YouTube 3GP link (mobile development)

Question

Hey all!

Trying to develop a mobile website. Right now, I'm using the following link to play a YouTube video, however, it requires the YouTube app to be installed on the phone (iPhone, Android, Blackberry, etc.):

http://www.youtube.com/v/videoID

However, some devices support RTSP natively (without the YouTube app), so, I'd like to do so. However, when I try using an example RTSP link (available by going to the mobile YouTube and right clicking on the Watch Video/thumbnail link):

rtsp://v6.cache8.c.youtube.com/Ck0LENy73wIaRAnS3qIRHttGWBMYEiASFEIJbXYtZ29vZ2xlSARSDGFkZF9mYXZvcml0ZVoOQ2xpY2tUaHVtYm5haWxgo6bd5re19I9MDA==/0/0/0/video.3gp

The video player will open (Android, Blackberry), but the video doesn't play.

Any ideas why?

Thanks all!