There are two ways to achieve a slow motion effect. You can either playback a clip at a frame rate that is slower than the one at which it was recorded (ex: record at 60fps and play back at 24fps) (which is also called “conforming”) or you can have software create as many in between frames as needed to achieve the desired frame rate. One often used program to do the later is called Twixtor.

While there are countless ways to achieve these results, here is a great video from Rich Harrington:

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