Add -timelimit option
This option limits the CPU time used by ffmpeg to the number of seconds
specified. After this time, the OS sends a SIGXCPU signal, which we
handle and attempt to exit cleanly. If the process is stuck, the OS
will deliver a SIGKILL one second later, forcibly terminating the
This functionality is useful in automated setups where a runaway ffmpeg
process would otherwise go undetected.
Originally committed as revision 21347 to svn://svn.ffmpeg.org/ffmpeg/trunk