multicast and unicast alternative

[martintxo]

Hello.
I want to do the following, if possible: I have a multicast stream from a VLC working as a server, and I have a web page from where a client can access the stream.
Now, I have a script that makes a telnet communication to this server and creates an VLM channel to receive a unicast stream.
The problem: a client who wants to see our stream can be multicast capable or not. If so, our page would take the multicast stream and all works fine. If not, the script would execute and a unicast stream would be generated from server to the client.
Is there any way, or any VLC signal that I could use to "automatically" know if the client VLC is receiving packets from my multicast address, or if after a time I can suppose that no such packet will be received?