I have a 360 video (Filmed using Garmin Virb).
I tried to extract some frames from it, to do some processing, but apparently, the aspect ratio is 16:9.
I expected it to be 2:1, to match a normal equirectangular, but it isn't.
What is the correct way to change it to an equirectangular image?
I'm worried that simply stretching it will have side-effects that I'm unaware of.