Ffmpeg supports AAC doesn't it patch by (Benjamin Larsson <banan at student dot ltu dot se>)

Originally committed as revision 3280 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffmpeg-doc.texi

@@ -774,6 +774,8 @@ solutions.
 @item Vorbis                 @tab  X   @tab  X
 @tab supported through the external library libvorbis
 @item WMA V1/V2              @tab      @tab X
+@item AAC                    @tab X    @tab X
+@tab supported through the external library libfaac/libfaad
 @item Microsoft ADPCM        @tab X    @tab X
 @item MS IMA ADPCM           @tab X    @tab X
 @item QT IMA ADPCM           @tab      @tab X