Hi, is there a way to use g729 in meetme? Thanks! -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070929/74f6e5d9/attachment.htm
Mojo with Horan & Company, LLC
2007-Oct-01 19:28 UTC
[asterisk-users] meetme conference using g729?
In my experience, and theoretically by design, it doesn't matter what codec you are using when you call a meetme conference. Moj Mark Quitoriano wrote:> Hi, > > is there a way to use g729 in meetme? > > Thanks! > ------------------------------------------------------------------------ > > _______________________________________________ > > Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ > > --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
I have been following this discussion. You do have a point. However, the way * works right now. If a channel does not require trans-coding to get into a conference, coder usage is counted. So I really do not know what difference putting the transcoding in meetme is going to make. I mean, how could this better contribute to better use of G729 licenses. -----Original Message----- From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Peter Fern Sent: Wednesday, October 03, 2007 7:09 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] meetme conference using g729? Tilghman Lesher wrote:> Or, in other words, you cannot mix compressed data. You must first > decompress the data for mixing, then recompress it for transmission. > During both operations, there is a potential for signal degradation. >Ummm, why?? Unless you can explain some technical reason for this, looks like about 11 lines to change, +3 for correct log messages, +1 for a define, +~3 to add it as a nice config option in meetme.conf. So, in all about... 18 lines worth of code to get it running on any available codec, configurable from meetme.conf, which IMHO would make a lot of sense for single-codec systems... especially for G.729 due to better use of licenses, but for others too, due to load reduction and improved audio quality... Of course, I could be missing something obvious, please correct me if that's the case. _______________________________________________ --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
But his preference of G729 is to save bandwidth. -----Original Message----- From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tim Panton Sent: Wednesday, October 03, 2007 8:16 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] meetme conference using g729? Not exactly. Here are the facts: meetme mixes in SLIN. Any data arriving in anything other than slin will get transcoded twice, once on the way in and again on the way out. Now some opinions: The more efficient the compression of the codec, the less well it copes with decoding and re-encoding. Ulaw and Alaw are simple and not that efficient, but you don't lose any more by re-encoding than you did by decoding in the first place. Tighter codecs like 729 and GSM you will definitely hear the difference. Theory: If you have a conference where there is only _ever_ one speaker at a time, you could (in theory) optimize meetme to do without mixing, and if all the participants were using the same codec, you could get away with not re-encoding by sending out the appropriate incomming packet to all (other) members. I'm guessing that isn't the case for you. Advice: use Ulaw - it's a decent tradeoff for this sort of thing. Tim. _______________________________________________ --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