libavformat/flvenc.c:235: error: Uninitialized Value
  The value read from audiocodecid was never initialized.

libavformat/flvenc.c:235:9: 
233. 
234.         put_amf_string(pb, "audiocodecid");
235.         put_amf_double(pb, audiocodecid);
             ^
236.     }
237. 
