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2

In iMovie you can change the speed of a clip by selecting it in the timeline and then clicking on the icon that looks like a speedometer: Then click on the "Speed:" popup menu and choose "Fast" or "Custom". The "Custom" setting lets you choose how much faster to make it (like 200%, or 50%).


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You can use ffmpeg, a command line program, to double the video speed: ffmpeg -i input.mp4 -vf setpts=0.5*PTS output.mp4



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