Make youtube videos in HD and automatically resize

youtube_hd.user.js

// ==UserScript==
// @name          Youtube HD
// @author        adisib
// @namespace     namespace_adisib
// @description   Select a youtube resolution and resize the player.
// @version       2024.01.17
// @match         https://*.youtube.com/*
// @noframes
// @grant         GM.getValue
// @grant         GM.setValue
// ==/UserScript==

// The video will only resize when in theater mode on the main youtube website.
// By default only runs on youtube website, not players embeded on other websites, but there is experimental support for embeds.
// To enable experimental support for embedded players outside of YouTube website, do the following steps:
//   add  " @include * "  to the script metadata
//   remove  " @noframes "  from the script metadata

// 2024.01.17
// Fix issue with user script managers that don't define GM

// 2024.01.14
// Partially fix auto theater mode again after more youtube changes
// Note that if you want to turn theater mode back off after using auto theater you have to click the button a few times. This is a known issue that hasn't been fixed yet.


(function() {
  "use strict";

  // --- SETTINGS -------

  // PLEASE NOTE:
  // Settings will be saved the first time the script is loaded so that your changes aren't undone by an update.
  // If you want to make adjustments, please set "overwriteStoredSettings" to true.
  // Otherwise, your settings changes will NOT have an effect because it will used the saved settings.
  // After the script has next been run by loading a video with "overwriteStoredSettings" as true, your settings will be updated.
  // Then after that you can set it to false again to prevent your settings from being changed by an update.

  let settings = {

	// Target Resolution to always set to. If not available, the next best resolution will be used.
	changeResolution: true,
	preferPremium: true,
	targetRes: "hd1080",
	// Choices for targetRes are currently:
	//   "highres" >= ( 8K / 4320p / QUHD  )
	//   "hd2880"   = ( 5K / 2880p /  UHD+ )
	//   "hd2160"   = ( 4K / 2160p /  UHD  )
	//   "hd1440"   = (      1440p /  QHD  )
	//   "hd1080"   = (      1080p /  FHD  )
	//   "hd720"    = (       720p /   HD  )
	//   "large"    = (       480p         )
	//   "medium"   = (       360p         )
	//   "small"    = (       240p         )
	//   "tiny"     = (       144p         )

	// Target Resolution for high framerate (60 fps) videos
	// If null, it is the same as targetRes
	highFramerateTargetRes: null,

	// If changePlayerSize is true, then the video's size will be changed on the page
	//   instead of using youtube's default (if theater mode is enabled).
	// If useCustomSize is false, then the player will be resized to try to match the target resolution.
	//   If true, then it will use the customHeight variables (theater mode is always full page width).
	changePlayerSize: false,
	useCustomSize: false,
	customHeight: 600,

	// If autoTheater is true, each video page opened will default to theater mode.
	// This means the video will always be resized immediately if you are changing the size.
	// NOTE: YouTube will not always allow theater mode immediately, the page must be fully loaded before theater can be set.
	autoTheater: false,

	// If flushBuffer is false, then the first second or so of the video may not always be the desired resolution.
	//   If true, then the entire video will be guaranteed to be the target resolution, but there may be
	//   a very small additional delay before the video starts if the buffer needs to be flushed.
	flushBuffer: true,

	// Setting cookies can allow some operations to perform faster or without a delay (e.g. theater mode)
	// Some people don't like setting cookies, so this is false by default (which is the same as old behavior)
	allowCookies: false,

	// Tries to set the resolution as early as possible.
	// This might cause issues on youtube polymer layout, so disable if videos fail to load.
	// If videos load fine, leave as true or resolution may fail to set.
	setResolutionEarly: true,

	// Enables a temporary work around for an issue where users can get the wrong youtube error screen
	// (Youtube has two of them for some reason and changing to theater mode moves the wrong one to the front)
	// Try disabling if you can't interact with the video or you think you are missing an error message.
	enableErrorScreenWorkaround: true,

	// Use the iframe API to set resolution if possible. Otherwise uses simulated mouse clicks.
	useAPI: true,

	// Overwrite stored settings with the settings coded into the script, to apply changes.
	// Set and keep as true to have settings behave like before, where you can just edit the settings here to change them.
	overwriteStoredSettings: false

  };

  // --------------------




  // --- GLOBALS --------


  const DEBUG = false;

  // Possible resolution choices (in decreasing order, i.e. highres is the best):
  const resolutions = ['highres', 'hd2880', 'hd2160', 'hd1440', 'hd1080', 'hd720', 'large', 'medium', 'small', 'tiny'];
  // youtube has to be at least 480x270 for the player UI
  const heights = [4320, 2880, 2160, 1440, 1080, 720, 480, 360, 240, 144];

  let doc = document, win = window;

  // ID of the most recently played video
  let recentVideo = "";

  let foundHFR = false;

  let setHeight = 0;


  // --------------------


  function debugLog(message)
  {
	if (DEBUG)
	{
	  console.log("YTHD | " + message);
	}
  }


  // --------------------


  // Used only for compatability with webextensions version of greasemonkey
  function unwrapElement(el)
  {
	if (el && el.wrappedJSObject)
	{
	  return el.wrappedJSObject;
	}
	return el;
  }


  // --------------------


  // Get video ID from the currently loaded video (which might be different than currently loaded page)
  function getVideoIDFromURL(ytPlayer)
  {
	const idMatch = /(?:v=)([\w\-]+)/;
	let id = "ERROR: idMatch failed; youtube changed something";
	let matches = idMatch.exec(ytPlayer.getVideoUrl());
	if (matches)
	{
	  id = matches[1];
	}

	return id;
  }


  // --------------------


  // Attempt to set the video resolution to desired quality or the next best quality
  function setResolution(ytPlayer, resolutionList)
  {
	debugLog("Setting Resolution...");

	const currentQuality = ytPlayer.getPlaybackQuality();
	let res = settings.targetRes;

	if (settings.highFramerateTargetRes && foundHFR)
	{
	  res = settings.highFramerateTargetRes;
	}

	let shouldPremium = settings.preferPremium && [...ytPlayer.getAvailableQualityData()].some(q => q.quality == res && q.qualityLabel.includes("Premium") && q.isPlayable);
	let useButtons = !settings.useAPI || shouldPremium;

	// Youtube doesn't return "auto" for auto, so set to make sure that auto is not set by setting
	//   even when already at target res or above, but do so without removing the buffer for this quality
	if (resolutionList.indexOf(res) < resolutionList.indexOf(currentQuality))
	{
	  const end = resolutionList.length - 1;
	  let nextBestIndex = Math.max(resolutionList.indexOf(res), 0);
	  let ytResolutions = ytPlayer.getAvailableQualityLevels();
	  debugLog("Available Resolutions: " + ytResolutions.join(", "));

	  while ( (ytResolutions.indexOf(resolutionList[nextBestIndex]) === -1) && nextBestIndex < end )
	  {
		++nextBestIndex;
	  }

	  if (!useButtons && settings.flushBuffer && currentQuality !== resolutionList[nextBestIndex])
	  {
		let id = getVideoIDFromURL(ytPlayer);
		if (id.indexOf("ERROR") === -1)
		{
		  let pos = ytPlayer.getCurrentTime();
		  ytPlayer.loadVideoById(id, pos, resolutionList[nextBestIndex]);
		}

		debugLog("ID: " + id);
	  }

	  res = resolutionList[nextBestIndex];
	}

	if (settings.useAPI)
	{
	  if (ytPlayer.setPlaybackQualityRange !== undefined)
	  {
		ytPlayer.setPlaybackQualityRange(res);
	  }
	  ytPlayer.setPlaybackQuality(res);
	  debugLog("(API) Resolution Set To: " + res);
	}
	if (useButtons)
	{
	  let resLabel = heights[resolutionList.indexOf(res)];
	  if (shouldPremium)
	  {
		resLabel = [...ytPlayer.getAvailableQualityData()].find(q => q.quality == res && q.qualityLabel.includes("Premium")).qualityLabel;
	  }

	  let settingsButton = doc.querySelector(".ytp-settings-button:not(#ScaleBtn)")[0];
	  unwrapElement(settingsButton).click();

	  let qualityMenuButton = document.evaluate('.//*[contains(text(),"Quality")]/ancestor-or-self::*[@class="ytp-menuitem-label"]', ytPlayer, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
	  unwrapElement(qualityMenuButton).click();

	  let qualityButton = document.evaluate('.//*[contains(text(),"' + heights[resolutionList.indexOf(res)] + '") and not(@class)]/ancestor::*[@class="ytp-menuitem"]', ytPlayer, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
	  unwrapElement(qualityButton).click();
	  debugLog("(Buttons) Resolution Set To: " + res);
	}
  }


  // --------------------


  // Set resolution, but only when API is ready (it should normally already be ready)
  function setResOnReady(ytPlayer, resolutionList)
  {
	if (settings.useAPI && ytPlayer.getPlaybackQuality === undefined)
	{
	  win.setTimeout(setResOnReady, 100, ytPlayer, resolutionList);
	}
	else
	{
	  let framerateUpdate = false;
	  if (settings.highFramerateTargetRes)
	  {
		let features = ytPlayer.getVideoData().video_quality_features;
		if (features)
		{
		  let isHFR = features.includes("hfr");
		  framerateUpdate = isHFR && !foundHFR;
		  foundHFR = isHFR;
		}
	  }

	  let curVid = getVideoIDFromURL(ytPlayer);
	  if ((curVid !== recentVideo) || framerateUpdate)
	  {
		recentVideo = curVid;
		setResolution(ytPlayer, resolutionList);

		let storedQuality = localStorage.getItem("yt-player-quality");
		if (!storedQuality || storedQuality.indexOf(settings.targetRes) === -1)
		{
		  let tc = Date.now(), te = tc + 2592000000;
		  localStorage.setItem("yt-player-quality","{\"data\":\"" + settings.targetRes + "\",\"expiration\":" + te + ",\"creation\":" + tc + "}");
		}
	  }
	}
  }


  // --------------------


  function setTheaterMode(ytPlayer)
  {
	debugLog("Setting Theater Mode");

	if (win.location.href.indexOf("/watch") !== -1)
	{
	  let pageManager = unwrapElement(doc.getElementsByTagName("ytd-watch-flexy")[0]);

	  if (pageManager && !pageManager.hasAttribute("theater"))
	  {
		if (settings.enableErrorScreenWorkaround)
		{
		  const styleContent = "#error-screen { z-index: 42 !important } .ytp-error { display: none !important }";

		  let errorStyle = doc.getElementById("ythdErrorWorkaroundStyleSheet");
		  if (!errorStyle)
		  {
			errorStyle = doc.createElement("style");
			errorStyle.type = "text/css";
			errorStyle.id = "ythdStyleSheet";
			errorStyle.innerHTML = styleContent;
			doc.head.appendChild(errorStyle);
		  }
		  else
		  {
			errorStyle.innerHTML = styleContent;
		  }
		}

		try
		{
			pageManager.setTheaterModeRequested(true);
			pageManager.updateTheaterModeState_(true);
			pageManager.onTheaterReduxValueUpdate(true);
			pageManager.setPlayerTheaterMode_();
			pageManager.dispatchEvent(new CustomEvent("yt-set-theater-mode-enabled", { detail: {enabled: true}, bubbles: true, cancelable: false} ));
		}
		catch {}

		let theaterButton;
		for (let i = 0; i < 3 && !pageManager.theaterValue; ++i)
		{
		  debugLog("Clicking theater button to attempt to notify redux state");
		  let theaterButton = theaterButton || unwrapElement(doc.getElementsByClassName("ytp-size-button")[0]);
		  theaterButton.click();
		}
	  }
	}
  }


  // --------------------


  function computeAndSetPlayerSize()
  {
	let height = settings.customHeight;
	if (!settings.useCustomSize)
	{
	  // don't include youtube search bar as part of the space the video can try to fit in
	  let heightOffsetEl = doc.getElementById("masthead");
	  let mastheadContainerEl = doc.getElementById("masthead-container");
	  let mastheadHeight = 50, mastheadPadding = 16;
	  if (heightOffsetEl && mastheadContainerEl)
	  {
		mastheadHeight = parseInt(win.getComputedStyle(heightOffsetEl).height, 10);
		mastheadPadding = parseInt(win.getComputedStyle(mastheadContainerEl).paddingBottom, 10) * 2;
	  }

	  let i = Math.max(resolutions.indexOf(settings.targetRes), 0);
	  height = Math.min(heights[i], win.innerHeight - (mastheadHeight + mastheadPadding));
	  height = Math.max(height, 270);
	}

	resizePlayer(height);
  }


  // --------------------


  // resize the player
  function resizePlayer(height)
  {
	debugLog("Setting video player size");

	if (setHeight === height)
	{
	  debugLog("Player size already set");
	  return;
	}

	let styleContent = "\
ytd-watch-flexy[theater]:not([fullscreen]) #player-theater-container.style-scope, \
ytd-watch-flexy[theater]:not([fullscreen]) #player-wide-container.style-scope, \
ytd-watch-flexy[theater]:not([fullscreen]) #full-bleed-container.style-scope { \
min-height: " + height + "px !important; max-height: none !important; height: " + height + "px !important }";

	let ythdStyle = doc.getElementById("ythdStyleSheet");
	if (!ythdStyle)
	{
	  ythdStyle = doc.createElement("style");
	  ythdStyle.type = "text/css";
	  ythdStyle.id = "ythdStyleSheet";
	  ythdStyle.innerHTML = styleContent;
	  doc.head.appendChild(ythdStyle);
	}
	else
	{
	  ythdStyle.innerHTML = styleContent;
	}

	setHeight = height;

	win.dispatchEvent(new Event("resize"));
  }


  // --- MAIN -----------


  function main()
  {
	let ytPlayer = doc.getElementById("movie_player") || doc.getElementsByClassName("html5-video-player")[0];
	let ytPlayerUnwrapped = unwrapElement(ytPlayer);

	if (settings.autoTheater && ytPlayerUnwrapped)
	{
	  if (settings.allowCookies && doc.cookie.indexOf("wide=1") === -1)
	  {
		doc.cookie = "wide=1; domain=.youtube.com";
	  }

	  setTheaterMode(ytPlayerUnwrapped);
	}

	if (settings.changePlayerSize && win.location.host.indexOf("youtube.com") !== -1 && win.location.host.indexOf("gaming.") === -1)
	{
	  computeAndSetPlayerSize();
	  window.addEventListener("resize", computeAndSetPlayerSize, true);
	}

	if (settings.changeResolution && settings.setResolutionEarly && ytPlayerUnwrapped)
	{
	  setResOnReady(ytPlayerUnwrapped, resolutions);
	}

	if (settings.changeResolution || settings.autoTheater)
	{
	  win.addEventListener("loadstart", function(e) {
		if (!(e.target instanceof win.HTMLMediaElement))
		{
		  return;
		}

		ytPlayer = doc.getElementById("movie_player") || doc.getElementsByClassName("html5-video-player")[0];
		ytPlayerUnwrapped = unwrapElement(ytPlayer);
		if (ytPlayerUnwrapped)
		{
		  debugLog("Loaded new video");
		  if (settings.changeResolution)
		  {
			setResOnReady(ytPlayerUnwrapped, resolutions);
		  }
		  if (settings.autoTheater)
		  {
			setTheaterMode(ytPlayerUnwrapped);
		  }
		}
	  }, true );
	}

	// This will eventually be changed to use the "once" option, but I want to keep a large range of browser support.
	win.removeEventListener("yt-navigate-finish", main, true);
  }

  async function applySettings()
  {
	if (typeof GM != 'undefined' && GM.getValue && GM.setValue)
	{
	  let settingsSaved = await GM.getValue("SettingsSaved");

	  if (settings.overwriteStoredSettings || !settingsSaved)
	  {
		Object.entries(settings).forEach(([k,v]) => GM.setValue(k, v));

		await GM.setValue("SettingsSaved", true);
	  }
	  else
	  {
		await Promise.all(
		  Object.keys(settings).map(k => { let newval = GM.getValue(k); return newval.then(v => [k,v]); })
		).then((c) => c.forEach(([nk,nv]) => {
		  if (settings[nk] !== null && nk !== "overwriteStoredSettings")
		  {
			settings[nk] = nv;
		  }
		}));
	  }

	  debugLog(Object.entries(settings).map(([k,v]) => k + " | " + v).join(", "));
	}
  }

  applySettings().then(() => {
	main();
	// Youtube doesn't load the page immediately in new version so you can watch before waiting for page load
	// But we can only set resolution until the page finishes loading
	win.addEventListener("yt-navigate-finish", main, true);
  });
})();

Hello I have a request for this brilliant script. Please consider adding an option to disable autoplay, not for the next video, but to prevent the video from starting when the tab is loaded. Currently, when a YouTube video is opened in a new tab, it automatically starts playing upon switching to that tab. I would like the video player to continue buffering but not play the video until I click play. Thank you

Firefox can already disable autoplay of audio and video:

Regarding 1080p Premium, i'm also seeing the same issue.

it's not being selected even thought it's set: preferPremium: true,