Variance Adaptive Quantization
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Variance Adaptive Quantization (VAQ) is a video encoding technique that was first introduced in H.264 (MPEG-4 AVC). It is intended to be a supplement to make up for the earlier limitations in eg. Xvid's Adaptive Quantization mode. However, some lobbyist coder wrote a patch[1] that brought the VAQ enhancement into the main Xvid library (xvidcore.dll). The first "patched" Xvid library of this kind was available in February 2008.
References
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