ffmpeg

bellow is the link for ffmpeg doc

ffmpeg is used in conversion of several file formats from one to another

you can just check the bellow for more information

http://ffmpeg.mplayerhq.hu/ffmpeg-doc.html

this command will convert mpg to picture files...

ffmpeg -r 1 -i gentleman.mpg -r 1 -s 80x80 out%d.gif

the bellow command will capture the video and audio from devices to mpg files

 ffmpeg -f audio_device -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg