Re: [MMUSIC] RTSP multicast question.

[Rémi Denis-Courmont <rem at videolan.org>]

Le lundi 4 août 2008 17:47:17 Magnus Westerlund, vous avez écrit :
> Rémi Denis-Courmont skrev:
> > On Thursday 31 July 2008 21:05:49 ext Yedidia Amit, you wrote:
> >> Thank you for your detaild answers, but I think you missed the point.
> >>
> >> I am using RTSP as media configuration delivery mechanism, as Magnus
> >> wrote, since I want to be able to use standard clients (QuickTime, VLC)
> >> I want than no changes should be done at the client side (otherwise I
> >> would developed a full proprietary protocol).
> >
> > If you put a multicast address in the c= line(s) and proper (non-zero)
> > port numbers in the m= line(s), VLC will try to setup the media using
> > multicast, as normal (DESCRIBE, SETUP, PLAY...). I assume Quicktime does
> > the same.
>
> In other words request that the streaming sever deliver media to the
> specified multicast group?

Yes. At least, that's how I recall Live555 RTSP stack works (that being the 
RTSP client stack in VLC at the moment). In yet other words, the server 
(configuration) decides whether and to which group to send multicast to.

In theory, I suppose RTSP client could just try to setup multicast by default, 
and fallback to unicast... but that involve the client agent "computing" 
an "appropriate" multicast group, whatever that means. Sounds brittle :(

-- 
Rémi Denis-Courmont
http://www.remlab.net/
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