[Icecast] converting mp3's to aac+ or ogg

[Dave]

Hello,
    I've got a FreeBSD 6 machine running icecast2 and ices0streaming four 
different streams of mp3's. Now i have a need to stream the same content as 
either aac+ or ogg vorbis whichever would be easiest to set up and give the 
best quality. I want these new streams to handle both broadband and dialup 
users without sacrificing quality. My problem is i really really do not want 
to have to manually go through my media again and bring them in to aac+ or 
ogg, doing it once for mp3 was bad enough. I used abcde to handle this, and 
as i said i'd like to find an automated way of reworking these files. Any 
suggestions welcome.
Thanks.
Dave.