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extract motion from footage
Hi all,
I have some video of people running from behind trees. The camera was set up very still and doesn’t move throughout the clip. The only thing that’s moving are the people running around.
I would like to extract only the footage of the running people and place them in a different clip of some other trees.
I’ve got: Prem Pro 2.0, AE CS4, Mocha, Re:Visions Twixtor and FieldsKit.
I’ve had a look at the “How do you cut out an actor from the background (Rotoscoping)?” FAQ under AE, but it seems to mainly about removing stuff you don’t want, or is at a conceptual level.
Any ideas?
John
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3 Replies
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You’ll need to rotoscope them out.
Color Grading presets for After Effects, Premiere, etc., plus free presets and more.
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Thanks for the tip Robert. I thought I solved this problem myself after a bit more looking around. The Premiere effect “difference matte” sounds absolutely perfect for what I’m after. The only problem is, it doesn’t seem to work! Has anyone else had experience with this effect?
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There’s a difference matte in AE as well, the problem is that, indeed, it basically is useless.
I’ve only tried it a few times but it tends to result in crusty edges and unwanted transparency due to tiny differences, compression, noise etc.This other current thread
https://forums.creativecow.net/thread/2/953785
has a few youtube examples of people playing around with it, and those demonstrate its shortcomings quite well.I think the general consensus is that it’s not worth the bother.
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