RTMP support

[Riccardo Arena]

Hi everybody,
i started today developing a QT4 application, using gstreamer as
backend for Phonon.
The application will play a rtmp stream from a red5 server.
I installed the rtmp plugin from the bad repository (gst-plugins-rtmp).
In qt, i created a simple Phonon::VideoPlayer, set it's source to
rtmp://localhost/oflaDemo/prometheus.mp4.

The VideoPlayer then starts playing only the audio channel. How can i
make it play the video too?

Thanks and sorry for the dumb question.