Here's a comparison of the various codecs on a 533 Mhz Xscale. This is with speex 1.1.7, with fixed point and arm assembly enabled... I was pleased to see that the other codecs, besides speex, scale roughly comparable with clock vs a vs the P4....
g723 gsm ulaw alaw g726 adpcm slin lpc10 g729 speex ilbc g723 - - - - - - - - - - - gsm - - 8 8 19 8 7 - - 166 - ulaw - 15 - 1 13 2 1 - - 160 - alaw - 15 1 - 13 2 1 - - 160 - g726 - 24 11 11 - 11 10 - - 169 - adpcm - 15 2 2 13 - 1 - - 160 - slin - 14 1 1 12 1 - - - 159 - lpc10 - - - - - - - - - - - g729 - - - - - - - - - - - speex - 35 22 22 33 22 21 - - - - ilbc - - - - - - - - - - - On Apr 11, 2005 10:03 PM, Michael Giagnocavo <[EMAIL PROTECTED]> wrote: > >On Fri, 2005-04-08 at 09:33 -0500, Brian West wrote: > >> Speex is a CPU whore. Even more so than g729. > > > >How much of a whore are we talking about here? Clock cycles are cheap, > >so if I can get 7 channels of speex with a dual 900Mhz PIII (my current > >system) I'd say it's worth the savings in bandwidth. > > > >FWIW, I just spoke to VoicePulse and their engineering department said > >they will support Speex with IAX termination within 1 to 2 days. > > > >-lee > > It's about 3 times worse than G729 for encoding and just a tad bit faster on > decoding. So, from a provider's standpoint, that means reduced capacity per > machine, which in turn means higher overhead and less profit. Usually when > you work out rates, you'll get your codecs worked out too. If your provider > has to do expensive CPU work, expect to pay for it. Then again, if you're > not running tons of traffic, it might just not make enough difference and > they probably play the average (considering some use ULAW and some GSM, > which could balance out your Speex usage). > > Just for comparison, here's a complete "show translation" table: > > Translation times between formats (in milliseconds) > Source Format (Rows) Destination Format(Columns) > > g723 gsm ulaw alaw g726 adpcm slin lpc10 g729 speex ilbc > g723 - 4 2 2 3 2 1 7 11 31 18 > gsm 12 - 2 2 3 2 1 7 11 31 18 > ulaw 12 4 - 1 3 2 1 7 11 31 18 > alaw 12 4 1 - 3 2 1 7 11 31 18 > g726 13 5 3 3 - 3 2 8 12 32 19 > adpcm 12 4 2 2 3 - 1 7 11 31 18 > slin 11 3 1 1 2 1 - 6 10 30 17 > lpc10 13 5 3 3 4 3 2 - 12 32 19 > g729 13 5 3 3 4 3 2 8 - 32 19 > speex 12 4 2 2 3 2 1 7 11 - 18 > ilbc 14 6 4 4 5 4 3 9 13 33 - > > Speex is definitely the worst performer here, as far as CPU time goes. > (These numbers from a P4 2.4GHz, using Digium's G729 P4 codec, and Intel's > G723, 5.3 rate, optimized for P4, and Speex 1.0.4-1, Asterisk > CVS-HEAD-04/11/05-19:24:17). > > -Michael > > > _______________________________________________ > Asterisk-Biz mailing list > Asterisk-Biz@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-biz > -- Mike Taht PostCards From the Bleeding Edge http://the-edge.blogspot.com _______________________________________________ Asterisk-Biz mailing list Asterisk-Biz@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-biz