[Freeswitch-users] Optimum sound file format

Nik Middleton nik.middleton at noblesolutions.co.uk
Thu Apr 16 15:58:56 PDT 2009

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)





From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of
Anthony Minessale
Sent: 16 April 2009 23:25
To: freeswitch-users at 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 at noblesolutions.co.uk> wrote:

Hi Guys,


I'm looking for the optimum audio format when using streamfile in a lua


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


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



Freeswitch-users mailing list
Freeswitch-users at lists.freeswitch.org

Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/

AIM: anthm
MSN:anthony_minessale at hotmail.com
<mailto:MSN%3Aanthony_minessale at hotmail.com> 
GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
<mailto:PAYPAL%3Aanthony.minessale at gmail.com> 
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888 at conference.freeswitch.org
<mailto:sip%3A888 at conference.freeswitch.org> 
iax:guest at conference.freeswitch.org/888
googletalk:conf+888 at conference.freeswitch.org
<mailto:googletalk%3Aconf%2B888 at conference.freeswitch.org> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20090416/6e092e96/attachment-0002.html 

More information about the FreeSWITCH-users mailing list