Progressive dwnld FLV getting audio only

Help! I’m using the below code and the result is that the .FLV does start downloading and playing as it should, except that I get only sound, no video.


this.attachMovie("msgVideo", "MsgVideo", 1);
var ncConnection:NetConnection = new NetConnection();
ncConnection.connect(null);
var nsStream:NetStream = new NetStream(ncConnection);
MsgVideo.attachVideo(nsStream);
nsStream.play("0521061.flv");

Can anyone tell me what I"m doing wrong?