 " Cog " needed only limited post @-@ production work , as the decision had been made early on to eschew computer @-@ generated imagery wherever possible . To further reduce the work required , " Barnsley " , a specialist in the Flame editing tool ( real name , Andrew Wood ) , from The Mill , spent a lot of time on set during filming , where he advised the film crew on whether particular sections could be accomplished more easily by re @-@ filming or by manipulating the image afterwards . Even so , the constant movement of the components on @-@ camera made it difficult to achieve a seamless transition between the two 60 @-@ second shots . Several sections also required minor video editing , such as re @-@ centering the frame to stay closer to the action , removal of wires , highlighting a spray of water , and adjusting the pace for dramatic purposes . 
