up2date -i subversion
up2date -i ruby
cd ~
svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
svn checkout svn://svn.mplayerhq.hu/mplayer/trunk mplayer
wget http://www3.mplayerhq.hu/MPlayer/releases/codecs/essential-20061022.tar.bz2
tar xvjpf essential-20061022.tar.bz2
cd essential-20061022
mkdir /usr/local/lib/codecs
mv * /usr/local/lib/codecs/
chmod -R 755 /usr/local/lib/codecs/
cd ~
wget http://superb-east.dl.sourceforge.net/sourceforge/lame/lame-3.97.tar.gz
tar xvzpf lame-3.97.tar.gz
cd lame-3.97
./configure
make
make install
cd ~
wget http://downloads.xiph.org/releases/ogg/libogg-1.1.3.tar.gz
tar xvzpf libogg-1.1.3.tar.gz
cd libogg-1.1.3
./configure
make
make install
cd ~
wget http://downloads.xiph.org/releases/vorbis/libvorbis-1.1.2.tar.gz
tar xvzpf libvorbis-1.1.2.tar.gz
cd libvorbis-1.1.2
./configure
make
make install
cd ~
wget http://rubyforge.org/frs/download.php/9225/flvtool2_1.0.5_rc6.tgz
tar xvzpf flvtool2_1.0.5_rc6.tgz
cd flvtool2_1.0.5_rc6
ruby setup.rb config
ruby setup.rb setup
ruby setup.rb install
cd ~
cd mplayer
./configure
make
make install
cd ~
mkdir /usr/local/src/tmp
chmod 777 /usr/local/src/tmp
export TMPDIR=/usr/local/src/tmp
cd ffmpeg
./configure --enable-libmp3lame --enable-libogg --enable-libvorbis --disable-mmx --enable-shared
make
make install
cd ~
ln -s /usr/local/lib/libavformat.so.50 /usr/lib/libavformat.so.50
ln -s /usr/local/lib/libavcodec.so.51 /usr/lib/libavcodec.so.51
ln -s /usr/local/lib/libavutil.so.49 /usr/lib/libavutil.so.49
ln -s /usr/local/lib/libmp3lame.so.0 /usr/lib/libmp3lame.so.0
ln -s /usr/local/lib/libavformat.so.51 /usr/lib/libavformat.so.51
wget http://umn.dl.sourceforge.net/sourceforge/ffmpeg-php/ffmpeg-php-0.5.0.tbz2
tar xvjpf ffmpeg-php-0.5.0.tbz2
cd ffmpeg-php-0.5.0
phpize
./configure
make
make install
cd ~
cp /usr/local/lib/php/extensions/no-debug-non-zts-20020429/ffmpeg.so /usr/local/lib/php/extensions/

Modify /usr/local/Zend/etc/php.ini (or equivalent) and add the module to the list of extensions: 

extension_dir = "/usr/local/lib/php/extensions/"
extension=ffmpeg.so

Now save and restart apache and test php for ffmpeg: 

service httpd stop
killall -9 httpd
service httpd startssl
php -i | grep -i ffmpeg