The youtube started using VP9 videos codec recently as it is more efficient in streaming videos.But the problem we face is we can't play VP9 videos on normal players.But the latest version of VLC media player can play it like any other normal videos.It's just 28MB and plays everything.The KMPlayer seems like it is not so much good as it was about a year ago. #1.Download VLC media player from www.videolan.org #2.Install it and set it default for every video file type. #3.Drag and drop or open your video which was downloaded using Internet Download Manager. #4.Enjoy!