[ubuntu] HOW to make 720 and 1080 p work on Youtube with Ubuntu ?

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http://ubuntuforums.org – they always drag for me and do not work 480p is the highest format that will play smoothly so far how can i change this? i can play 1080p videos on smplayer fine and up to 720 on VLC but on YT i am in the "Middle Ages" how are others doing here? (Hardware)