I wish to convert several thousands of audio files mostly in mp3 format
to AAC using the Soundconverter application. So far I have installed the
application and the packages gstreamer$VERSION-plugins-$CODECCOLLECTION
where VERSION=('0.10' '1.0') and CODECCOLLECTION=('base' 'good' 'bad'
'ugly') - doing the usual guesswork and then trying to find info
online :) - but AAC does not present itself as an available target
encoding.

What package do I need to install in order to make AAC available? Should
I perhaps be using some other software instead of Soundconverter?

Thanks!
/fuumind