title: The length is decreased on overwriting an mp3 file using FFmpeg command
body: <p>I am trying to compress an audio file and I use <code>-y</code> command to overwrite the existing file. But problem is that that command decreases the duration of the audio file.</p>
  
  <p>I am using the following command:</p>
  
  <pre><code>ffmpeg -y -i D:\audio\Blues.mp3 -ab 64 D:\audio\Blues.mp3
  </code></pre>
  
  <p>Is there any way to resolve this within <code>ffmpeg</code>? Thanks.</p>