Sound works but no picture

Hi.

Am I doing something wrong. I can't get a picture . All the channels show up and audio plays fine. Just Can't get video.

I am running openelec 3.06 xbmc build on raspberry pi.
USB tuner is hauppauge winTV mini stick Siano Mobile Digital MDTV Receiver.
Thx so much.

did you buy the additional codecs for the pi? you'll need those

Thx. Yes I eventually found another post mentioning that. Just waiting on the key.