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Manipulating speed is made much easier by the technology behind digital video. When working with analogue tape, slowing the speed of playback could cause unwanted side effects like wobble and jitter. With digital source material, however, the computer can easily alter the number of frames per second. Slow motion in movies is often used in action scenes to show things that happen very quickly in more detail, which enhances the dramatic tension. For home movies it can also be useful for changing the pace of a scene, or simply to make a short clip last a bit longer than its original duration for the purposes of filling out some time.