As I have mentioned before, but feel it bears repeating, I added on to my Firefox browser the free "Easy Youtube Video Downloader" extension: https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/
It creates a green "Download" button beneath every video you visit. You can then download any video to your PC (then to a thumb drive to watch on your TV via a USB drive on your DVD player or what-not) to watch at your leisure, away from your PC, add-free (without commercial interruptions).
I have saved hundreds of videos (such as music concerts and records LPs/songs, documentaries, etc) for some years now.
I really like the sound of this...being able to watch ad-free and to save for later viewing on TV. But I wonder what are the potential consequences, given this (from the Techradar site):
Is downloading YouTube videos legal?
Before you use a free YouTube downloader, bear in mind that using third-party apps to download videos is against YouTube's terms of service, which say you can only stream videos directly from its servers. Downloading videos is also a potential copyright infringement unless you own the video yourself, have permission from the copyright holder, or it's in the public domain.