Using FFMpeg to cut a video into 2 minute clips

Question

I have a video lasting 10 minutes which I want to cut into five 2-minute segments.

I can use ffmpeg to cut a video to a specific time with the following:

ffmpeg -sameq -ss [start_seconds] -t [duration_seconds] -i [input_file] [outputfile]

Do I first have to obtain the length of the video and then repeat the above command, or is there a simpler way to do this?

Answer 1

i=-120
infile=<inputfile>
while [[ "$?" == "0" ]]; do \
    ((i+=120)) \
    ffmpeg -sameq -ss $i -t 120 -i $infile ${infile/.mpg/.$((i/120)).mpg} \
done