[FFmpeg-user] Hello. Can you help me answer questions about converting vr 360 videos to cubic 2x3 format

[Anh The]

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