How to get the original YouTube video link?

Question

YouTube

How to get the original YouTube video link, similar to many video download services. After a bit of searching, I found several articles:

• stackoverflow
  
• Habr
  

The first one even contains JavaScript code, but when I started writing something similar, I ran into some problems:

1. Multiple hits to ' https://www.youtube.com/get_video_info?video_id={V... return differently structured information. For example: On the first visit On the second visit Do not say that this is a problem, because the links are still there.
   
2. Due to the incomprehensible (to me) structure of this information, I can’t figure out how I can still correctly break down all the information and, suppose, create an array VIDEO_RESOLUTION => LINK_TO_CORRESPONDING FORMAT
   

And finally, a draft implementation that occasionally works

$config = urldecode(file_get_contents('https://www.youtube.com/get_video_info?video_id='.$id));
  $end = array();

  echo '<pre>';

  foreach ( explode('&', $config) as $key => $value ) 
  {
    array_push( $end, explode( '=', $value ) );
  }

  foreach ( $end as $el ) 
  {
    if( $el[0] == 'url' )
      echo '<a href="'.urldecode($el[1]).'">'.urldecode($el[1]).'</a><br>';
  }

Answer 1

Why bother if there is youtube-dl
Actually, you call youtube-dl from php and get an array of links. I immediately warn you that the links to the videos are in quality up to 720p. For higher quality, you will need to merge the video and audio track, because. they go separately. (ffmpeg to the rescue)