IE-8 Flash后备广告可以离线运行，但不能在线运行

Question

For some unknown reason under IE-8 the flash fallback only works when running the site/page from the local file system (file://). When running online(htttp://) from an IIS server with mime types configured for MP4 the video won't load in IE-8. Chrome does however load the video correctly both offline and online.

Flash fallback error: "FLASH: srcnotfound" is shown onscreen.

The video src is dynamically populated via javascript after the page has loaded and repopulated with a different src after a different video is clicked. I've verified via chrome and offline that the video src (which is a relative path) is accurate.

HTML

<video id="Video1" class="video-js vjs-default-skin vjs-big-play-centered" controls preload="auto" width="1010" height="568.125">
<source src="" type='video/mp4' />
<p class="vjs-no-js">Please enable JavaScript, and consider upgrading to a browser that supports HTML5 video</p>
</video>

Javascript

function LoadVideo(vidSrc){
    //Initialize Video.js library
    videojs("Video1", {"autoplay":true}, function(){
        this.src([{type: "video/mp4", src: vidSrc}]);
        this.play();
    });
}

Answer 1

IE9 and later using an emulation mode of IE8 and lower (compatibility view) will ignore <video> tags.

To provide flash fallback, nest object inside your video tags.

<video>

<object> Your useragent does not support common video formats. </object>

</video>

additionally userAgents can disable flash content... ActiveX filtering, no-flash addons for webkit and gecko... etc...