US Patent 7924915 Method and system for encoding video data

Described herein is a rate controller in a video system. The rate controller is comprised of a complexity estimator, a quantization level selector, a complexity generator, and a complexity estimate updater. The complexity estimator generates a complexity metric estimate. The quantization level selector sets a quantization level based on the complexity metric estimate. The complexity generator generates an actual complexity metric. The complexity estimate updater generates an updated complexity metric estimate based on a difference between the complexity metric estimate and the actual complexity metric.