[Freeswitch-users] Optimum sound file format

Nik Middleton nik.middleton at noblesolutions.co.uk
Thu Apr 16 15:04:48 PDT 2009

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



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