Netstream load start from middle of a video

I’m using the netstream and video object to play a video in flash.

What I’m trying to do is start playing the file from a specific position (Ex. 620seconds).

However with netstreamObject.seek(620) doesn’t work unless the stream has been loaded past 620seconds. Is there a way to specify starting to load at 620s? Or any other way of accomplishing this?