[sldev] Voice = Proprietary

Tim Shephard tshephard at gmail.com
Sun Mar 11 21:08:35 PDT 2007


Speex looks cool.

 Is there an example of it handling group chat?

I couldn't find any attenuating patents (except by IBM), so we might
be able to go ahead and do that .. though I wonder how easy that would
be.

Anyways.. not sure what the complaint is here.  If we want an open
source version, I'm sure we can go ahead and do one.   Let's make the
serverside bit BSD though, and package it with opensim..

On 3/11/07, Callum Lerwick <seg at haxxed.com> wrote:
> On Sat, 2007-03-10 at 22:18 -0800, Joe Miller wrote:
> > I'll be happy to post more about this as we get closer to our release,
> > but the codecs in use for voice are standard.  We're using G.711 and
> > G.722.1 (annex C) both of which are described in relevant ITU
> > specifications.  We use RTP as media transport - the standard payload
> > type is used for G.711 and a custom tag for G.722.1(C).  The control
> > protocol is SIP (RFC 3261).
>
> Hah hah hah. You're shitting me. G.711 is essentially a Sun .au file.
> (Remember those?) Ah, the best technology 1972 can provide. 64kbit?
> Speex doesn't even go up that high!
>
> And G.722.1 is patented and has licensing terms that are unusable by
> open source projects as spot determined elsewhere in the thread. Its
> capabilities seem to be similar to Speex.
>
> This is the best closed source has to offer? What a farce.
>
> Speex is good enough for Xbox Live, Half Life and the United States Army
> Land Warrior system. Is Linden Lab really too good for Speex?
>
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