// ==UserScript==// @name        YouTube video/mp4// @version     1.0// @description Plays video in h.264 format.// @author      gvvad// @run-at      document-start// @include     *.youtube.com/*// @grant       none// @noframes// @license     MIT; https://opensource.org/licenses/MIT// @copyright   2020, gvvad// @namespace   https://greasyfork.org/users/100160// ==/UserScript==(function () {'use strict';function getCustomMimeChecker(producer, isBool) {const rejector = /(webm|vp8|vp9|av01)/;return function (mime) {if (rejector.test(mime)) {return (isBool) ? false : '';}return producer(mime);};}let videoElem = document.createElement('video');let v_proto = Object.getPrototypeOf(videoElem);v_proto.canPlayType = getCustomMimeChecker(v_proto.canPlayType.bind(videoElem), false);Object.setPrototypeOf(videoElem, v_proto);if (window.MediaSource === undefined) return;window.MediaSource.isTyp###pported = getCustomMimeChecker(window.MediaSource.isTyp###pported, true);})();