Flv time countdown

I’m trying to figure out how to get the time remaining of an flv.

I currently can get the total time and the current time. Any ideas?


var totalHours:Number;
var totalMinutes:Number;
var totalSeconds:Number;
var hours:Number;
var minutes:Number;
var seconds:Number;

function videoStatus() {
   totalHours = Math.floor(duration/3600);
   totalMinutes = Math.floor(duration/60)-(totalHours*60);
   totalSeconds = Math.round(duration%60);
   hours = Math.floor(netS.time/3600);
   minutes = Math.floor(netS.time/60)-(hours*60);
   seconds = Math.round(netS.time%60);

   trace(totalHours + " hours: " + totalMinutes + " minutes: " + totalSeconds +" seconds");
   trace(hours + " hours: " + minutes + " minutes: " + seconds +" seconds");
}