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Retiming footage in the editorial process is just as common as making a trim; it’s something that you’ll need to do all the time. You might change the speed of a clip for aesthetic reasons if you want an action to happen faster or slower. You might also change the speed of a clip to reverse action or to have a clip fit a specific period of time. You might even want to stop action altogether and create what’s known as a freeze frame (essentially a still where you can control the duration). Regardless of the reason, changing the speed of clips is easy.
Changing the speed of a clip in Final Cut Pro X is very straightforward. You can create clips that are slower or clips that are faster, and you can even perform a variable speed change where a clip ramps between high speed and slow motion and back to normal speed (you see this effect in movies and commercials all the time).