ffmpeg
convert video to jpg cutting (crop) a rectangle 428 width, 315 high starting at x=100, y=88 :
./ffmpeg -i Star\ Trek\ Red\ Alert\ Screen.flv -filter:v "crop=438:315:100:88" starTrek%d.jpg
convert video to jpg cutting (crop) a rectangle 428 width, 315 high starting at x=100, y=88 :
./ffmpeg -i Star\ Trek\ Red\ Alert\ Screen.flv -filter:v "crop=438:315:100:88" starTrek%d.jpg