title: FFMPEG amr to mp3 conversion problem
body: <p>Hey all, I'm having the following issue converting amr files to mp3 files. When I try to do the converstion I get the following:</p>
  
  <pre><code>FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
    built on Jan 24 2011 12:00:26 with gcc 4.4.5
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    libavutil     50.36. 0 / 50.36. 0
    libavcore      0.16. 1 /  0.16. 1
    libavcodec    52.108. 0 / 52.108. 0
    libavformat   52.93. 0 / 52.93. 0
    libavdevice   52. 2. 3 / 52. 2. 3
    libavfilter    1.74. 0 /  1.74. 0
    libswscale     0.12. 0 /  0.12. 0
    libpostproc   51. 2. 0 / 51. 2. 0
  </code></pre>
  
  <p>Test.amr: Invalid data found when processing input</p>
  
  <p>It's actually weird considering i have another file recorded earlier and the conversion works as you can see here:</p>
  
  <pre><code>octavius@octavius-VirtualBox:~/share$ ffmpeg -i 1-aloalodwd.amr 1-aloalodwd.mp3
  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
    built on Jan 24 2011 12:00:26 with gcc 4.4.5
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    libavutil     50.36. 0 / 50.36. 0
    libavcore      0.16. 1 /  0.16. 1
    libavcodec    52.108. 0 / 52.108. 0
    libavformat   52.93. 0 / 52.93. 0
    libavdevice   52. 2. 3 / 52. 2. 3
    libavfilter    1.74. 0 /  1.74. 0
    libswscale     0.12. 0 /  0.12. 0
    libpostproc   51. 2. 0 / 51. 2. 0
  [amr @ 0x9c0c4e0] Estimating duration from bitrate, this may be inaccurate
  Input #0, amr, from '1-aloalodwd.amr':
    Duration: N/A, bitrate: N/A
      Stream #0.0: Audio: amrnb, 8000 Hz, 1 channels, flt
  Output #0, mp3, to '1-aloalodwd.mp3':
    Metadata:
      TSSE            : Lavf52.93.0
      Stream #0.0: Audio: libmp3lame, 8000 Hz, 1 channels, s16, 64 kb/s
  Stream mapping:
    Stream #0.0 -&gt; #0.0
  Press [q] to stop encoding
  size=      26kB time=3.38 bitrate=  64.1kbits/s    
  video:0kB audio:26kB global headers:0kB muxing overhead 0.121897%
  </code></pre>
  
  <p>Any idea as to what might be happening?</p>