Of course, The next thing is to watch your downloaded videos offline.
Anyway, What did you noticed? The format is flv or Mp4...
How to play the video through Windows Media Player, Windows Media Center, WinAmp, VLC, Media Player Classic and other famous video player.
For more compatibility in playing the video, I recommend to install K-lite codec pack. After installing the package, you can now watch the video in any video application, including Windows Media Player. Also, the good thing is that Media player classic is included. It is a light-weight video player application.Download 4
VLC is a portable multimedia player for various types or formats of video. Just Download the application and open the youtube video through this player. That's it!