PHP Fast CGI Timeout for exec

Hi,

I have Apache Server with PHP Fast-CGI installed, noticed that it stop to run exec after some time.
my php.ini setting is:

max_execution_time 7200
max_input_time 7200

if i switch to PHP: Apache Handler, it seem work fine, i use to exec mplayer for converting video, upload and convert. It dont work on Fast Cgi, is there any setting for fast cgi timout or request or something else?

Please help me.

Thanks