You can try create your custom NetConnectionFactory and override the createNetConnection function:
protected function createNetConnection():NetConnection
return new NetConnection();
Is this helpful?
I'm not sure that would do the trick. What is required is are 2 extra parameters, a boolean to declare if you are passing the mulricastResource an existing RTMFP object or not, and a parameter for an existing RTMFP group if there is one.
These parameters should be added to the existing MulticastResource constructor
True if you are passing an already existing one - and if you are there is the requisite param to receive it.
I've been peering into the innards of the player _ think I see why you
suggested the creation of a custom NetConnectionFactory. I'll give that
a shot - time to tinker