☰

Greasy Fork is available in English.

YouTube - Remaining Time Indicator

Displays the remaining duration of a YouTube video next to the video duration, taking into account the playback rate.

// ==UserScript==
// @name                          YouTube - Remaining Time Indicator
// @name:fr                       YouTube - Indicateur du temps restant
// @name:es                       YouTube - Indicador de tiempo restante
// @name:de                       YouTube - Anzeige der verbleibenden Zeit
// @name:it                       YouTube - Indicatore del tempo rimanente
// @name:zh-CN                    YouTube - 剩余时间指示器
// @namespace                     https://gist.github.com/4lrick/cf14cf267684f06c1b7bc559ddf2b943
// @version                       1.9
// @description                   Displays the remaining duration of a YouTube video next to the video duration, taking into account the playback rate.
// @description:fr                Affiche la durée restante d'une vidéo YouTube à côté de la durée de la vidéo, en tenant compte de la vitesse de lecture.
// @description:es                Muestra la duración restante de un video de YouTube junto a la duración del video, teniendo en cuenta la velocidad de reproducción.
// @description:de                Zeigt die verbleibende Dauer eines YouTube-Videos neben der Videodauer an und berücksichtigt dabei die Wiedergabegeschwindigkeit.
// @description:it                Mostra la durata rimanente di un video di YouTube accanto alla durata del video, tenendo conto della velocità di riproduzione.
// @description:zh-CN             在视频时长旁边显示YouTube视频的剩余时长，考虑播放速度。
// @author                        4lrick
// @match                         https://www.youtube.com/*
// @icon                          https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant                         none
// @license                       GPL-3.0-only
// ==/UserScript==

(function() {
    'use strict';
    let timeDisplay;

    function createTimeDisplayElement() {
        const timeDisplayElement = document.createElement('span');

        timeDisplayElement.style.display = 'inline-block';
        timeDisplayElement.style.marginLeft = '10px';
        timeDisplayElement.style.color = '#ddd';

        return timeDisplayElement;
    }

    function displayRemainingTime() {
        const videoElement = document.querySelector('video');
        const isLive = document.querySelector('.ytp-time-display')?.classList.contains('ytp-live');
        const timeContainer = document.querySelector('.ytp-time-contents');

        if (videoElement && !isLive && timeContainer) {
            if (!timeDisplay) {
                timeDisplay = createTimeDisplayElement();
                timeContainer.appendChild(timeDisplay);
            }

            const timeRemaining = (videoElement.duration - videoElement.currentTime) / videoElement.playbackRate;
            const hours = Math.floor(timeRemaining / 3600);
            const minutes = Math.floor((timeRemaining % 3600) / 60);
            const seconds = Math.floor(timeRemaining % 60);

            timeDisplay.textContent = `(${hours > 0 ? `${hours}:` : ''}${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')})`;
        } else if (timeDisplay) {
            timeDisplay.remove();
            timeDisplay = null;
        }

        requestAnimationFrame(displayRemainingTime);
    }


    function initRemainingCounter() {
        const timeContainer = document.querySelector('.ytp-time-contents');

        if (timeContainer) {
            timeDisplay = createTimeDisplayElement();
            timeContainer.appendChild(timeDisplay);
            requestAnimationFrame(displayRemainingTime);
            observer.disconnect();
        }
    }

    function checkVideoExists() {
        const videoElement = document.querySelector('video');

        if (videoElement) {
            initRemainingCounter();
        }
    }

    const observer = new MutationObserver(checkVideoExists);
    observer.observe(document.body, { childList: true, subtree: true });
})();