Thread:Extension talk:HTML5video/configured HTML5video.php for poster attribute

html5 allows a  attribute to the   tag.

A simple php update allows this extension to make use of it. Might want to add this to the next version:

then just swap your jpeg into the same folder as your vid's, add  to your   tag, and  voila.

P.S.: the URL in the extension credits is meant to be a direct link to the extension itself.
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PPS: If you're using server caching like APC, don't forget to reload the webserver.