So lately I've been having problems downloading some videos from Youtube such as this one:
https://www.youtube.com/watch?v=xouo8ktxZNc
I've tried KeepVid, DownloadHelper, a Greasemonkey script and youtube-dl, and only youtube-dl worked. I've noticed this problem with KeepVid for some months. And at the same time they download other videos completely fine.
So does anyone know why those download managers don't work? I doubt it's because Youtube changes protocolsYoutube changes protocols since for some videos it still works and has worked all the time.