Video in Flash

[font=Arial]Hello, firstly im new to the forum so hello to everyone.
I am pretty new to flash but am slowly getting to grips with it and have started to have a play with using video.

Basically I have an flv file which I have linked to using mediaPlayback, I have checked the ‘automatically play’ button and uploaded to my web space.
All works great apart from the video starts playing back a bit to early and catches up with the download before it hits the end.
Is there any way I can control the auto playback to only start once say 40% off the movie is buffered? or do I need to looking into a proper streaming server to do this?

Any help greatly appreciated