Can not play rtsp stream from Youtube

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http://stackoverflow.com – i'm trying since a few days to play Youtube rtsp streams in my Android app, but only get Errors from Android MediaPlayer instance - unable to open file. I've tried to open 3gp files, it can play. Tried to open other rtsp streams found around the internet - all can play, but Youtube dont. Tested the video urls in Windows VLC player - the player cant play a YOutube video streamed with rtsp protocol. Is there something wrong with YT rtsp streams so no player can play that Urls? Thanks for a small hint what can i try to do ;) (HowTos)