ffmpeg + mplayer + mencoder script for fedora/centos or any linux host (debian/ubuntu)

Needed for this php class

http://www.phpclasses.org/browse/package/3747.html where generic install is described but we hope to make it fully scriptable

here http://www.phpclasses.org/browse/file/18261.html

TO DO :

1. Rewrite the script in php
2. And use the ubuntu/debian build method (debian way) https://wiki.ubuntu.com/ffmpeg
3. And use the fedora/centos build method (redhat way)