interactive mobile TV

I want to have a J2ME application that displays a live streamed video, 
text and some buttons. The textual infos and button actions have to be 
synchronized with the live video stream. One use case is a tv shopping 
channel. My current issue is to synchronize the video with the text and 
button actions. First I tried to get the meta data I had embedded in the 
RealMedia stream (using RMEvents tool and slta play lists). But 
MetaDataController interface is not implemented on my N70. I found no 
other Nokia platform that supports that interface. Therefor I tried to 
use MediaTime (player.getMediaTime()). That seemed to be a good solution 
until I found out that the MediaTime is not synchronized with the 
current frames the user sees on his phone display. The MediaTime on my 
phone is always 3-6 seconds ahead. This is at least my biggest problem. 
I found no way to determine the amount of time that the MediaTime is ahead.

Because of the MediaTime based problem I started to think about parsing 
the rtsp stream to extract MetaData from the video stream on my own. Has 
anyone tried that successful?

Has anyone similar experiences? Any alternative ideas or a solution?

cheers,
Michael

my enviroment:
- S602ndFP3 based Nokia N70 phone
- Real Universal Server with mobile option