parallaxed.net

Support for this codec is provided by libfaad

You may be receiving such woes as :

Unsupported codec (id=73728)
Audio: mp4a / 0x6134706D

Google points in the direction of a few mailing list posts

Despite the above, there’s an option in the latest svn release (today) of ffmpeg, that bears a bizarre configuration option. In addition to

--enable-libfaad

I used

--enable-libfaadbin

Which seemed to conclude further objection from ffmpeg.

Initially libfaad builds into /usr/local, so you may need to symlink

ln -s /usr/local/lib/libfaad.so /usr/lib/libfaad.so

…before the celebrations can begin.