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Frame Blending

When the frame rate of motion footage is lower than that of the composition, movement within the frame can appear jerky—either because the footage's native frame rate is lower than that of the composition, or because you time-stretched the footage. Whatever the case, After Effects reconciles this difference by repeating frames of the source footage. For example, each frame of a 15-fps movie is displayed twice in a composition with a frame rate of 30 fps. However, because there are not enough unique frames to represent full motion, the result can sometimes resemble a crude flip-book animation.

In these instances, you can smooth the motion by activating the Frame Blending switch. When Frame Blending is on, After Effects interpolates between original frames, blending them rather than simply repeating them (Figure 12.1 and Figure 12.2).


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