title: How to change Chromes media device API
body: <p>I am trying to acces a webcam through WebRTC in Chrome.</p>
  
  <p>Everything works on most PCs but on some it just shows a black screen.
  Drivers and everything is installed and a little test program from the webcam manufacturer shows a video stream on all PCs.</p>
  
  <p>In Chrome under chrome://media-internals you can look up some information about the media devices used in chrome.
  On the PCs, that show a valid video stream, Chrome is using Direct Show as the device API. On the PCs, that show a black screen, Chrome is using Media Foundation as the device API.</p>
  
  <p>How can I change the device API Chrome is using to acces the webcam?</p>