[mythtv-users] Multicast IPTV problems (TPG, Aus)

Jon Whitear jon at whitear.org
Tue Jun 2 00:58:09 UTC 2009


> I have a separate BE/FE setup running 0.21-fixes. I’m trying to get  
> IPTV working (using multicast IPTV provided by my ISP – TPG in Sydne 
> y, Australia.) I have set up a Freebox input and a source OK – the p 
> roblem seems to be a low level multicast issue on my backend box.

>
> When I select an IPTV channel in Live TV on my front end, it appears  
> to try to ‘tune’ the channel, but eventually times out, saying I  
> “should have got a lock by now.” TCPdump on the backend shows no  
> multicast traffic flowing.
>
>
>
> However, if I tune to and start watching the same channel using VLC  
> on my Macbook (on the same network), and then select that channel in  
> Live TV on my front end, it works just fine, and TCPdump shows the  
> multicast traffic at the backend.
>
>
>
> That suggests to me that for some reason my backend is failing to  
> join the multicast group properly. I have a Netgear gigabit switch  
> that both the backend and frontend are patched to. The Macbook is  
> wireless via a Cisco AP connected to the same switch. I assume that  
> the switch isn’t smart enough to do any IGMP snooping or other multi 
> cast smarts, in which case once my Mac has joined the stream, the mu 
> lticast packets would get sent to the backend.
>
>
>
> I’d be grateful for any pointers on how I may go about troubleshooti 
> ng and resolving the issue. FYI, the backend’s running reasonably up 
>  to date Gentoo with a 2.6.28 kernel, and the frontend is (again, up 
>  to date) Mythbuntu 8.04.
>
>
>
> Thanks in advance,
>
>
>
>
>
> Jon
>


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