-
extract moving people 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
-
6 Replies
-
Getting rid of the people and leaving the people would be simple, but changing the trees is a bit more complex.
It would be really hard to match up. You could composite the new trees over the existing footage and then mask the areas out to match the people poking through. That could be hard to get things lined up, plus the lighting and everything else may not look right if you are using different footage. Maybe some tree stills could be used to cover over bad spots. You said the camera was still so that should make it a bit easier.
That is all I can think of, but I am sure there are many smarter then me on these forums.
-
What you have on your hands and many hours of rotoscoping. No way around it.
Vince Becquiot
Kaptis Studios
San Francisco – Bay Area -
Lots of feathering if you can get away with a more ‘etherial look.’
I had a tape stolen once and spent many, many hours inserting clips from a 2006 speech into a 2007. It was time consuming and did not look like Lucasfilm when it was done but the customer was happy and thought it looked kind of cool.
Good luck.
todd
Todd Roush
Dreamscape Digital Media
Panny DVX-100’s but changing so Sony or Cannon HDV soon. -
Thanks for all the tips and suggestions guys – great! I just noticed the “difference matte” in Prem Pro. Going by the instructions (and the demonstration images), this is the perfect tool to use. The only problem is I can’t seem to get it to work – i.e. following the instruction doesn’t give me anything remotely like the final product. Has anyone had experience with the difference matte? I’ve seen a few posts out there that aren’t too complimentary of it.
-
I’ve tried difference mattes in a few different software packages over the years (though not Premiere), and it has never really worked. Rotoscoping is probably what’s needed.
-jeff
-
[John Kis] “difference matte […] this is the perfect tool to use”
It would be if the background were perfectly the same in each frame. Unfortunately, modern compression schemes are enough to make each frame appear sufficiently different that it renders the tool useless.
I agree with the others, rotoscoping in a special-effects package is the only way to go.
Cheers
Eddie
Reply to this Discussion! Login or Sign Up