title: Can ffmpeg convert audio to raw PCM? If so, how?
body: <p>I'm currently using <code>ffmpeg</code> to convert <code>FLV/Speex</code> to <code>WAV/pcm_s16le</code>, successfully.  However, I now need the output format to be RAW, that is, PCM signed 16-bit little endian, without the WAV header.  I tried the following:</p>
  
  <pre><code>ffmpeg -y -i input.flv -vn -acodec pcm_s16le output.raw
  </code></pre>
  
  <p>But ffmpeg responds with:</p>
  
  <pre><code>Unable to find a suitable output format for 'output.raw'
  </code></pre>
  
  <p>I also tried using <code>output.pcm</code> and <code>output</code> as output file names, with the same result.</p>
  
  <p>I also tried the <code>-f</code> flag to specify raw format, but that gives:</p>
  
  <pre><code>Unknown input or output format: raw
  </code></pre>
  
  <p>Is this possible with FFmpeg?  If so, how?</p>