Hi

Why left and right channels' voice shifted from each other in the recorded mp3?

I record the sessions' voice thios way:
<action application="set" data="execute_on_answer=record_session $${base_dir}/Record/${strftime(%Y%m%d-%H%M%S)}.mp3"/>
When i listen back the mp3, at begining the two chennels are synchonized, but after some minutes there will be a shifting between the channels.

Why?

thanks,
Robert