[MPlayer-dev-eng] libamr_nb

[turbos10]

Hi!
I compile mplayer under windows.
in 3gp files i see:
  Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
  Cannot find codec 'libamr_nb' in libavcodec...
  ADecoder init failed :(
  ADecoder init failed :(
  Cannot find codec for audio format 0x726D6173.
Why my mplayer not support FFmpeg amr_nb using ffmpeg. ffdshow suport
amr_nb. Must i install libamr_nb manually?