Is there a package I should install to use xine embedded in other applications?

[Marcelo Magno T. Sales]

People,

I have xine installed in Kubuntu 9.10 and can use it to successfully 
reproduce any kind of video I have here. However, Kaffeine, Dragon 
Player and Gwenview, which use xine to play videos, are unable to 
reproduce the very same videos I can play using xine directly.
They show a progress bar as if they were playing the videos, but no 
sound is heard and no video is displayed.
Is there a package I should install to be able to use xine embedded in 
these other applications?

Thanks,

Marcelo