Google opens up VP8 for Web video tweaks

From CNET News.com: One month after releasing its open-source, royalty-free VP8 video compression technology, the company already is working on significant revisions to the technology.

VP8, combined with the Vorbis audio technology, form the WebM codec with which Google is trying to unfetter Web video from the patent and royalty encumbrances of rival codec H.264. To make WebM a stronger competitor, Google is beginning work not just on ways to speed up encoding and decoding of the VP8, but also deeper changes to the format itself.

"Like every codec, WebM is not immune to change; the difference in our project is that the improvements are publicly visible, and compatibility and implementation issues can be worked through in an open forum," said Google codec engineering manager Jim Bankoski in a blog post Thursday. "To maintain codec stability while also allowing for quality and performance improvements in VP8, we have added an experimental branch to the VP8 source tree."

The experimental work will affect the bitstream--the exact sequence of encoded information that represents the video stream. Changing its design means a decoder essentially would see gibberish, so decoders won't play the video unless they're compatible and set specifically to show the experimental format.

Software decoders can be updated relatively easily, but part of the promise of VP8 is hardware support that can improve video performance characteristics such as frame rate and resolution and can lower power consumption. And hardware takes longer to change.

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