You are going about installing ffmpeg the wrong way .. make would not work because you are not in the right directory
Easy way for installation add new repo at /etc/yum.repos.d
nano -w /etc/yum.repos.d/dag.repo
Inset
[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
gpgcheck=1
enabled=1
Then Install
yum install ffmpeg ffmpeg-devel
its as easy as that ... to install ffmpeg-php
wget /path/to/this/file/ffmpeg-php-0.5.2.1.tbz2
tar -xjf ffmpeg-0.5.2.1.tbz2
phpize
./configure
make
make install
Can you see where you use make ??? After extracting the compressed file
Lastly PHP.INI
nano /etc/php.ini
[ffmpeg]
extension=ffmpeg.so
Sometimes you need to create new ffmpeg.ini file and php reads it automatically .. this depends on your confifuration
I hope this helps
Thanks
:)