[Reijii]

можно попробовать так, из хелпа выдержка:

import mx.video.*;
my_FLVPlybk.contentPath = "http://www.helpexamples.com/flash/video/no_such.flv";
var listenerObject:Object = new Object();
listenerObject.stateChange = function(eventObject:Object):Void {
    if(my_FLVPlybk.state == FLVPlayback.CONNECTION_ERROR)
        trace("State: " + FLVPlayback.CONNECTION_ERROR);
}
my_FLVPlybk.addEventListener("stateChange", listenerObject);