Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a movie that I shot at 240 frames per second. I'd like to play it back at 24 frames per second on my Mac. How can I do this?

How do I slow down playback to 10% speed for an MP4 file?

share|improve this question
VLC allows you to slow down playback speed. Just press ⌘- a couple of times. It's not very fine grained though. Does that suffice for your needs? – slhck Dec 29 '12 at 17:33
up vote 8 down vote accepted

In QuickTime Player option-clicking the forward button increases the speed by 0.1. Clicking the backward button plays videos in reverse though. You can slow down videos by running this in AppleScript Editor:

tell application "QuickTime Player" to set rate of document 1 to 0.1

Or through a terminal:

osascript -e 'tell application "QuickTime Player" to set rate of document 1 to 0.1'

VLC's playback speed can be changed in smaller increments from the menu bar.

In the menu, the lowest you can set is 0.25. If you press ⌘- the rate can be set even lower, but only to fixed values of 0.5, 0.33, 0.25, 0.12, 0.06, 0.03 and 0.02.

In Movist you can press ⇧⌘← or adjust the slider in the control HUD:

Movist can reduce the playing speed by half, not more.

share|improve this answer
VLC's playback speed, controlled through the menu bar, only goes down to 25%, not 10% as the OP needs it. Movist only goes to 50%. Controlling QuickTime is the only working solution in that case. – slhck Dec 29 '12 at 19:25
Thanks! The VLC one worked, I didn't know about the control key. However, the Quicktime one didn't work. It claimed that it was running at .1 speed, but in reality it was about .8. Very odd. – jedberg Dec 30 '12 at 2:45

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.