[Vorbis] Use of ogg vorbis for real time audio streaming?

[d00ma3 at tomsmusicpage.org.uk]

<014c01c462aa$8a651820$021a0852 at Andrew>
Message-ID: <1089106122.40ea70ca668f0 at www.tomsmusicpage.org.uk>


Thanks for the replies and the links!

It seems like perhaps ogg vorbis will be usable for what I want. There is the
alternative possibility of investigating how well a speech codec like Speex
encodes music and working on extending the bandwith. Either way, it is critical
to remove as much of the latency as possible. I guess it's getting near time to
dive into some code!


@ Andrew -- my website is (a little) out of date right now; I graduated
recently, and this research is being done as part of my new job :)


Thanks again for the information.


Tom



Quoting Andrew Brampton <andrew at bramp.freeserve.co.uk>:

> If its any help I know of two people who recently as part of a Computer
> Science degree tackled this type of problem
> I did a quick google and I could only find the report for one of the
> projects.
> http://netjam.freehomepage.com/
>
> I think the general outcome of the project was to decide that real-time
> musical collaboration was not possible over the internet due to the high
> real-time requirements of musicians.
>
> But maybe this research will help you out.
>
> Andrew
>
> P.S Just had a quick look on your website and I see you are also a student
> :).. So I guess this is part of dissertation also. Well good luck with it :)
> ----- Original Message -----
> From: <d00ma3 at tomsmusicpage.org.uk>
> To: <vorbis at xiph.org>
> Sent: Monday, July 05, 2004 3:40 PM
> Subject: [Vorbis] Use of ogg vorbis for real time audio streaming?
>
>
> >
> >
> > Hi list!
> >
> >
> > I am currently investigating the possibility of allowing musicians to
> > collaborate over the internet --
> >
> > Musician A  -------> internet --------> Musician B
> >
> > This diagram obscures quite a lot of detail. In reality, the datapath
> would look
> > more like this:
> >
> > Musician A
> > ADC
> > Compression algorithm
> > UTP   (or perhaps RTP?)
> > IP
> > ADSL
> > the Internet
> > ....<snip>.....
> >
> > Clearly, this link would have to be two-way; and should have a reasonable
> > latency (perhaps under 100ms). I understand that this is a challenging
> task,
> > and perhaps even impossible. However, I think it is possible that with
> > attention to detail at every level of the datapath it could be done.
> >
> > So. My question is: is ogg vorbis (as a whole, bitstream and codec)
> appropriate
> > for such an application? I have studied the documentation, and it seems to
> me
> > that there are several barriers (for example, ogg pages are recommened to
> be
> > 4-8kB, this is 0.5 - 1 sec worth of audio for a 64kbps stream). Could I
> work
> > around these limitations by aggressively setting certain parameters in the
> > code, or is this a no-brainer from the outset?
> >
> >
> > Any suggestions would be gratefully received!
> >
> > Best regards,
> >
> >
> > Tom
>
>