How to detect webcam streams without receiving ones

Question

Hi!
I am looking a way to know when user(any user in the room/group) started to publish his webcam and stopped.
I've tried to add listener to StreamManager
            protected function cameraview_initializeHandler(event:FlexEvent):void{
                this._connectionSession.streamManager.addEventListener(StreamEvent.STREAM_RECEIVE, this.streamReceivedHandler);
            protected function streamReceivedHandler(event:StreamEvent):void{
               trace('stream received', event.name, event.streamDescriptor.groupName, event.streamDescriptor.streamPublisherID);
And STREAM_RECEIVE called when another user started to publish, but event has groupName=null and streamPublisherID is NULL too.
I need this to give posibility to choose streams needed to play and lower bandwith.
I've tried to use WebcamSubsriber too, but it starts to display stream right when it is received.
What have i missed?

Answer 1

Oh ok. If you do not by default want to see the other user's stream, you should set initially the publisherIDs property in the WebcamSubscriber to an empty array( not just leave it as by default, it shows every stream). Now, let's say when you get a stream from an user by listening to StreamManager's STREAM_RECEIVE , then you would have to assign publisherIDs array to have that publisherID of the stream that you want to see and it will start showing that user's stream. You need to listen to StreamManager ( and not subscriber) in this case because the subscriber won't know beforehand whether it has to show that stream and won't dispatch the STREAM_RECEIVE event.
Thanks
Regards
Hironmay Basu