Because they would then have to camera track the whole clip to place the bins, and also make sure the bins stay in the correct positions when they reappear and disappear out of frame. In contrast, they only need to camera track the few frames when he does the kick. The quick movement of the ball also makes it harder to spot CGI errors IMO. Whereas if you have to fake the bins, you also have to deal with camera zoom, exposure changes, etc. that happen throughout the clip.
> The quick movement of the ball also makes it harder to spot CGI errors IMO. Whereas if you have to fake the bins, you also have to deal with camera zoom, exposure changes, etc. that happen throughout the clip.
Way back in the day, Michael Crichton's Rising Sun, it talks about primitive video editing (when some people are editing the video scene of a crime). Looking at security camera footage over a period of time is monotonous, but harder too is also editing the audio. You could stare at the screen and still easily overlook a glitch, but a hard cut/slice in the audio will catch your notice even when only minimal attention is being paid.
