Here are 20 100% HTML5 based and do not required Flash or any other ActiveX controls to render videos which allow you to easily embed video into web pages and ensure backwards compatibility. Those free tools available that will let you serve video via HTML5 and also support Flash, in the event that a visitor’s browser doesn’t support HTML5 (or in some cases, the video codec being used with your HTML5 code).
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Acorn Media Player is a jQuery plugin for creating accessible, highly customizable, and themeable HTML5 video & audio players on your web page.
YTPlayer is a jQuery plugin that allows you to use a youtube video as the background of your web page using html5 data-* attributes and youtube API. You can also use this plugin as a normal video player for your web page.
Solid player with a pretty design. Flash fallback lacks stylable controls, though. Plus, the player has no public API for scripted usage. Plugins for WordPress, Joomla and Drupal coming soon.
The design defaults to jQuery UI, which is pragmatic but ugly. Mediocre player with no special joy.
The docu is a bit messy, but the player seems okay. Has been developed for the MediaWiki CMS. Furthermore, Adobe uses Kaltura as a module within their AIR ecosystem.
Documented API, commercial version for custom branding. They even have plugins like 'share' and some more in their pipeline.
Akamai’s Open Video Player for HTML5