Compiling the kaltura nginx with live rtmp

Hi again Jess,
Seems i get Reloading nginx configuration: /opt/kaltura/nginx/sbin/nginx: error while loading shared libraries: libavcodec.so.57: cannot open shared object file: No such file or directory, when trying to run apt-get install kaltura-nginx after adding the repo, the OS I use is ubuntu 14.04, also tried installing ffmpeg because i know it has the respective library in it, but I still get the error.
Please advise.

Thanks in advance.
Jacob R.