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Last updated: April 2021

Also known as itag or format codes and way back they could be specified with the fmt parameter (e.g. &fmt=22). Depending on the age and/or popularity of the video, not all formats will be available.

DASH video

Resolution	AV1 HFR High	AV1 HFR	AV1	VP9.2 HDR HFR	VP9 HFR	VP9	H.264 HFR	H.264
	MP4	MP4	MP4	WebM	WebM	WebM	MP4	MP4

Full socket.io client and server example

Last updated: 2021-02-21, tested with socket.io v3.1.1

This is the simplest implementation you will find for a client/server WebSockets architecture using socket.io.

To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.

If you're looking for examples using frameworks, check these links:

	/**
	* JS scoping, and this property resolutions rules in ES7/ES8.
	*
	* Quiz: x is gone, and x is everywhere!
	*
	* Help find Xs! What's the output?
	*/

	let x = 1;

	/**
	* @author ebidel@ (Eric Bidelman)
	* License Apache-2.0
	*
	* Shows how to use Puppeeteer's code coverage API to measure CSS/JS coverage across
	* different points of time during loading. Great for determining if a lazy loading strategy
	* is paying off or working correctly.
	*
	* Install:
	* npm i puppeteer chalk cli-table

	#!/bin/bash
	# Referenced and tweaked from http://stackoverflow.com/questions/6174220/parse-url-in-shell-script#6174447

	proto="$(echo $1 \| grep :// \| sed -e's,^\(.://\).,\1,g')"
	# remove the protocol
	url="$(echo ${1/$proto/})"
	# extract the user (if any)
	userpass="$(echo $url \| grep @ \| cut -d@ -f1)"
	pass="$(echo $userpass \| grep : \| cut -d: -f2)"
	if [ -n "$pass" ]; then

	"use strict";

	// [run the app]
	// $ npm install electron
	// $ ./node_modules/.bin/electron .

	const {app, nativeImage, Tray, Menu, BrowserWindow} = require("electron");

	let top = {}; // prevent gc to keep windows

	// Express
	const express = require('express');
	const bodyParser = require('body-parser');
	const path = require('path');

	const PORT = 9000;

	const STATIC = path.resolve(__dirname, 'dist');
	const INDEX = path.resolve(STATIC, 'index.html');

	module.exports = function atob(a) {
	return new Buffer(a, 'base64').toString('binary');
	};

	const command = ffmpeg()
	const commandArray = []
	command.addInput(`./best.mp4`)
	command.addInput(`./best2.wav`)
	commandArray.push(`[1]volume=0.1[a1]`)
	command.addInput(`./voiceover.mp3`)
	commandArray.push(`[2]volume=0.9[a2]`)
	let ffmpegKeys = '[a1][a2]amix=inputs=2[a]'

	commandArray.push(ffmpegKeys)