You can download mp4 files directly from Youtube. I've found a way to download videos right from the domain googlevideo.com . No 3rd party tools, any requested clarity.
I thought I'll make a post to explain this easy method, then realized Google would take down that method within a week, so I'm keeping quiet.
Well that's sort of what youtube-dl does, no? Except for you don't have to inspect network tab or merge anything manually, and you can choose quality and download playlists etc.
I'm not gaining anything from your assurance. I've found the best way - A first party method. No shady downloaders, extensions. I'm going to keep using it.
I thought I'll make a post to explain this easy method, then realized Google would take down that method within a week, so I'm keeping quiet.