I've an extremely niche #video question.

I have a 360 / spherical camera. When I grab the videos from its SD card, they come out like this - fisheye format.

Is there an easy way to turn them into #EquiRectanguar format suitable for #photosphere viewing? I'm using Linux.

If I use the official camera app, it converts them. But the app doesn't work on modern Android phones!

Help, advice, and speculation all welcomed.