notify flash tech of duration change for UI ramifications

@@ -408,6 +408,12 @@ var
 
         // update the duration
         player.duration(totalDuration(player.hls.media));
+        // tell the flash tech of the new duration
+        if(player.el().querySelector('.vjs-tech').id === 'video_flash_api') {
+          player.el().querySelector('.vjs-tech').vjs_setProperty('duration', player.duration());
+        }
+        // manually fire the duration change
+        player.trigger('durationchange');
       }
     };