Variance Adaptive Quantization

Variance Adaptive Quantization (VAQ) is a video encoding algorithm that was first introduced in the open source video encoder x264. According to Xvid Builds FAQ: "It's an algorithm that tries to optimally choose a quantizer for each macroblock using advanced math algorithms."[2] It was later ported to programs which encode video content in other video standards, like MPEG-4 ASP or MPEG-2.

"VAQ" redirects here. For other uses, see List of units of the United States Navy ยง Commander, Electronic Attack Wing, Pacific.
Visual quality gain in x264:[1]
Without VAQ
With VAQ

In the case of Xvid, the algorithm is intended to make up for the earlier limitations in its Adaptive Quantization mode. The first Xvid library containing this improvement was released in February 2008.[3]

References
  1. The first in-depth technical analysis of VP8 Archived 2012-02-09 at the Wayback Machine, Fiona Glaser, 05/19/2010
  2. Xvid Builds FAQ
  3. "VAQ: Making Xvid's Adaptive Quantization Not Suck"
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