Stretch the width on SBS video but keep same height

[daitj]

Continue from #20, I came back with a video (180 degree SBS 3D VR)

This is screenshot of the video without VR-reversal:

Currently it looks like this on "SBS half width mode" using VR-reversal, The horizontal view(width) each side is squeezed, when you look this through VR googles (cardboard vr).

This is how I want it to look like, which is the default implementation in this project

Video from the example