[FFmpeg-user] Split video into subparts of the original one

[Diego Gullo @Bizmate]

Hi all

I am looking for a way to split a video into subscreen parts of it. For 
instance i want to take a 5min video lets say 400x800 and split it into 
4 parts/subvideos of 5min each made of a 4th of the original video. The 
result would be 4 videos all made of 200x400 pixels.

I have seen crop and other options could be used but I would prefer to 
have a reply from some expert.

The above should retain the audio from the original file to all the 
subvideos

Br

Diego