i did this because of the followin error:
FFMPEG unsupported codec id=86018
port didn’t help much 
get the latest ffmpeg svn revision via svn
download faac from here:
http://sourceforge.net/project/showfiles.php?group_id=704
install it with:
./configure
make && make install
for ffmpeg do:
make distclean && ./configure –enable-libmp3lame –enable-shared –disable-mmx –enable-gpl –enable-libfaac –enable-libfaad –disable-swscale-alpha && make && make install
