title: Use webengine video and audio codecs
body: <p>For my PyQt5 project, I am using the <code>QWebEngineView</code>, but certain videos, such as <code>.mp4</code> videos won't play. Can I install the codecs with <code>pip</code>, or pass a certain argument through <code>QApplication()</code> or something similar in order to fix this problem?</p>
  
  <p>I installed PyQt5 through <code>pip</code>, so I don't have the <code>C:\Qt\...</code> files, only the <code>PyQt5</code>, <code>pyqt5_tools</code> folders in <code>Appdata\Local\Programs\Python\Python37\Lib\site-packages</code>.</p>
  
  <p>I am using <code>Python 3.7.2</code>, and <code>PyQt5.11</code></p>