I want to play videos in iTunes faster (1x, 2x, double speed, etc.) or maybe slower. How do I do that?
Right click on the file in iTunes and choose "Show in Finder." Then right click the file and open in Quicktime Player. In Quicktime Player you can choose the playback speed by using the A/V Controls (Command + K or Window>A/V Controls). From there, you can select the playback speed:
Alternatively, you could use VLC or another music player.
The Cmd+K shortcut no longer works in Lion or Mavericks.
The double arrow allows for integer increases in playback speed.
Quicktime Player allows you to play the audio faster, but not slower.
The chosen answer, by @daviesgeek, works for Quicktime Player 7 (Snow Leopard or earlier).
If you're on a later version (well, I only tested this on macOS Sierra and Quicktime 10.4), you can play it faster by doing:
- opt + click-on-fast-forward-button. This will increase playback by 0.1x each time.
- opt + right-arrow. This one increases from 1x to 2x to 5x.
You cannot play at a slower speed though (but you can play backwards at speeds greater than 1x).
Folks, you can download Quicktime Player 7, which is for Snow Leopard or later Mac OS, and works with older media files (as well as current ones, it seems). It has the variable speed functionality you're seeking.
No guarantees this link will work whenever you read this, but it's working now, Nov 2015: https://support.apple.com/kb/DL923?locale=en_US
(Why Apple removed this functionality from Quicktime, who knows.)
Once installed, then play the audio file by first locating it in Finder, and use CMD-click to "open with" Quicktime Player 7. Voila.
I have done this with Safari Version 12.1.1 (14607.2.6.1.1).
I prefer to use Quicktime built into Safari instead of VLC, because slowing down audio / video files in VLC sound harsh.