Frame blending
A method of smoothing the transition between individual frames when you modify the frame rate of a clip. For example, duplicating frames to create slow motion can result in a strobing, jittery effect. To minimize this, you can turn on Frame Blending, which creates new in-between frames, each a composite of two neighboring frames.
![An illustration showing a frame blended from two original frames.](https://help.apple.com/assets/6463E4828069923EF0370689/6463E4858069923EF0370691/en_US/50f2bfdfdfe983fb74832aad564d49fe.png)