ffmpeg encoder question

[jd1008]

$ ffmpeg -i audfile1.wav -aq 9 -y audfile1.mp3
ffmpeg version N-72985-g7c3f7e6 Copyright (c) 2000-2015 the FFmpeg 
developers
   built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
   configuration: --prefix=/opt
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 41.100 / 56. 41.100
   libavformat    56. 37.100 / 56. 37.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 17.100 /  5. 17.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from 'MMY-Q+A.wav':
   Duration: 01:32:46.17, bitrate: 1411 kb/s
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 
channels, s16, 1411 kb/s
Output #0, mp3, to 'MMY-Q+A.mp3':
     Stream #0:0: Audio: mp3, 0 channels, 128 kb/s
Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le (native) -> ? (?))
Encoder (codec mp3) not found for output stream #0:0

So, I have the following rpms for codecs:

codec2-0.3-5.20150317svn2080.fc20.x86_64
mplayer-codecs-extra-20061022-1.x86_64
apache-commons-codec-1.8-5.fc20.noarch

What else is missing?