This question already has an answer here:
Sites were you put in a youtube url, then it goes and gives you an mp4 or mp3 of the video.
How does that work?
Viewing the source of a youtube page gives me:
<video class="video-stream html5-main-video" x-webkit-airplay="allow" data-youtube-id="q9ioaNWaqtw" src="blob:http%3A//www.youtube.com/9a45c6e4-df42-4e8b-9fb3-43a78cccebf3" style="width: 640px; height: 360px; left: 0px; top: 0px; -webkit-transform: none;"></video>
Just going to the
src gives you nothing. As an answer, oliver says you can just "simply download them directly". How do those sites do that?
I'm planning to make one. What pieces of information, specifically, should I be targeting?
Is there any sort of open source youtube downloader I can take a look at?