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[nik.middleton at noble...]

Hi Guys,

I’m looking for the optimum audio format when using streamfile in a lua script.

I’ve found CPU load increases rapidly with the number of threads playing a .wav file. Can anyone tell me the optimum when using g711a?

Right now the the .wav files are

Audio format: PCM
Sample rate : 8 kHz
Mono
Sample Size: 16 bit
Bit rate :128kbps

Will it help CPU load if I resample to a bit rate of 64kbps and sample size of 8 bit?

I have read that the sample size needs to be 13-14bit +1 for alaw/ulaw though

Regards,

[anthony.minessale at g...]

Looking at your post, You are already using the best format.
If you do not have a fast filesystem try making a ram disk and play the files from there instead.

if you *really* want you can use sox to turn them all into raw alaw files and rename them with a .PCMA extension
to avoid the g711 transconding but g711 to PCM is pretty trivial. it's more likely a file i/o distress you see.


On Thu, Apr 16, 2009 at 5:04 PM, Nik Middleton <nik.middleton@noblesolutions.co.uk (nik.middleton@noblesolutions.co.uk)> wrote:

[nik.middleton at noble...]

Thanks for this. One of the servers is using sata and the other scsii drives, so that may be the problem, I’ll give it a go. Problem seems to escalate past 200 active calls. Below that all is well.

That said, it could also be a db issue, so I’ve changed my log tables to innodb (I’m hoping that now I have row level locking as opposed to table level it will help)

Regards,


From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: 16 April 2009 23:25
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] Optimum sound file format


Looking at your post, You are already using the best format.
If you do not have a fast filesystem try making a ram disk and play the files from there instead.

if you *really* want you can use sox to turn them all into raw alaw files and rename them with a .PCMA extension
to avoid the g711 transconding but g711 to PCM is pretty trivial. it's more likely a file i/o distress you see.


On Thu, Apr 16, 2009 at 5:04 PM, Nik Middleton <nik.middleton@noblesolutions.co.uk (nik.middleton@noblesolutions.co.uk)> wrote:
Hi Guys,

I’m looking for the optimum audio format when using streamfile in a lua script.

I’ve found CPU load increases rapidly with the number of threads playing a .wav file. Can anyone tell me the optimum when using g711a?

Right now the the .wav files are

Audio format: PCM
Sample rate : 8 kHz
Mono
Sample Size: 16 bit
Bit rate :128kbps

Will it help CPU load if I resample to a bit rate of 64kbps and sample size of 8 bit?

I have read that the sample size needs to be 13-14bit +1 for alaw/ulaw though

Regards,



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