[vorbis] Realtime encoding at 44.1khz

[k_myers at irito.com]

Dude...
you are going to need more CPU power, hands down. I have a stream up that is
running off a 500Mhz Celeron with 256MB of ram and it can barely keep things
going at 96kbps. I am using oddcast DSP Beta 26, and I do not have any
problems with what you are describing below with the sound. In a very old
version of oddcast there was a problem with similar to this. Check to make
sure you have the most recent version , and try it again.

For an example of a set up using oddcast, winamp, and icecast2win32 (also
from oddsock)  hit http://www.djlithium.com:8064/djlithium.ogg.

Cheers.

Lithium
----- Original Message -----
From: "Geoff Shang" <gshang at uq.net.au>
To: <vorbis at xiph.org>
Sent: Friday, September 07, 2001 7:03 AM
Subject: [vorbis] Realtime encoding at 44.1khz

> Hi:
>
> I've been experimenting with streaming vorbis across my network from the
> windows box to an icecast2 server on my linux machine (the server I
usually
> use is having some network issues at present).  I've tested both ostream
> 0.7.1 and oddcast beta26.   It seems that neither can encode on the fly on
> my P2-266 at 44100 fast enough to be able to stream it.  Ostream looked
the
> more promising of the two, with breaks in the audio but otherwise coping
OK
> ... until it crashed, presumably because it filled some buffer somewhere.
> It can maintain a 44.1khz mono stream at lowest bitrate (aprox. 40kbps)
but
> only just.  I only tried oddcast once, at 64kbps stereo.  It sounded very
> weird, as if it was only recording half the data in a given time period.
> It sounded as if it was playing at about double speed but wasn't pitch
> shifted.
>
> What I want to know is this.  Am I expecting too much of my P2-266 to do
> 44.1khz 64kbps stereo in real-time?  Assuming I'm not, is this an
> optimisation issue or should I be able to do it already?
>
> BTW: I don't know if anyone's fiddled with it or not, but I think results
> at lower sampling rates could be improved if the lowpass wasn't so severe.
> Of course, I don't know if this will introduce artifacts, but I can easily
> hear the roll-off and it's noticeably lower than the uncompressed audio
> would be at that rate.  For example, the difference between vorbis at
> 44.1khz and 32khz is more noticeable, particularly in stereo, than it is
> for uncompressed samples.
>
> Geoff.
>
>
>
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