[FFmpeg-user] Crop 4K Video into Four 1080p Videos?

[Clay D. Montgomery]

Hello,

     I'm wondering if it is possible to use ffmpeg to slice 4K video 
into a set of four 1080p videos and do it without scaling.

I have experimented with using the -s size option before the input, but 
I have not found a way to offset the position for cropping the video.

This also might require rotating the output videos by 90 degrees.

I would appreciate any advise on this.


Thanks, Clay