A very long time ago, I've worked on a Perl script to do just that ( https://www.perlmonks.org/?node_id=636777 https://www.perlmonks.org/?node_id=636777 ). Of c

A very long time ago, I've worked on a Perl script to do just that ( https://www.perlmonks.org/?node_id=636777 https://www.perlmonks.org/?node_id=636777 ). Of course the problem with this sort of scripts is that they keep chasing behind changes youtube makes precisely to prevent video downloading.