jared@jareds:~$ apt-get source ffmpeg
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to find a source package for ffmpeg
jared@jareds:~$ sudo apt-get build-dep ffmpeg
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to find a source package for ffmpeg
jared@jareds:~$