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Comment by sillysaurus | Hacker News Reader

How do you watch a YouTube or Vimeo video at 2x speed? Is there a browser extension or something? I've often wanted to do that.

Well first make sure you're opted into HTML5 beta/playback whatever on Youtube/Vimeo.

A random result from my previous link is:

Click the gear icon where you can select the quality. Playback speed should also be there. Sometimes it isn't.

In which case, force it into the popout view by tweaking the URL:

Huzzah. :)

If there's no option, just use keepvid.com or similar and play it with Mplayer. Uses way less CPU too.

with html5 player:

  document.getElementsByTagName('video')[0].playbackRate = 2