VP8

VP8. It is an open and royalty-free video compression format developed by On2 Technologies and later released as open source by Google in 2010. The codec became a central component of the WebM project, designed to provide a high-quality alternative for HTML5 video on the open web. Its release sparked significant discussion within the multimedia industry, particularly concerning web standards and digital rights.

Technical overview

The format employs a block-based discrete cosine transform architecture similar to other contemporary codecs like H.264/MPEG-4 AVC. Key technical features include variable block-size motion compensation, bilinear filtering, and an in-loop deblocking filter to reduce visual artifacts. It uses predictive coding for intra-frames and supports key frames for random access in streaming. The bitstream syntax was designed to be simpler to decode than many competing formats, aiming for efficient implementation on devices like those using the ARM architecture.

Development history

The technology originated as the successor to VP7 at On2 Technologies, a company known for its series of TrueMotion codecs. Following its acquisition by Google in 2010, the source code was publicly released under a BSD license as part of the launch of the WebM project. Major technology partners, including Mozilla, Opera Software, and Adobe Systems, initially endorsed the initiative. The development library, libvpx, is maintained by the Alliance for Open Media and continues to receive optimizations for platforms like Android.

Patent and licensing issues

Upon its release, Google provided an irrevocable patent promise for any of its owned patents essential to implementation. However, initial claims of potential patent infringement from holders of MPEG LA patents, particularly those related to H.264/MPEG-4 AVC, created uncertainty. This led to a formal patent challenge by Nokia in courts in the United States and Germany. These disputes were a focal point in the broader "codec wars" and influenced the formation of the patent-averse Alliance for Open Media.

Adoption and usage

Its primary adoption vector was through the WebM container format, which gained support in major web browsers like Google Chrome, Mozilla Firefox, and Opera. It was once a mandatory codec for WebRTC implementations, as standardized by the Internet Engineering Task Force. While used in services like YouTube and Google Hangouts, its widespread deployment was later superseded by more efficient successors. Certain hardware vendors, including Texas Instruments and Broadcom, produced system on a chip designs with decoding acceleration.

Comparison with other codecs

When initially released, it was positioned as a direct competitor to the ubiquitous H.264/MPEG-4 AVC, often benchmarked for quality at similar bitrates in studies by organizations like the Mozilla Corporation. Generally, it was considered roughly comparable in efficiency for many use cases but lagged behind in performance for high-resolution content. Its successor, VP9, and later AV1, offered substantial improvements, while High Efficiency Video Coding from the Moving Picture Experts Group maintained a strong lead in the licensed codec space. Its role was pivotal in demonstrating the viability of open, royalty-free video formats for the World Wide Web.

Category:Video codecs Category:Free video codecs Category:Google services