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Install wget & gcc

Install epel repo

Install PHP and the cURL and GD PHP extensions

Enable mod_rewrite

Install FFmpeg

Download a precompiled version of FFmpeg
If you want a precompiled version of FFmpeg + codecs for your CentOS server, then you can download a recent static build of FFmpeg here.
Use the x86_64 build for 64-bit servers and the x86 build for 32-bit servers.
Decompress the corresponding tar.xz distribution, and locate the 'ffmpeg' binary file.
To install this build, simply upload the 'ffmpeg' binary file to your "/usr/bin" directory and change permissions of the file to chmod 0755 or higher. And, presto, you have a fully-functioning CentOS build of FFmpeg + codecs, compatibile with my software, that you did not have to compile yourself!
OR, Compile FFmpeg from source
Get the dependencies

yum install autoconf automake gcc-c++ libtool make nasm pkgconfig zlib-devel git
Make a directory in “/root/” to put all of the source code into:

cd /root 
mkdir ~/ffmpeg_sources
Build/Install FFmpeg and codecs as follows

Yasm
cd ~/ffmpeg_sources 
curl -O http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz 
tar xzvf yasm-1.2.0.tar.gz 
cd yasm-1.2.0 
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" 
make 
make install 
make distclean 
export "PATH=$PATH:$HOME/bin"
libmp3lame
MP3 audio encoder. 
Requires FFmpeg to be configured with --enable-libmp3lame

cd ~/ffmpeg_sources 
curl -L -O http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz 
tar xzvf lame-3.99.5.tar.gz 
cd lame-3.99.5 
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm 
make 
make install 
make distclean
FFmpeg
cd ~/ffmpeg_sources 
git clone --depth 1 git://source.ffmpeg.org/ffmpeg 
cd ffmpeg 
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" 
export PKG_CONFIG_PATH 
./configure --prefix="$HOME/ffmpeg_build" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libmp3lame 
make 
make install 
make distclean 
hash -r 
. ~/.bash_profile
After all of this, FFmpeg will be compiled into "/root/bin/ffmpeg".

Move the FFmpeg binary file from “/root/bin/ffmpeg” to “/usr/bin/ffmpeg”. Then set permissions of “/usr/bin/ffmpeg” to chmod 0777.

mv /root/bin/ffmpeg /usr/bin/ffmpeg
chmod 0777 /usr/bin/ffmpeg

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