Google officially announced the forthcoming release of an open source, royalty-free video format called WebM. Using the VP8 codec that Google acquired from On2 last February, the format is backed by fellow browser makers Mozilla and Opera.
How to PLay WebM video
If you want to try WebM , the open video format released by Google, you first need a browser that supports it. For now, WebM is not supported in a stable version of a browser, but you can install a Firefox nightly build or an Opera build. I download Opera 10.54, which is more stable than the nightly builds of Firefox.
After installing the browser, go to YouTube's HTML5 experiment and click on "join HTML5 beta". To find videos that are available in the WebM format, use YouTube's search feature and append &webm=1 to the URL, like this: http://www.youtube.com/results?search_query=web&webm=1.
Click on a video and you'll notice that YouTube no longer uses Flash or H.264. There's even a messages that makes the video player more cluttered: "HTML5 * WEBM".
While WebM is not currently part of the HTML5 spec, it will be added as a supported part of the
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