Youtube H.264

use H.264 on youtube. based on https://github.com/erkserkserks/h264ify.

K instalaci tototo skriptu si budete muset nainstalovat rozšíření jako Tampermonkey, Greasemonkey nebo Violentmonkey.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Violentmonkey.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Userscripts.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat manažer uživatelských skriptů.

(Už mám manažer uživatelských skriptů, nechte mě ho nainstalovat!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(Už mám manažer uživatelských stylů, nechte mě ho nainstalovat!)

// ==UserScript==
// @name         Youtube H.264
// @namespace    http://www.youtube.com
// @version      1.1.2
// @description  use H.264 on youtube. based on https://github.com/erkserkserks/h264ify.
// @match        http://youtube.com/*
// @match        https://youtube.com/*
// @match        http://www.youtube.com/*
// @match        https://www.youtube.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==


// code from https://github.com/erkserkserks/h264ify/blob/master/src/inject/inject.js

var h264ify = function () {
    // Override video element canPlayType() function
    var videoElem = document.createElement('video');
    var origCanPlayType = videoElem.canPlayType.bind(videoElem);
    videoElem.__proto__.canPlayType = function (type) {
        if (type === undefined) return '';
        // If queried about webM/vp8/vp8 support, say we don't support them
        if (type.indexOf('webm') != -1
            || type.indexOf('vp8') != -1
            || type.indexOf('vp9') != -1) {
            return '';
        }
        // Otherwise, ask the browser
        return origCanPlayType(type);
    }
    
    // Override media source extension isTypeSupported() function
    var mse = window.MediaSource;
    var origIsTypeSupported = mse.isTypeSupported.bind(mse);
    mse.isTypeSupported = function (type) {
        if (type === undefined) return '';
        // If queried about webM/vp8/vp8 support, say we don't support them
        if (type.indexOf('webm') != -1
            || type.indexOf('vp8') != -1
            || type.indexOf('vp9') != -1) {
            return '';
        }
        // Otherwise, ask the browser
        return origIsTypeSupported(type);
    }
};

h264ify();