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

[Ulrich K. <ul...@ch...>]

Gregory Malsack <gma...@gm...>:

> 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

No, I can't remember hearing of a similar bug.

Which version of SoX are you using ("sox -V4 --version")? MP3 encoding  
is done via libmp3lame, which version is that?

When you say "at random times", is it random per input file (i.e. when  
repeatedly processing the same file, the problem will occur at the  
same point) or per invocation (i.e. different results for repeated  
processing)? If it's the former, an example file would be good to have.

Ulrich