title: the sound don't stop when QWebView window closed (loaded with youtube video)
body: <p>I load a youtube video with QWebView by the following code ,when the video is playing I close the QWebView window ,but I still can hear the voice from that video even when QWebView window is closed,
  so is there any way to stop the sound by code when QWebView window is closed ?</p>
  
  <pre><code>from PyQt4.QtCore import *
  from PyQt4.QtGui import *
  from PyQt4.QtWebKit import *
  
  import sys
  
  app = QApplication(sys.argv)
  
  view = QWebView()
  
  view.resize(1230,760)
  view.settings().setAttribute(QWebSettings.PluginsEnabled, True)
  
  view.load(QUrl("http://www.youtube.com/v/nKIu9yen5nc")) #
  #
  view.show()
  
  sys.exit(app.exec_())
  </code></pre>