Compiling and installing ffmpeg using the AUR was simply a breeze!!!
Edit the config file -- add your codecs -- and boom! -- Done!!
I remember the time this actually took to do in Ubuntu using Andrew46's guide (very comprehensive). Compiling in Arch however was so damn easy it almost felt like cheating!!!
I'm just curious why the apt-get system isn't setup for easy compilation? Maybe I'm just not as experienced enough with other package managers, however using yaourt at least for this task was just plain simple!