title: Convert audio-only flv to aac: ffmpeg
body: <p>I can't convert a simple audio-only .flv to AAC format. The audio stream is obviously there, and I can hear it on manual playback. Are there different parameters I need to accomplish this?</p>
  
  <pre><code>ffmpeg -i test.flv test.aac
  [flv @ 0x23b3260]Could not find codec parameters (Video: 0x0000)
  Input #0, flv, from 'test.flv':
    Duration: 00:00:12.95, start: 0.000000, bitrate: N/A
      Stream #0.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
      Stream #0.1: Audio: nellymoser, 8000 Hz, mono, s16
  Output #0, adts, to 'test.aac':
      Stream #0.0: Audio: 0x0000, 8000 Hz, mono, s16, 64 kb/s
  Stream mapping:
    Stream #0.1 -&gt; #0.0
  Unsupported codec for output stream #0.0
  </code></pre>