FFMPEG Output

ubuntu@ubuntu:~$ sudo ffmpeg -f video4linux2 -r 25 -s 640x480 -i /dev/video0 -c:v rawvideo -f rawvideo -pix_fmt yuv420p -
ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  built on Mar 31 2013 01:04:55 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
< ------ At this point, I waited about a minute before cancelling it ----- >
^C