[YouTube-API] query string format=5

I am sending this code to get only embedded format for web..however i am still getting back from the server the RTSP urls.

Uri videoquery = new Uri("http://gdata.youtube.com/feeds/api/standardfeeds/US/top_rated_Comedy?format=5");

 Feed<Video> video = req.Get<Video>(videoquery);

any help in understanding why is not filtering...newbie to youtube development, thanks

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