Why does my video have to load completly to start playing? Created Sep 1, 2010

My problem is: a video has to finish buffering (100%) to start playing and i can't force it to start... so i have to wait a very long time to start watching it.
Also the progress isn't shown in the timeline.

I have tryed to set the bufferlength to 2, but no reaction.

Is it possible that the problem is related with the .mp4 - format?

My Flowplayer Versions:
flowplayer.controls-3.2.2.swf
flowplayer-3.2.4.swf

$f("video_player", swfplayer, {
 playlist : [
  {
   //Ajax - JSON Response - response.video.value
   url: response.video.poster[0], 
   scaling: 'orig'
  },
  {
   url:response.video.url[0]+'.mp4',
   autoPlay: autoplay_video,
   autoBuffering: autobuffer_video,
   bufferLength:2
  },
  {
   url: response.video.poster[0], 
   scaling: 'orig'
  }
 ],
 plugins: {
  controls:  {
   url: swfcontrol,
   progressColor: '#05a1dc',
   bufferColor: '#727676',
   buttonColor: '#ffffff',
   buttonOverColor: '#04a1db',
   backgroundColor: '#313a3e',
   backgroundGradient: 'high',
   background: 'rgba(82,101,107,0.8)',
   all:false,
   fullscreen:true,
   scrubber:true,
   volume:true,
   mute:true,
   play:true,
   height:30,
   autoHide: 'always'		
  }
 }
});

$f("video_player").load();