Adds a slider for playback speed control on YouTube videos.
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// ==UserScript==
// @name YouTube - Playback Speed Slider
// @name:fr YouTube - Curseur de vitesse de lecture
// @name:es YouTube - Deslizador de velocidad de reproducción
// @name:de YouTube - Wiedergabegeschwindigkeit-Schieberegler
// @name:it YouTube - Cursore della velocità di riproduzione
// @name:zh-CN YouTube - 播放速度滑块
// @namespace https://gist.github.com/4lrick/8149bd289cf94889a97aae9732a17144
// @version 1.2
// @description Adds a slider for playback speed control on YouTube videos.
// @description:fr Ajoute un curseur pour contrôler la vitesse de lecture des vidéos YouTube.
// @description:es Agrega un deslizador para controlar la velocidad de reproducción en videos de YouTube.
// @description:de Fügt einen Schieberegler zur Steuerung der Wiedergabegeschwindigkeit in YouTube-Videos hinzu.
// @description:it Aggiunge un cursore per controllare la velocità di riproduzione dei video di YouTube.
// @description:zh-CN 在YouTube视频中添加播放速度控制滑块。
// @author 4lrick
// @match https://www.youtube.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @grant GM_unregisterMenuCommand
// @license GPL-3.0-only
// ==/UserScript==
(function () {
'use strict';
const CONSTANTS = {
MIN_SPEED: 0.25,
MAX_SPEED: 10.0,
DEFAULT_SPEED: 1.0,
DEFAULT_SPEED_STEP: 0.05,
};
const STORAGE_KEY = 'yt-player-speed';
const REMEMBER_SPEED_KEY = 'rememberSpeed';
const SPEED_STEP_KEY = 'speedStep';
let speedStep = GM_getValue(SPEED_STEP_KEY, CONSTANTS.DEFAULT_SPEED_STEP);
let rememberSpeed = GM_getValue(REMEMBER_SPEED_KEY, true);
let savedSpeed = parseFloat(localStorage.getItem(STORAGE_KEY)) || CONSTANTS.DEFAULT_SPEED;
let rememberSpeedMenuId, speedStepMenuId;
let sliderRef = null;
let observer = null;
function updateRememberSpeedMenu() {
if (rememberSpeedMenuId) {
GM_unregisterMenuCommand(rememberSpeedMenuId);
}
const status = rememberSpeed ? 'ON' : 'OFF';
rememberSpeedMenuId = GM_registerMenuCommand(`Remember speed (current: ${status})`, toggleRememberSpeed);
}
function updateSpeedStepMenu() {
if (speedStepMenuId) {
GM_unregisterMenuCommand(speedStepMenuId);
}
speedStepMenuId = GM_registerMenuCommand(`Set speed step (current: ${speedStep})`, setSpeedStep);
}
function toggleRememberSpeed() {
const video = document.querySelector('video');
if (!video) return;
rememberSpeed = !rememberSpeed;
if (rememberSpeed) {
const currentSpeed = video.playbackRate;
localStorage.setItem(STORAGE_KEY, currentSpeed);
savedSpeed = currentSpeed;
}
GM_setValue(REMEMBER_SPEED_KEY, rememberSpeed);
updateRememberSpeedMenu();
}
function setSpeedStep() {
const input = prompt('Enter a new speed step (e.g., 0.25):', speedStep);
const newSpeedStep = parseFloat(input);
if (!isNaN(newSpeedStep) && newSpeedStep > 0) {
speedStep = newSpeedStep;
GM_setValue(SPEED_STEP_KEY, speedStep);
updateSpeedStepMenu();
if (sliderRef) {
sliderRef.step = String(speedStep);
}
} else {
alert('Invalid input. Please enter a positive number.');
}
}
function applyRememberedSpeed(video) {
if (rememberSpeed && video) {
video.playbackRate = parseFloat(savedSpeed);
}
}
function initMenu() {
const menuButton = document.querySelector('.ytp-settings-button');
const menu = document.querySelector('.ytp-settings-menu');
if (menuButton && menu) {
menu.style.opacity = '0';
menuButton.click();
menuButton.click();
menu.style.opacity = '1';
}
}
function formatSpeed(value) {
const rounded = Math.round(value * 100) / 100;
return rounded % 1 === 0 ? `${rounded.toFixed(0)}x` : `${rounded}x`;
}
function handleSlider(slider, video, speedValue) {
const inputListener = () => {
const newSpeed = parseFloat(slider.value);
video.playbackRate = newSpeed;
speedValue.textContent = formatSpeed(newSpeed);
if (rememberSpeed) {
savedSpeed = newSpeed;
localStorage.setItem(STORAGE_KEY, newSpeed);
}
slider.style.setProperty('--yt-slider-shape-gradient-percent', `${(newSpeed / slider.max) * 100}%`);
};
const wheelListener = (e) => {
e.preventDefault();
const delta = e.deltaY < 0 ? speedStep : -speedStep;
let newSpeed = parseFloat(slider.value) + delta;
newSpeed = Math.max(parseFloat(slider.min), Math.min(parseFloat(slider.max), newSpeed));
slider.value = newSpeed;
video.playbackRate = newSpeed;
speedValue.textContent = formatSpeed(newSpeed);
if (rememberSpeed) {
savedSpeed = newSpeed;
localStorage.setItem(STORAGE_KEY, newSpeed);
}
slider.style.setProperty('--yt-slider-shape-gradient-percent', `${(newSpeed / slider.max) * 100}%`);
};
slider.addEventListener('input', inputListener);
slider.addEventListener('wheel', wheelListener);
}
function createSlider(playbackSpeedContent, video) {
playbackSpeedContent.textContent = '';
const container = document.createElement('div');
container.style.display = 'flex';
container.style.alignItems = 'center';
const speedValue = document.createElement('span');
speedValue.textContent = formatSpeed(video.playbackRate);
speedValue.style.width = '50px';
const slider = document.createElement('input');
slider.type = 'range';
slider.min = String(CONSTANTS.MIN_SPEED);
slider.max = String(CONSTANTS.MAX_SPEED);
slider.step = String(speedStep);
slider.value = video.playbackRate;
slider.classList.add('ytp-input-slider');
slider.style.margin = '0 10px';
slider.style.setProperty('--yt-slider-shape-gradient-percent', `${(video.playbackRate / slider.max) * 100}%`);
slider.addEventListener('click', (e) => e.stopPropagation());
handleSlider(slider, video, speedValue);
container.appendChild(speedValue);
container.appendChild(slider);
playbackSpeedContent.appendChild(container);
sliderRef = slider;
}
function findPlaybackSpeedMenuItem() {
const menuItem = document.querySelector('.ytp-menuitem[aria-label*="Playback speed"]');
if (menuItem) return menuItem;
const speedIcon = document.querySelector('.ytp-menuitem-icon svg path[d*="M10,8v8l6-4L10,8"], .ytp-menuitem-icon svg path[d*="M9.80 1.22C8.59"], .ytp-menuitem-icon svg path[d*="M12 1c1.44"]');
return speedIcon ? speedIcon.closest('.ytp-menuitem') : null;
}
function setupSliderMenuItem() {
const video = document.querySelector('video');
if (!video) return;
applyRememberedSpeed(video);
const playbackSpeedMenuItem = findPlaybackSpeedMenuItem();
if (!playbackSpeedMenuItem) return;
const playbackSpeedContent = playbackSpeedMenuItem.querySelector('.ytp-menuitem-content');
if (playbackSpeedContent && !playbackSpeedContent.querySelector('input[type="range"]')) {
createSlider(playbackSpeedContent, video);
initMenu();
}
}
function observeVideoChanges() {
if (observer) {
observer.disconnect();
}
observer = new MutationObserver(setupSliderMenuItem);
observer.observe(document.body, { childList: true, subtree: true });
}
updateSpeedStepMenu();
updateRememberSpeedMenu();
observeVideoChanges();
})();