有谁能告诉我为什么以下网站的“MockUps”部分下的视频会在Chrome中运行但不在IE9中运行？
我使用html5来实现视频
http://homepages.shu.ac.uk/~a8025613/Index.html
视频元素的编码如下：
<video id=0 controls width=320 height=240>
<source src="House_1/House_1.ogv" type='video/ogg; codecs="theora, vorbis"'/>
<source src="House_1/House_1.webm" type='video/webm' >
<source src="House_1/House_1.mp4" type='video/mp4'>
<p>Video is not visible, most likely your browser does not support HTML5 video</p>
</video>