Ok This wont happen ok it is more of a what if. But letts say I was building a home theater, with a 4k projector and a huge screen. (150-200") Let me quote from a website here
"In order to scale 1080p content up to 4K, Kipnis uses an array of five MacBook Pros to do all of the necessary number crunching to make images work on an 18-foot wide screen.
But I know not all sources are in 4k so what type of program would do that, and if you threw a 10 core xeon at it would it work. Again i am just curoius and was not really finding anything in my searches.