var youtubedl = require('youtube-dl');
var dl = youtubedl.download('http://www.youtube.com/watch?v=90AiXO1pAiA',
  './videos',
  // optional arguments passed to youtube-dl
  ['--max-quality=18']);

// will be called when the download starts
dl.on('download', function(data) {
  console.log('Download started');
  console.log('filename: ' + data.filename);
  console.log('size: ' + data.size);
});

// will be called during download progress of a video
dl.on('progress', function(data) {
  process.stdout.write(data.eta + ' ' + data.percent + '% at ' + data.speed + '\r');
});

// catches any errors
dl.on('error', function(err) {
  throw err;
});

// called when youtube-dl finishes
dl.on('end', function(data) {
  console.log('\nDownload finished!');
  console.log('ID:', data.id);
  console.log('Filename:', data.filename);
  console.log('Size:', data.size);
  console.log('Time Taken:', data.timeTaken);
  console.log('Time Taken in ms:', + data.timeTakenms);
  console.log('Average Speed:', data.averageSpeed);
  console.log('Average Speed in Bytes:', data.averageSpeedBytes);
});

var youtubedl = require('youtube-dl');
var url = 'http://www.youtube.com/watch?v=WKsjaOqDXgg';
// optional arguments passed to youtube-dl
var options = ['--username=user', '--password=hunter2'];
youtubedl.getInfo(url, options, function(err, info) {
  if (err) throw err;

  console.log('id:', info.id);
  console.log('title:', info.title);
  console.log('url:', info.url);
  console.log('thumbnail:', info.thumbnail);
  console.log('description:', info.description);
  console.log('filename:', info.filename);
  console.log('itag:', info.itag);
  console.log('resolution:', info.resolution);
});

var youtubedl = require('youtube-dl');
var url = 'http://www.youtube.com/watch?v=WKsjaOqDXgg';
youtubedl.getFormats(url, function(err, formats) {
  if (err) throw er;

  formats.forEach(function(format) {
    console.log(format);
  });
});