[Icecast] fallback in Icecast 2.3 RC3

Karl Heyes karl at xiph.org
Mon Sep 19 15:59:07 PDT 2005


On Mon, 2005-09-19 at 21:43, Milos Wimmer wrote:

> > If there's no fallback link from /cro-region-256.ogg to
> > /z-cro-region.ogg then it's wrong, but I'd prefer to see the xml and
> > error log (level 4) before saying it's a bug.  If there is a fallback
> > from /cro-region-256.ogg to /cro-region.ogg with override enabled then
> > it could happen.
> 
> I would like to have fallback from /cro-region-256.ogg to 
> /z-cro-region.ogg. But when I had it, it worked exactly same. So I tried 
> remove it for simpler description.
> On other side - why is wrong to have /cro-region-256.ogg without fallback?
> I'm running lot of other streams on that icecast server and some of them 
> have no fallback.

your xml has

    <mount>
            <mount-name>/cro-region-256.ogg</mount-name>
            <fallback-mount>/z-cro-region.ogg</fallback-mount>
            <fallback-override>1</fallback-override>
    </mount>

so if your listeners have fallen back to /z-cro-region.ogg and
/cro-region-256 reconnects then the listeners will be moved to that
mountpoint.

If you want to have the same fallback to 2 or more sources but maintain
the original mountpoint for where they came from then fallback to a
mountpoint which is a local relay of the fallback stream.

eg

    <relay>
            <server>127.0.0.1</server>
	    <port>8000</port>
	    <mount>/z-cro-region.ogg</mount>
	    <local-mount>/fall-cro-region.ogg</local-mount>
    </relay>

    <relay>
            <server>127.0.0.1</server>
	    <port>8000</port>
	    <mount>/z-cro-region.ogg</mount>
	    <local-mount>/fall-cro-region-256.ogg</local-mount>
    </relay>

    <mount>
            <mount-name>/cro-region.ogg</mount-name>
            <fallback-mount>/fall-cro-region.ogg</fallback-mount>
            <fallback-override>1</fallback-override>
    </mount>

    <mount>
            <mount-name>/cro-region-256.ogg</mount-name>
            <fallback-mount>/fall-cro-region-256.ogg</fallback-mount>
            <fallback-override>1</fallback-override>
    </mount>


                        fallback
/cro-region.ogg -----------------------> /fall-cro-region.ogg
						A
						| relay
						|
                                         /z-cro-region.ogg
						|
						| relay
                        fallback		V
/cro-region-256.ogg -------------------> /fall-cro-region-256.ogg


The idea is that actual listeners will never be on /z-cro-region.ogg,
the 2 relays will have the same contents but will isolate the listeners.
For this you will need 2 mountpoints for each listener stream, although
in 2.3 and -kh the relay can be on-demand.

karl.




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