On Jan 14, 2009, at 12:27 PM, Steve Underwood wrote: > John Todd wrote: >> The G.729.1 "wideband" codec is starting to show a slight bit of >> traction. There is a possibility that Asterisk could support G.729.1 >> - would you use it or buy it if it was available? More importantly, >> does any equipment with which your systems currently exchange traffic >> support G.729.1? Currently, the number of devices supporting G.729.1 >> seems to be fairly limited and it may be an imbalanced decision to >> support a codec that nobody else uses. >> >> If G.729.1 were to be offered as a codec for Asterisk by Digium, it >> would have to be as a commercial product, as the codec is patent- >> encumbered. Pricing and licensing terms are outside the scope of >> this >> discussion, but I would expect something like G.729. Of course, >> passthrough-mode (non-transcoding) would not require licensing with >> Asterisk and is outside of the scope of this question. Timing is >> also >> an unknown issue - there are obviously many other projects in the >> pipeline for the Digium engineering team to work on before this >> probably could be completed, even if the decision is made to pursue a >> development effort. >> >> >> Note that G.722 is free and already available, and may have similar >> MOS scores (but certainly not exactly similar) as that of G.729.1. >> Comparisons of G.729.1 and G.722 are left as exercises to the reader, >> or see the excellent presentation below which is quite enlightening. >> >> Your opinions are welcome on the topic! >> >> Resources: >> http://portal.etsi.org/stq/workshop2007presentations/quinquis_slides.pdf >> http://en.wikipedia.org/wiki/G.729.1 >> http://en.wikipedia.org/wiki/G.722 >> >> [Apologies for the cross-post - this has some interest to both the >> user and development community, I think. I'll also apologize for >> what >> is a post about issues that are not "open-source", but it seems that >> within Digium I'm probably the most appropriate person to canvass the >> community on this particular question, as it involves gauging the >> general thinking of the VoIP community and is not merely a Digium- >> only >> concern.] >> > Where have you seen it getting traction? France Telecom came up with > it, > and are using it, but that's kind of isolated from the rest of the > universe. The PDF you referenced is little more than a France Telecoms > sales pitch for G.729.1. Audiocodes announced something, but its vague > and they aren't shipping yet. AMR-WB would make more sense, as 3G > cellphones all use it, and transcoding these things looses huge > amounts > of quality. G.722.1 is also getting somewhere, largely because of > Polycom's commitment to it. > > The really wacky one is G.711.1. Has anyone heard of people taking > that > seriously. > > Regards, > Steve
"slight bit" = Audiocodes, and SPIRIT DSP code on some TI chips. Others? I don't know, I'd be interested in seeing if so. G.711.1 is still a ghost codec, from what I've been able to see. JT --- John Todd email:jt...@digium.com Digium, Inc. | Asterisk Open Source Community Director 445 Jan Davis Drive NW - Huntsville AL 35806 - USA direct: +1-256-428-6083 http://www.digium.com/ _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
