Fixed X1 Send to TV bookmarklet JS to transform all YouTube URLs to use HD and auto play in full screen. The original JS only worked on m.youtube URLs and did not use HD or work correctly if you used the bookmarklet on your desktop.

bookmarklet

javascript:(function()%7Bvar z%3Ddocument.createElement(%27script%27)%3Bz.src%3D%27https://gist.githubusercontent.com/johnschult/10974466/raw/9aa0dbaaed5cb2c0871766db461e280932f3f2fb/bookmarklet-tv.js%27%3Bdocument.body.appendChild(z)%3B%7D)()

bookmarklet-tv.js

(function() {
    var parseOpenGraph = function(el) {
        var ns = 'og', data = {};
        var metas = document.getElementsByTagName("meta");

        ns = ns + ":";
        for (i=0; i<metas.length; i++) {
            var prop = metas[i].getAttribute('property'), key, value;
            if (prop && prop.substring(0, ns.length) === ns) {
                key = prop.substring(ns.length);
                value = metas[i].getAttribute('content');
                data[key] = data[key] || [];
                data[key].push(value);
            }
        }

        return data;
    };

    var ogpJson = parseOpenGraph(document.head);
    var videoParams = '';
    var ogVideo = ogpJson['video'] || ogpJson['video:url'] || ogpJson['video:secure_url'];
    var ogImage = ogpJson['image'] || ogpJson['image:secure_url'];
    if (ogVideo && ogImage) {
        videoParams = '&videoUrl=' + encodeURIComponent(ogVideo[0]) + '&videoImage=' + encodeURIComponent(ogImage[0]);
    } else if (ogVideo){
        videoParams = '&videoUrl=' + encodeURIComponent(ogVideo[0]) + '&videoImage=https://sendtotv.x1.comcast.net/media/images/default-video.png'
    }

    function loadPageVar(sVar) {
        return unescape(window.location.href.replace(new RegExp("^(?:.*[&\\?]" + escape(sVar).replace(/[\.\+\*]/g, "\\$&") + "(?:\\=([^&]*))?)?.*$", "i"), "$1"));
    }

    var url;
    if (window.location.href.indexOf("youtube") >= 0 ) {
        url = 'http://www.youtube.com/v/' + loadPageVar('v') + '?hd=1&autoplay=1&autohide=1';
    } else {
        url = window.location.toString();
    }

    var s = document.createElement('iframe');
    s.setAttribute('style','position:fixed; visibility:hidden; top:0px; left:0px; width:100%; height:100%; border:0px; background: rgba(0,0,0,.6); z-index: 2147483647');
    s.setAttribute('src', 'https://sendtotv.x1.comcast.net/panel/panel.html?url=' + encodeURIComponent(url) + videoParams);
    var loaded = false;
    s.onload = function() {
        if(loaded) {
            document.getElementsByTagName('body')[0].removeChild(s);
        }
        loaded = true;
        s.style.visibility = 'visible';
        s.focus();
    }
    document.getElementsByTagName('body')[0].appendChild(s);
})();