HTML5 increase youtube speed 2x from url?

I was trying to do this exact same thing earlier this week.

A solution purely from a URL parameter isn't possible. (or if it is, it's not documentation here: https://developers.google.com/youtube/player_parameters)

I came accros this JSFiddle by Johan Preynat: http://jsfiddle.net/jpreynat/e11oy0eu/

Worked for me, so hopefully it'll be useful for you too

HTML

<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<div id="player"></div>

JavaScript

// 2. This code loads the IFrame Player API code asynchronously.
var tag = document.createElement('script');

tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

// 3. This function creates an <iframe> (and YouTube player)
//    after the API code downloads.
var player;
function onYouTubeIframeAPIReady() {
    player = new YT.Player('player', {
        height: '390',
        width: '640',
        videoId: 'M7lc1UVf-VE',
        events: {
            'onReady': onPlayerReady
        }
    });
}

// 4. The API will call this function when the video player is ready.
function onPlayerReady(event) {
    player.setPlaybackRate(2);
    event.target.playVideo();
}

See also the YouTube documentation on this: https://developers.google.com/youtube/iframe_api_reference

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/