title: ffmpeg overwrite output file if exists
body: <p>I ran:</p>
  <pre><code>ffmpeg -i input.flac output.mp3
  </code></pre>
  <p>This prompts:</p>
  <blockquote>
  <p>File 'output.mp3' already exists. Overwrite? [y/N] y</p>
  </blockquote>
  <p>How do I automatically say &quot;yes&quot;?</p>