Hi,
If you are interested on developing an application which requires AAC/MP3 codecs, now you can do it with RidgeRun SDK, because it includes some gstreamer plugins with AAC/MP3. These codecs have been developing by Diego Dompe and Cristina Murillo from RidgeRun.
You can get more information about the AAC/MP3 codecs, and some gstreamer test pipes at: http://www.ridgerun.com/blog/?p=143.
Regards,
Miguel Aguilar
-- Miguel AguilarEmbedded Software EngineerRidgeRun Embedded Solutions