There is no complete G.729 decoder in libavcodec.

Originally committed as revision 26085 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/general.texi

@@ -599,7 +599,6 @@ following image formats are supported:
 @item DV audio               @tab     @tab  X
 @item Enhanced AC-3          @tab     @tab  X
 @item FLAC (Free Lossless Audio Codec)  @tab  X  @tab  IX
-@item G.729                  @tab     @tab  X
 @item GSM                    @tab  E  @tab  X
     @tab encoding supported through external library libgsm
 @item GSM Microsoft variant  @tab  E  @tab  X