I have a problem with camera on MacBook Pro 15'' mid 2015. While Windows "Camera" application shows correct image, in some applications image proportions are incorrect everything looks narrower.
OK. So I understand what's going on. When I set camera resolution in Windows running on Parallels 11 to 1600x1200 (4x3), the image aspect ratio gets distorted. It looks like the vertical resolution becomes 72dpi vs 96 dpi for horizontal. So when I see it in an application that assumes a square pixel, video becomes elongated in vertical direction. When I set aspect ratio to 4x3 in MacOS, I do not observe this issue. However, I am not sure what resolution do I get in this case. Maybe the 1600x1200 resolution is emulated in Parallels? In this case it is stretched incorrectly.