Already you're probally wondering how I got 60fps on Youtube.
The way to do it, is to use the HTML5 player, and set the video speed to 2x, if the video is slowed down by 50% (like this example).
The only problem with this is the audio, sounds not that great.
If you're confused, if you didn't know, Youtube only allows 30fps video to be uploaded. This is probally the best way to get smooth video.
Not good audio though.Example is here:
60fpsEdit: I'm not sure if this is the right place. Please tell me if this topic isn't.