Unknown directive "ffmpeg"

I'm setting up Amazon AWS s2 Linux(non-AMI) and building up nginx and rtmp from scratch. I follow exactly tutorials at here. When I'm eidting nginx.conf, adding ffmpeg and restart my nginx. Unknown directive "ffmpeg" occurs.

Nginx.conf

rtmp {
    server {
            listen 1935;
            chunk_size 4096;
            notify_method get;

            application live {
                    live on;
                    ffmpeg  -re -i /var/video/test.mp4 -c copy -f flv rtmp://locahost/live;
            }
    }

}

Way I start nginx:

sudo /usr/local/nginx/sbin/nginx

Way I stop:

sudo /usr/local/nginx/sbin/nginx -s stop

From what I knew, I need to recompile the nginx ? Because I'm using "sudo apt-get install nginx" when I start-up my VPS.