Delivers ogg/theora (and optional webm) html5 video from an external storage location with fallbacks to flash, and links for download.
Important: This plugin is designed to operate on media files hosted outside your WordPress site. It does not integrate with the Media library, and it does not create the media files.
External "Video for Everybody" is a WordPress plugin that you can use to show videos on your WordPress site. You enter a simple shortcode on your page, and the plugin generates the HTML to deliver the media. Browsers that understand the HTML5 tag will display MPEG/H.264 (.mp4) files, VP8/webm (.webm), or Ogg/Theora (.ogv) files. Other browsers can use Flash to play the .mp4. In all cases, the markup includes links to download the media files. The HTML comes with only minor variations straight from the Video for Everybody model. See that site for fuller details.
This plugin is not for everybody, even if the video tries to be. If I were not writing my own plugin, I would probably be using the Degradable HTML5 audio and video Plugin by Pavel Soukenik. My plugin uses and will follow the Video for Everybody approach. I also offer an options page where you can define site-wide default paths and dimensions. The defaults can be overridden in any particular shortcode, but if most of your video resides in the same place and has consistent dimensions, site-wide defaults keep the shortcodes simple. Soukenik's shortcodes give you more control over playback options.
Important: Most autobuffering problems have been settled, but preloading (autobuffering) preferences are supported unevenly in some older browers and versions of browsers. Depending on how many movies you serve on a single page, and on how large they are, autobuffering can significantly slow your clients' browsers, and it can also hit your bandwidth.
For a discussion of autobuffering in html5 see: http://daringfireball.net/2009/12/html5_video_unusable