[Asterisk-Users] processing power / codecs

[Whisker, Peter]

This is my codec translation timing table (500MHz PIII).

The fastest codec is G.711 (ulaw/alaw) which is uncompressed, next is GSM.
The slinr->codec row gives the amount of time (and probably relates to
processing power) in coding and the codec->slinr columns are the decoding
time.

Speex is variable (OGG based) but is the slowest in general with ILBC and
G729A pretty slow too.

         Translation times between formats (in milliseconds)
          Source Format (Rows) Destination Format(Columns)

         G723   GSM  ULAW  ALAW  G726 ADPCM SLINR LPC10 G729A SPEEX  ILBC
   G723     -     -     -     -     -     -     -     -     -     -     -
    GSM     -     -     4     4    12     4     3    20    50    85    59
   ULAW     -     9     -     1    10     2     1    18    48    83    57
   ALAW     -     9     1     -    10     2     1    18    48    83    57
   G726     -    16     9     9     -     9     8    25    55    90    64
  ADPCM     -     9     2     2    10     -     1    18    48    83    57
  SLINR     -     8     1     1     9     1     -    17    47    82    56
  LPC10     -    17    10    10    18    10     9     -    56    91    65
  G729A     -    19    12    12    20    12    11    28     -    93    67
  SPEEX     -    17    10    10    18    10     9    26    56     -    65
   ILBC     -    18    11    11    19    11    10    27    57    92     -

Peter

-----Original Message-----
From: Kristian Kielhofner [mailto:kris at krisk.org]
Sent: 10 November 2004 04:39
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] processing power / codecs


TELUX wrote:
> is there a lot of processing power difference between ulaw an G711 when 
> in a meet-me?
> 
> Thanks
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Telux,

	G.711 is a standard that defines Ulaw and Alaw, commonly called Ulaw

and Alaw.  But last I checked Meetme transcodes all codecs to Ulaw for 
the purposes of the conference.  So, I suppose G.711u would be your best 
bet for low processor overhead in Meetme.  Perhaps you meant G.729, 
G.723, or G.726?

G.729 - High processor usage, and a license
G.723 - No * support for transcoding
G.726 - No presonal experience from me.

--
Kristian Kielhofner
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