How to add AIR SDK 3.7 to Flash Professional CC

I don't have any issues with playing MP4. You must understand that mp4 should meet MP4 format requirements. If your video can't be played - this may be caused by issues with that mp4 video file but not Adobe Air.

For example this AS3 code succesfully play mp4 video that meet mp4 requirements by format (not Adobe whimsy). Also you may note that StageVideo available on Direct render mode. Auto or CPU will not support native mp4 playing.

package  {
    import flash.display.Sprite;
    import flash.net.NetConnection;
    import flash.net.NetStream;
    import flash.media.StageVideo;
    import flash.geom.Rectangle;
    public class sv extends Sprite {
        private var nc : NetConnection;
        private var ns : NetStream;
        private var client : Object = {};
        private var StageVideoContainer : StageVideo;
        public function sv() {
            client.onMetaData = onMetaDataCallback;
            nc = new NetConnection();
            nc.connect(null);
            ns = new NetStream(nc);
            ns.client = client;
            StageVideoContainer = stage.stageVideos[0];
            StageVideoContainer.attachNetStream( ns );
            StageVideoContainer.viewPort = new Rectangle(0,0,stage.stageWidth,stage.stageHeight);
            ns.play("162447510.mp4");
        }
        private function onMetaDataCallback(e:Object):void{
        }
    }
}

Here is Windows 7 Adobe Air project config from Flash CC. MP4 works prefect!

In this sample app I use Adobr Air 4.0.0.1390 from latest official release. You can chat to my skype therabbitwindfall and I will support you with my mp4 and Win7 project.

P.S. this mp4 works fine on iOS also.