Video length problem

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im having small problem, trying build video controls in application, creating playhead using hslider.

my video defined
=====
<mx:videodisplay autoplay="false" id="video" live="false" >
<mx:source>...source....</mx:source>
<mx:volume>.75</mx:volume>
<mx:playheadupdateinterval >25</mx:playheadupdateinterval>
</mx:videodisplay>
====


and slider
====
<mx:hslider maximum="{video.totaltime}" enabled="true" change="setvideo(event)" id="playhead" allowtrackclick="true" value="{video.playheadtime}" >
====

the function used
=====

private function setvideo(event:sliderevent):void {
var currentslider:slider=slider(event.currenttarget);
video.playheadtime=currentslider.value;
}
=====
the problem totaltime loads immediately, waits video play through. causes slider max nan, removing functionality.

is there better method creating playhead? files flvs on http, not live.
thanks help



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