[SoX-users] channels out of sync converting wav to mp3

[Gregory M. <gma...@gm...>]

Hey All, 

I manage an asterisk server. The system records all calls coming into the system to a wav file. My client wants the files stored on his website as an mp3 for people to download. I'm using sox to run the conversion, but I'm having problems where the conversation is not correctly timed in the mp3 file. The call will start out ok, but at random times anywhere from 30 seconds to 5 minutes into the call recording, you can hear the 2 channels falling out of sync, and eventually the 2 people in the recording are talking on top of each other. The wav file is right, but the mp3 version is not. 

Has anyone experienced this problem? If so what did you do to correct this? If not, does anyone have any suggestions? I've moved the sox conversion process to a stand-a-lone machine, but it's still happening. Here's the command I'm using... 

sox /recordings/$file_name.wav /frink/$file_name.mp3 

machine doing the conversion has the following processor: 

processor : 1 
vendor_id : GenuineIntel 
cpu family : 15 
model : 2 
model name : Intel(R) Pentium(R) 4 CPU 3.06GHz 
stepping : 9 
cpu MHz : 3066.079 
cache size : 512 KB 
physical id : 0 
siblings : 2 
core id : 0 
cpu cores : 1 
apicid : 1 
fdiv_bug : no 
hlt_bug : no 
f00f_bug : no 
coma_bug : no 
fpu : yes 
fpu_exception : yes 
cpuid level : 2 
wp : yes 
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr 
bogomips : 6130.75 

Thanks for any suggestions! 
Greg