Sunday, July 08, 2007
vfx: rewinding surveillance video
If there's one thing I think I'm good at, it's artistically distorting video. In this shot, Ben is viewing and rewinding a highly distorted surveillance video over and over to try to figure out what caused the spinner to break. To create this effect I started out by splitting the video image into separate R, G and B channels, then used the wiggler to shake the layer positions. Over that I comped some video grundge that I always keep handy. It seems obvious, but in order to make a grundge layer look good you have to use a displacement map so that the grundge interacts with the video layer. Without this interaction, the grundge looks like it's floating on top of the other layer and it looks really bad. Still, I see that done all the time. Anyway, the shot came out nicely I thought. I'm not sure if I'm going to show it as is, or play it on a TV and shoot it again.
I keep forgetting how to get that bad vertical hold look so I'll describe it here as a reminder. I use the Pete's Plugin (free) filter called Slide. Unfortunately, it only slides horizontally so you have to rotate the image to roll vertically. Pete's Plugins also has a video pixel filter which looks pretty nice, but I wanted to avoid the scan line look for this video.
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