I am trying to replicate Datamoshing with After Effects. I'm close but I need to link the displacement map to motion vectors rather than just colors and brightness values. I know AE recognizes motion vectors as it uses them for motion blur. If there is a way to extract and move P/B-frames and apply them to other I frames that would be perfect but I haven't found that yet.

I figure if i could translate motion vectors into shades of black and white i could apply the displacement map to that layer using luminosity. Is there any way to do that? Perhaps extracting motion blur as a separate layer with an alpha channel?

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The easiest way to get this kind of effect is to use Glitch - a plugin from aescripts. It's not going to let you properly combine two sources, but it will go a long way towards giving you "broken" looking digital video...

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