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help with tracker
i’m trying to composite an extra arm onto footage of a person. the person is wearing black and the background is a light gray-lots of contrast in the luminance. the person moves slightly so i thought i would track his shoulder and then apply that to the extra arm. i can’t seem to get good tracking keyframes though. maybe once every second, it will “jump” maybe 5 pixels, and there isn’t any movement to justify this. any tips?
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2 Replies
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A couple of thoughts – Take them for what thye are worth, which isn’t much.
Make sure your motion tracker is using luminance as the tracking channel (instead of RGB or saturation). You may also want to turn on the adapt feature on every frame.
I have no idea if this could cause the problem, but Is your comp frame rate and the footage frame rate the same? Check in the composition settings, and the interperate footage dialog to see.
Also is the footage interlaced – make sure to turn on “track fields” if it is.
Another thing I can think of is that you aren;t placing your search region well. That’s the outer box. You should place it to focus on where you know the feature you are tracking will be in the next frame. It may be as simple as correcting this every little bit, because it just might be losing the feature it’s looking for.
Also, If there is a lot of motion blur in there, it’s hard to track – and I hate to say this, a lot of motion tracking is correcting tracking errors.
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Aharon Rabinowitz
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http://www.allbetsareoff.com
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Check out Adobe’s tutorial pages: https://studio.adobe.com/us/search/main.jsp
There are a number of them on motion tracking.
John
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