That's true Wysota,but I did the above because <video> tag seems to not working too.

Qt Code: 
  1. <!-- <video controls>
  2. 	<source src="ArchitectVideo_dvd.ogv" type="video/ogg">	
  3. 	</video> -->
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This is how my code was during 1st attempt to play a video in QWebView.
Also,from what I know there will be issues to play .avi files via <video> tag,and that possibility is highly demanded in my application.