as3 I need to play mp4 video! I use FileReference (ByteArray)

This code do not work:

data - ByteArray

var nc:NetConnection;

                              var ns:NetStream;

ns.appendBytes(data);

nc=new NetConnection();

                                        nc.connect(null);

                                        ns=new NetStream(nc);

                                        var video:Video = new Video();

                                        video.attachNetStream(ns);

                                        ns.play(null);    

addChild(video);

Help me!