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Tracking an object in front of an image that needs to be changed

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Bisera Mihajlovska
Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 11:05:40 am

Hey guys! I have a simple tracking issue, a have a video of a billboard that needs to contain custom graphics.
The issue is, in front of the billboard, there is a soccer ball that flies in front of it. How do i track the ball so when it moves, it flies above my newly put graphic on the billboard?
Thanks ☺


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Cassius Marques
Re: Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 12:17:09 pm

If you're using AE's default tracker, just track the ball, duplicate the footage, create a shape like the ball and link to the null you used as target of the tracker. now set the footage to use the shape as an alpha matte. keep this new layers on top of the rest.

Cassius Marques
http://www.zapfilmes.com


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Bisera Mihajlovska
Re: Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 12:28:53 pm

Yes, thanks a lot, i will try this. I also have the Mocha plugin which i think it's a bit more accurate, so do you have any advice on how to use Mocha on this one?


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Cassius Marques
Re: Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 1:05:04 pm

I'm not sure what this mocha plugin outputs to AE when you use its foreground/layer settings (I don't use it). If its a mask just use that. If its coordenates, do the same as I said before (applying to a null). Or if you can output a black/white matte, use as a luma matte.

I suggest you search for mocha foreground element. Google should help you out. Good luck.

Cassius Marques
http://www.zapfilmes.com


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Dave LaRonde
Re: Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 2:15:01 pm

I think it depends on the speed of the ball. There may be a lot of motion blur in your shot. You may have to animate a feathered mask around the ball by hand. You may have to animate the mask around just a few frames.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Bisera Mihajlovska
Re: Tracking an object in front of an image that needs to be changed
on Mar 14, 2017 at 3:40:01 pm

Yes, i actually masked it frame by frame. Luckily, the ball is moving quite fast and it's not very detailed. The whole shot is around 2,3 seconds so it wasn't that big of a deal. Thanks a lot, have a great day!


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Ross Shain
Re: Tracking an object in front of an image that needs to be changed
on Mar 22, 2017 at 10:16:50 pm

This new Mocha video tutorial should answer some questions:


Ross Shain
Imagineer Systems
http://www.imagineersystems.com


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