title: Is it possible to change volume with no reencode with ffmpeg?
body: <p>I just had this question because I used the following command with ffmpeg:</p>
  
  <pre><code>ffmpeg -i input.wav -filter:a "volume=0.2" output.wav
  </code></pre>
  
  <p>Following the documentation here: <a href="https://trac.ffmpeg.org/wiki/AudioVolume" rel="nofollow noreferrer">https://trac.ffmpeg.org/wiki/AudioVolume</a></p>
  
  <p>However, when I created the new file, the output was half the size of the input and the bitrate of the audio track was reduced as well.</p>
  
  <p>So my questions are:</p>
  
  <ol>
  <li>Is the bitrate supposed to decrease with decreasing and increasing volume like so?</li>
  <li>Is it possible to change volume without reencoding with ffmpeg?</li>
  </ol>