PB preloading swf containing stream video AS


it seems i have problems to preload my swf documents containing
embed streaming video (flv)(netStream object, no components).
THe prelaod MC bar keeps on loading again and again without
going to image 2.

Here is the simple code i use with preload bar:

onClipEvent (enterFrame) {
 this.preload() ;

and the code on the action layer (image 1):

movieClip.prototype.preload = function() {
 this.Total = _root.getBytesTotal();
 this.Charge = _root.getBytesLoaded();
 this.rapport = Math.round((this.Charge)/(this.Total)*100);
 _root.progression = Math.round(this.rapport)+" %";
 if (this.rapport == 100) {

This code works with every other type of documents,
so i wonder if there is not a conflict with embed video AS somewhere…
Can someone help here?