Understanding codec translations

Asterisk Asterisk Support
1

Hi,

Looking at the output of core show translation

         Translation times between formats (in microseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

          codec2  ulaw  alaw   gsm  g726 g726aal2 adpcm slin8 slin12 slin16 slin24 slin32 slin44 slin48 slin96 slin192 lpc10 speex8 speex16 speex32  ilbc  g722  opus
   codec2      - 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
     ulaw  15000     -  9150 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
     alaw  15000  9150     - 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
      gsm  15000 15000 15000     - 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
     g726  15000 15000 15000 15000     -    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
 g726aal2  15000 15000 15000 15000 15000        - 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
    adpcm  15000 15000 15000 15000 15000    15000     -  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 15000 17250 23000
    slin8   6000  6000  6000  6000  6000     6000  6000     -   8000   8000   8000   8000   8000   8000   8000    8000  6000   6000   14000   14000  6000  8250 14000
   slin12  14500 14500 14500 14500 14500    14500 14500  8500      -   8000   8000   8000   8000   8000   8000    8000 14500  14500   14000   14000 14500 14000 14000
   slin16  14500 14500 14500 14500 14500    14500 14500  8500   8500      -   8000   8000   8000   8000   8000    8000 14500  14500    6000   14000 14500  6000 14000
   slin24  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500      -   8000   8000   8000   8000    8000 14500  14500   14500   14000 14500 14500 14000
   slin32  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500      -   8000   8000   8000    8000 14500  14500   14500    6000 14500 14500 14000
   slin44  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500      -   8000   8000    8000 14500  14500   14500   14500 14500 14500 14000
   slin48  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500      -   8000    8000 14500  14500   14500   14500 14500 14500  6000
   slin96  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500   8500      -    8000 14500  14500   14500   14500 14500 14500 14500
  slin192  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500   8500   8500       - 14500  14500   14500   14500 14500 14500 14500
    lpc10  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000     -  15000   23000   23000 15000 17250 23000
   speex8  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000      -   23000   23000 15000 17250 23000
  speex16  23500 23500 23500 23500 23500    23500 23500 17500  17500   9000  17000  17000  17000  17000  17000   17000 23500  23500       -   23000 23500 15000 23000
  speex32  23500 23500 23500 23500 23500    23500 23500 17500  17500  17500  17500   9000  17000  17000  17000   17000 23500  23500   23500       - 23500 23500 23000
     ilbc  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000     - 17250 23000
     g722  15600 15600 15600 15600 15600    15600 15600  9600  17500   9000  17000  17000  17000  17000  17000   17000 15600  15600   15000   23000 15600     - 23000
     opus  23500 23500 23500 23500 23500    23500 23500 17500  17500  17500  17500  17500  17500   9000  17000   17000 23500  23500   23500   23500 23500 23500     -

is it accurate to say that if I am using ulaw for my codec on the call and the files are stored in opus format instead of say slin8 that the CPU cost will be roughly 3x? Is that a fair statement?

2

23000 / 9000 = 2.555 so yes about 3x, agreed.

Any real-world data since the post to back up the theory ?

3

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.