This test uses 400 images for each type of key framing. A Pan and Tilt head followed the rectangle of the picture using Smooth then Linear key framing at the image corners.
The first part of the clip shows the effect on acceleration of the key framing effects by Differentially compositing the two clips. Most obvious effect is at the direction change at corners of the rectangle.
Clip two is Smooth key framing and clip three is the Linear key framing effect.

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