I created a timelapse video from iMovie software and set the time to 0.1 second for every image. But the final output is not satisfying. It seems a bit slow video. I need the clouds to move faster, but they are moving slowly. It is total of 30 second video. I need it to be 15 second video, so that I can get a desired effect. But I cannot change the setting lower then 0.1 second in iMovie. Any suggestions?

  • I have used the below link as reference: youtube.com/watch?v=dPlEAFyGznE Commented Jan 21, 2016 at 9:27
  • Can you remove every alternate image?
    – Gyan
    Commented Jan 21, 2016 at 10:09
  • @Mulvya: I need that clip to be HD, with more fps. Commented Jan 21, 2016 at 10:15
  • How does removing images change frame size (HD)? What's the fps of your current output?
    – Gyan
    Commented Jan 21, 2016 at 10:16
  • @Mulvya: I think it's 720fps right now. Though I'm not sure of it. I tried this for the first time. and above I've posted the youtube link from where I've done it. Commented Jan 21, 2016 at 10:43

2 Answers 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:

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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%).

  • Thanks a lot, it worked like a charm. But to me it gives maximum to double the speed. So I tried to do that process 3 times. Now, I have a 9 second video clip (that's amazing, and exactly what I thought of). Thanks again. Commented Jan 22, 2016 at 9:04

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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