7
Well, in that case you are out of luck. In order to install ffmpeg you have to have root privileges, you have to 'make' and then 'make install' and for that you need a real shell access. You can ask you service provider about it. If you can, try issuing a command 'which ffmpeg' when you ftp to your server, it will show you a path to ffmpeg to where it is if it is installed.
Good luck.