[Icecast-dev] source buffer

Byron Young bky at bkyoung.com
Sun Dec 6 16:48:05 PST 2015

Maybe others can address shoutcast issues...

Regarding buffering ...

The client has a buffer. The moc client, for example, defaults to
Prebuffering=64 and InputBuffer=512 (both KB). After source stops
sending the stream, either after playlist finish (no repeat), file
finished, error, or stop (via ctrl-c maybe), there are still packets in
the network being routed to both the server and the client. This client
buffer then would remain full until all stream packets delivered
(ideally intime for a continuous playback). The more between hops would
imply longer client buffer full after source client shutdown. These
packets are most likely in the network interface queues, and, depending
on router(s) queuing discipline (qdisc) traffic control / shaping
setting, may be delayed, possibly until some other higher priory traffic

On Mon, 2015-12-07 at 01:18 +0300, Yaniv Sharon wrote:
> I will give a little background...
> For more than 10 years until now im using Shoutcast 1.9.5/1.9.8 win32
> on my machines. "What's working, d'ont touch".
> Now im changing to ice 2.4.2.
> The flexibility of the ice is great.
> but, because of the things that "hidden" from the eye im little bit
> afraid to make changes that will be dramatic for the listeners.
> So, for the beginning, at least I want to start with what I use to
> have and know to work with my machines. As the most of you guys qnow,
> the shoutcast always was "closed system". So I will try:
> mp3 @ 128kbps:
> 1. "Source buffer": when I stop the encoder (closing down), the buffer
> at the listener side remains full for several seconds (8...10), and
> only than he START to fall down to zero. So I think/guess that there
> is a buffer between the encoder to the server (Maybe...!) If there is,
> maybe it can help in some cases of unstable connection between the
> encoder to the server.
> 2. Burst/Queue size: with my stream monitor I measured that the burst
> size of the shoutcast (1.9.8) is 256K. And that whats lead me to the
> next question...someone knows what is the queue size that the old
> shoutcast working?
> Again, the issue here is not to talk about shoutcast and what she can
> do. My goal at this time of startig with ice is to continue with what
> I was have until now and from that to make changes (or not).
> If someone can help with that I will be glad for sure :)
> Thanks for reading...
> Good evening,
> On Wed, 2015-12-02 at 16:51 +0200, Yaniv Sharon wrote:
> > Hi,
> >
> > There is a way to increase the source buffer?
> >
> > (Not the buffer from icecast to listener, the buffer from the
> encoder
> > to server)
> There is no 'source buffer'. Maybe you can tell us what problem you
> face / what your goal is? I think we can help you better if we
> understand your problem a bit better.
> Have a nice day!
> --
> Philipp.
>  (Rah of PH2)
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