This is one of the printing presses at NWN changing the paper over.
The paper is being fed into the press at about 40mph and each roll contains many kilometres of paper, and they weigh more than 1/3-1/2 of a ton each.
The machine offers up the new roll and spins it up to speed, before doing a "blink and you miss it" swap (at 1:09-1:10) between the rolls still feeding the press with a continous supply of paper at 40mph!
Normally only 1 or 2 copies are wasted in the cross over, an amazing feat for machines that can print upto 70,000 copies per hour!
The clattering in the background is the folding machine situated just behind, each time it clicks thats another copy or 2 of the newspaper folded.