Index: libavformat/flvenc.c
===================================================================
--- libavformat/flvenc.c	(revision 16847)
+++ libavformat/flvenc.c	(working copy)
@@ -224,6 +224,9 @@
     }
 
     if(audio_enc){
+        put_amf_string(pb, "audiodatarate");
+        put_amf_double(pb, audio_enc->bit_rate / 1024.0);
+
         put_amf_string(pb, "audiosamplerate");
         put_amf_double(pb, audio_enc->sample_rate);