[streaming] Re: WMV & Multicast for Internet

[Marshall Eubanks]

Hello;

1.) Multicast addresses are the _destination_ address, not the  
_source_ address for multicasts. I.e.,
to send multicasts, in most systems it suffices to pick UDP and put  
in a multicast address
as the destination address. (My reading of the original post was that  
he thought that
the  multicast address was assigned in some  fashion to the  source,  
as a secondary
source IP address, which it isn't.)

2.) Of the 224/4 multicast range that Viktor mentions below, most has  
been assigned by IANA for
various purposes or are reserved. PLEASE do NOT pick a multicast  
address at random from
the 224.0.0.0-239.255.255.255 range.

3.) The 239/8 range has been assigned for site  and network local  
addresses, which  need no coordination except
with the local network administrator. In other words, the range  
239.0.0.0 to 239.255.255.255 is analogous for multicast to the 10 / 8  
(i.e., 10.0.0.0 to 10.255.255.255) range used for RFC1918 NAT's -  
just pick one.

4.) If you want to have a globally routable multicast address, the  
best bet is to use  "GLOP" space
in 233/8. This is covered in the multicast faq file

http://www.multicasttech.com/faq/

Regards
Marshall Eubanks

On Nov 25, 2005, at 3:54 AM, Viktor Kompaneyets wrote:

> Steit Slings wrote:
>
>> Hai Rafa,
>>
>> You do not need a multicast IP for wmv. The problem is in your config
>> 1) acodec should be mp3 for windows media
>> 2) url ahould be the IP number of the network card, now your  
>> listening on
>> the localhost. You sould do url=:1234 to listen on ALL IP's for your
>> computer,
>> Furthermore with this statement your are not sending out, the  
>> client needs
>> to collect the stream from your server using mms://your.ip.number: 
>> 1234/
>
> Partially wrong. For multicast You need to select as mcast-addr  
> adress in
> range 224.0.0.0-239.255.255.255. Adresses in 224.0.0.0-225.0.0.0  
> can be
> assigned only if You have network without routers. Reserved  
> addresses are
> described in RFC, or you can read this article:
> http://www.linuxfocus.org/English/January2001/article144.shtml
>
> So if you stream to mcast you should set as output URL something  
> like this:
> {acodec=mp3, vcodec=WMV2,mux=asf,url=225.0.0.1:1234}
>
> So on the player you should open stream as: mms://225.0.0.1:1234
> Check, if on both sides is mcast-routing is set for network  
> 224.0.0.0/4 on
> the interface, which is envolved in multicast.
>
>
> -- 
> Viktor Kompaneyets
> Wnet project manager
>
> -- 
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