HTML5 introduces <audio> and <video> tags to play media files within the HTML documents. HTML5 video is the new standard way to show video on the web without using any plugins, but it has the limitation of supporting different video format for different web browsers and operating systems.
| Browser | MP4 | WebM | Ogg |
| Internet Explorer 9+ | Yes | No | No |
| Chrome | Yes | Yes | Yes |
| Firefox | No Firefox 21 running on Windows 7, Windows 8, Windows Vista, and Android now supports MP4 |
Yes | Yes |
| Safari | Yes | No | No |
| Opera | No | Yes | Yes |
| iOS Safari 3.2 | Yes | No | No |
<video poster="movie.jpg" controls>
<source src="movie.webm" type='video/webm; codecs="vp8.0, vorbis"'>
<source src="movie.ogg" type='video/ogg; codecs="theora, vorbis"'>
<source src="movie.mp4" type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"'>
<p>This is fallback content</p>
</video>
There are some free software available which can convert any video format to HTML5 video format. You can download Miro Video Converter to convert almost any video to MP4, WebM (vp8), Ogg Theora, or for Android, iPhone, and iPad.
Projekktor is a self-hosted, open source video (and audio) player for the web, written in Javascript, released under GPLv3. It simplifies the way you implement and work with web video by solving tons of cross browser- and compatibility- issues, adding eye candy and by providing extremely powerful non standard features. With other words: We try to create the best truely free web media player – period.
HTML5 <audio> or <video> player with Flash and Silverlight shims that mimics the HTML5 MediaElement API, enabling a consistent UI in all browsers.

HTML5 Enables Web Pages to playback and manipulate video and audio across platforms and devices - powering amazing rich-media applications that work everywhere. HTML5video.org is an online community of web developers and the home of the Kaltura open source video player Javascript library.
Codo Player solves the problem of various browser/platform video support mismatches in order to reach maximum possible audience. Offering support for HTML5 / FLASH and even YOUTUBE platforms and providing unified setup, api and user interface.
Video.js is a JavaScript and CSS library that makes it easier to work with and build on HTML5 video. This is also known as an HTML5 Video Player. Video.js provides a common controls skin built in HTML/CSS, fixes cross-browser inconsistencies, adds additional features like fullscreen and subtitles, manages the fallback to Flash or other playback technologies when HTML5 video isn't supported, and also provides a consistent JavaScript API for interacting with the video..
Click here to Know more about FLV/ MP4 Player.