I need to convert vr 360 video to cubic 2x3 format. Usually I use command v360=equirect:c3x2 . But basically it just converts to a cubic square shape with a length, width, and height ratio of 1:1:1. I want to change it so that it can produce 3x2 frames that when merged will create a rectangular box with a different ratio from the original ratio input. For example, length:width:height is 2:1:0.7, for example. I looked for documentation but it seems like few users have done anything about this. I hope you can help me. Thanks a lot