Split video file using ffmpeg and mencoder

Example:

ffmpeg -i input.flv -ss hh:mm:ss -t hh:mm:ss output.flv

Where:

-ss :  Buration
-t : Start time
hh: hours
mm: minutes
ss: seconds

If this does not work try mencoder:

 mencoder -ss 00:00:00 -endpos 00:35:20 -oac pcm  -ovc copy input.mp4 -o output.mp4