KB Issue
When using the After Effects CS6
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Camera Tracker
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feature, you might run into some issues regarding your footage, and the Tracker.
Issue Details
After Effects
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CS6 has a really cool new feature called Tracking Camera. However, using the Tracking Camera feature with your footage, you might receive the following error:

After Effects CS6
unable to solve camera for this frame
Recreate Issue
Load footage that is all over the place, where the camera moves a lot, and the subjects within the footage, are not always in the same place.
Resolve Issue
  1. Import the footage into a new Comp.
  2. Scroll through and find where you want to add the 3D Camera Tracking
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    .
  3. Once you have found the section, make sure that from the beginning to the end
  4. The footage does not include any obstacles that could cause the Camera Tracker to deviate from its course.
  5. Remove the sections of the footage that you will not be using.
  6. Only keep the footage that you will be tracking.
  7. This will ensure the Tracker tracks only high-quality footage.