HTML5 increase youtube speed 2x from url?

I would like to know how to speed up a youtube video 2x without the user clicking on the HTML5 (of the video), but instead by modifying the URL.

For example, I know how to watch video starting at a specific time by appending to the URL the parameter &t=1m1s (for 1 minute and one second). Is it possible to use a similar method to speed up the video 2x?

What parameters should I add to the URL to watch video in double speed (I'm using html5)?

Solution

There's no way to change playback speed by URL arguments.

Anyway, if you're working with HTML, you can take advantage of the YouTube Player iFrame API.

Here's how to configure your player with all the JavaScript: https://developers.google.com/youtube/iframe_api_reference#Getting_Started

And here's the function you're looking for to set playback speed: https://developers.google.com/youtube/iframe_api_reference#Playback_rate

So you can edit your onPlayerReady function like this:

function onPlayerReady(event) {
  player.setPlaybackRate(2); // This is what you're looking for
  event.target.playVideo();
}

You can of course pass on step 5 of the documentation as this will stop your video from playing after six seconds.

If you have trouble setting that up, I'll edit a JSFiddle later (couldn't do it at work as my Flash plugin won't launch).

Update :

Here's the JSFiddle working fine with this code exactly: http://jsfiddle.net/jpreynat/e11oy0eu/