So when the piece enters the machine, does it have to be perfectly sized? What about an 'untrue' timber? Twists?

Just to humble myself with my auger bit and chisel, I'm curious to know how long the machine takes to cut a post with, lets say, joinery exiting from all sides... Is the machine capable of working four sides in one pass or does the operator have to flip the piece?

Cheers,
Brock