title: ffmpeg compresses upto 32 kbps only
body: <p>I have created a PHP code which compresses mp3 while uploaded to 32kbps bit rate I have referred this thread</p>
  
  <p><a href="https://stackoverflow.com/questions/4628221/how-to-compress-or-convert-to-low-quality-mp3-file-from-php">How to compress or convert to low quality Mp3 file from PHP</a></p>
  
  <p>used this code</p>
  
  <pre><code>exec("ffmpeg -i inputfile.mp3 -ab 24000 outputfile.mp3") 
  </code></pre>
  
  <p>but the problem is I can't compress more than 32kbps .my code instruct to compress up to 24kbps but after execution, I can see the output file is 32kbps. can anyone tell what should I do so that I can compress more than 32kbps .or is there any limitation of ffmpeg ??</p>