Force websites to use alternative video codecs by blocking AV1.
// ==UserScript==
// @name AV1 Codec Blocker
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @author ElectroKnight22
// @namespace electroknight22_av1_codec_blocker_namespace
// @version 1.0.0
// @description Force websites to use alternative video codecs by blocking AV1.
// @match *://*/*
// @run-at document-start
// @grant none
// @inject-into page
// @license MIT
// ==/UserScript==
/*jshint esversion: 11 */
(function () {
'use strict';
// Modern Logic
if (window.MediaSource) {
const originalIsTypeSupported = window.MediaSource.isTypeSupported;
window.MediaSource.isTypeSupported = function (mime) {
if (typeof mime === 'string' && (mime.includes('av01') || mime.includes('av1'))) return false;
return originalIsTypeSupported.call(this, mime);
};
}
// Legacy Fallback Logic
const originalCanPlayType = window.HTMLMediaElement.prototype.canPlayType;
window.HTMLMediaElement.prototype.canPlayType = function (mime) {
if (typeof mime === 'string' && (mime.includes('av01') || mime.includes('av1'))) return '';
return originalCanPlayType.call(this, mime);
};
})();