YouTube Auto Reload When Video unavailable

Reloads YouTube when a video fails. Active tab only. May need to press F5 once on first visit.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

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

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

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

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

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

(I already have a user script manager, let me install it!)

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.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         YouTube Auto Reload When Video unavailable 
// @name:zh-TW   YouTube 影片無法播放自動重整
// @name:ja      YouTubeの動画が再生できません時に自動リロード
// @namespace    https://example.com/
// @version      2.6
// @description  Reloads YouTube when a video fails. Active tab only. May need to press F5 once on first visit.
// @description:zh-TW 卡住的 YouTube 影片自動重新整理(僅限活頁籤)。首次可能需手動按一次 F5。
// @description:ja YouTubeの動画が読み込めない時に自動リロードします(アクティブタブのみ)。初回はF5が必要な場合があります。
// @match        https://www.youtube.com/watch*
// @grant        none
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    let isReloading = false;
    let observer = null;

    // 檢查是否是「直播尚未開始」狀態
    function isLiveUpcomingFromPlayerResponse() {
        try {
            const ytData = window.ytInitialPlayerResponse;
            const status = ytData?.playabilityStatus?.status;
            return status === 'LIVE_STREAM_OFFLINE';
        } catch (e) {
            return false;
        }
    }

    const checkVideoStatus = () => {
        if (document.hidden) return true;

        if (isLiveUpcomingFromPlayerResponse()) {
            return true; // 直播尚未開始 → 不 reload
        }

        const video = document.querySelector('video');
        const errorBox = document.querySelector('.ytp-error, .ytp-error-content-wrap');

        if (
            (errorBox && errorBox.offsetParent !== null) ||
            !video ||
            (video.currentTime === 0 && video.paused)
        ) {
            return false;
        }

        return true;
    };

    const tryReload = () => {
        if (isReloading) return;
        isReloading = true;
        location.reload();
    };

    const startObserver = () => {
        if (observer) return;

        const target = document.body;
        if (!target) return;

        observer = new MutationObserver(() => {
            if (!checkVideoStatus()) tryReload();
        });

        observer.observe(target, {
            childList: true,
            subtree: true
        });

        if (!checkVideoStatus()) tryReload();
    };

    const stopObserver = () => {
        if (observer) {
            observer.disconnect();
            observer = null;
        }
    };

    window.addEventListener('load', () => {
        startObserver();
    });

    document.addEventListener('visibilitychange', () => {
        if (!document.hidden && !checkVideoStatus()) {
            tryReload();
        }
    });
})();