title: How to convert flv format into .mp4 format using FFMPEG in php
body: <p>Here I am try to convert <code>.flv</code> video format into <code>.mp4</code> format.
  File converted with <strong>zero size</strong> and it's not played.</p>
  
  <p>I need to successfully convert that file using <code>FFMPEG</code>.</p>
  
  <pre><code>/* Convert type to .mp4 */
  exec("ffmpeg -i input.flv -vcodec copy -acodec copy output.mp4;");
  </code></pre>
  
  <p>Thanks for your advice!</p>