var video:Video = new Video(VIDEOWIDTH, VIDEOHEIGHT);
addChild(video);

var nc:NetConnection = new NetConnection();
nc.connect(null);

var ns:NetStream = new NetStream(nc);
ns.addEventListener(NetStatusEvent.NET_STATUS, onStatusEvent);

function onStatusEvent(stat:Object):void
{
	trace(stat.info.code);
}

var meta:Object = new Object();
meta.onMetaData = function(meta:Object)
{
	trace(meta.duration);
}

ns.client = meta;

video.attachNetStream(ns);

ns.play("yoursource.flv");

Flash NetConnection

flash, video

ActionScript 3