F4V Stream don't play on iOS devices

I'm trying to play a recorded stream from flash media server on mobile devices. I'm able to play FLV files but F4V files (like the sample files included in the VOD application in FMS)  won't play on iOS device (tested on iPad 1 and iPhone 4s).

The odd part is that this videos play fine in the simulators included in Flash Builder 4.6 and also in Android devices and BlackBerry Playbook.

FLV videos play fine in all devices and simulators.

Updating Air SDK to 3.4 didn't solve the problem.

I tried with Flash Builder 4.7 and didn't solve it neither.

Source:

....

protected var nc:NetConnection = new NetConnection();

protected var ns:NetStream;

protected function application1_creationCompleteHandler(event:FlexEvent):void

{

     nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);

     nc.connect("rtmp://server-url:port/application/instance/");

}

protected function onNetStatus(event:NetStatusEvent):void

{

     if(event.info.code == "NetConnection.Connect.Success"){

          ns = new NetStream(nc);

          ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStreamStatus);

          ns.client = this;

          ns.play("mp4:folder/sample1_1000kbps.f4v");

          var video:Video = new Video();

          video.attachNetStream(ns);

          container.addChild(video);

     }

}

......

Events received from simulator:

     NetConnection.Connect.Success

     NetStream.Play.Reset

     NetStream.Play.Start

     NetStream.Buffer.Full

     NetStream.Video.DimensionChange  <--- Video playing

Events received from iOS device:

     NetConnection.Connect.Success

     NetStream.Play.Reset

     NetStream.Play.Start

     NetStream.Buffer.Full <-- Stuck, no video, no audio

Anyone has any idea? Why the f4v streams are not playing on iOS devices?

Regards