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    <p><strong>tl;dr</strong> Browsers <strong>really</strong> use the OS to perform some media decoding tasks. Work around it by <strong>a)</strong> providing alternate media streams <strong>b)</strong> using the most compatible media format for your audience <strong>c)</strong> using a plugin (i.e. Flash), or <strong>d)</strong> recommend installing an MP4 plugin.</p> <p>This is in fact a 'problem' with the OS. Many browsers, just as some other programs on a particular platform, use the operating system resources to acomplish a given task. This is particularly true when it comes to procedures protected by intellectual property rights. </p> <p>Your codec (h.264 aka "MP4") happens to be a particulary fiercely fought over piece of IP. Thus, browsers don't go to lengths to licence the IP at hand, but rather use the licenced codecs of the host system. </p> <p>In your case, Windows XP happens not to be able to decode the media format of your video, and the browser doesn't seem to be able to do that by itself.</p> <p>Your alternatives now: </p> <ul> <li>Give additional media streams with your <code>video</code> tag (see <a href="http://en.wikipedia.org/wiki/HTML5_video#.3Cvideo.3E_element_examples" rel="nofollow">Wikipedia</a> for an example)</li> <li>Trying to find out what <em>browser</em> the majority of users is using on XP, then choose a natively supported format (either <code>webm</code> for Chrome or <code>ogg</code> for Firefox)</li> <li>Just use Flash to play the MP4 (as in the pre-HTML5 days)</li> <li>Telling users to install an OS-level plugin to play h.264; you could even do that in the fallback text. I won't recommend a specific product, but there are many.</li> </ul>
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    1. POknitr mp4 movie embedding does not work on Windows XP
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    1. COThanks a lot. It works well with a `webm` video and the Chrome browser: http://stla.overblog.com/ellipse-chart-test2
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      1. USStéphane Laurent
    2. CO@StéphaneLaurent Cool, thanks for the feedback.
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