I treat youtube-dl like Fight Club. I am glad it isn't on the top of searches since I am afraid sites would start trying to stop it from working harder.
I don't know what parent is talking about, this script it's already very popular. I found it years ago and it wasn't difficult to find on google. Something worth mentioning is that the script works with dozens and dozens of video sites (or just sites with regular video content). Almost any video you throw at it gets downloaded. When something breaks it's usually fixed within days. It's a great piece of work.