20-40% (average 28%) improvement in libvpx decoder speed

Over 7% overall PSNR improvement (6.3% SSIM) in VP8 "best" quality encoding mode, and up to 60% improvement on very noisy, still or slow moving source video.









Single-core assembly "hot spot" optimizations, including improved vp8_sixtap_predict() and SSE2 loopfilter functions

Threading improvements for more efficient use of multiple processor cores

Improved memory handling and reduced footprint

Combining IDCT and reconstruction steps

SSSE3 usage in functions where appropriate

Adaptive width and strength alternate reference frame noise suppression filter with optional motion compensation.

Transform improvements (improved accuracy and reduction in round trip error)

Trellis-based quantized coefficient optimization

Two-pass rate control and quantizer changes

Rate distortion changes

Zero bin and rounding changes

Work on MB-level quality control and bit allocation

Today we're making available "Aylesbury," our first named release of libvpx, the VP8 codec SDK. VP8 is the video codec used in WebM. Note that the VP8 specification has not changed, only the SDK.What's an Aylesbury? It's a breed of duck . We like ducks, so we plan to use duck-related names for each major libvpx release, in alphabetical order. Our goal is to have one named release of libvpx per calendar quarter, each with a theme.You can download the Aylesbury libvpx release from our Downloads page or check it out of our Git repository and build it yourself. In the coming days Aylesbury will be integrated into all of the WebM project components (DirectShow filters, QuickTime plugins, etc.). We encourage anyone using our components to upgrade to the Aylesbury releases.For Aylesbury the theme was. We used our May 19, 2010 launch release of libvpx as the benchmark. We're very happy with the results (see graphs below):The main improvements to the decoder are:On the encoder front, we concentrated on clips in the 30-45 dB range and saw the biggest gains in higher-quality source clips (greater that 38 dB), low to medium-motion clips, and clips with noisy source material. Many code contributions made this possible, but a few of the highlights were:We're targeting Q1 2011 for the next named libvpx release, which we're calling Bali . The theme for that release will be. We are constantly working on improvements to video quality in the encoder, so after Aylesbury we won't tie that work to specific named releases.Members of the WebM project will discuss Aylesbury during a session at the Streaming Media West conference on November 3rd (session C203: WebM Open Video Project Update). For more information, visit www.streamingmedia.com/west