtvDA0W34I

There are comments saying that they use a fish-eye lense, but the only thing that seems to be affected is the earths curvature and nothing else...

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Except those ARE both fairly extreme fisheye lenses, and you can tell whenever the horizon goes above the midline and the curvature inverts (see 22:10 on the MiG video).

Neither the MiG nor Baumgartner were high enough for the extreme curvature visible on these videos to be an accurate reflection of what you would have seen in their shoes.

I read things that say you should be able to tell that the horizon dips at each end when you're at 35,000 feet above average sea level, but I can't eyeball it there and tell there's bend. I can at 50,000 feet.

2 things:

Sailors could see the top of ships before the whole ship when using a decent telescope.

I saw the curvature of the earth when I flew to Paris in a Concorde many years ago.

Ah ok, thank you.

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