title: FFMPEG: AAC Number of bands exceeds limit
body: <p>I am using the FFMPEG C API to decode the audio in an MP4 file.</p>
  
  <p>My code works when decoding an OGG or MP3 file, but fails on the first frame of AAC audio in an MP4</p>
  
  <p>I get this error from </p>
  
  <pre><code>avcodec_send_packet(codecContext, packet)
  
  [aac @ 0x7f80eb9e3a00] Number of bands (31) exceeds limit (5)
  </code></pre>
  
  <p>What is the "number of bands" and how do I increase it?  What does this message really mean?</p>
  
  <p>Thank you in advance</p>