mediaPlayback component problems when using netStream class

I am using the mediaPlayback component to play external .flv files. First problem I had was that they were stopping intermittently when loaded to the server… so I read up on the netStream class and attached this basic code…

var netConn:NetConnection = new NetConnection();
netConn.connect(null);
var netStream:NetStream = new NetStream(netConn);
//my_video is the name of the component instance on the stage
my_video.attachVideo(netStream);
netStream.setBufferTime(20);
netStream.play(“introDemo.flv”);

Now… the audio plays but no video plays and the controls on the component do not work now… ie… can’t pause it. or adjust the volume.