RATE CONTROL IN VIDEO ENCODING

摘要

A video encoder and method of video encoding are provided. At an encoding stage a selected degree of quantization is applied to the encoding of macroblocks of the input video sequence and quantized part-encoded macroblocks are generated. Quantization circuitry in the encoding stage is configured to select the selected degree of quantization for each macroblock in a current slice in dependence on a complexity estimate indicative of the expected entropy encoding complexity of a predetermined set of the quantized part-encoded macroblocks defined for that macroblock.

主权项

1. A video encoder configured to perform a video encoding process comprising receiving an input video sequence and encoding the input video sequence on a slice-basis into an output bitstream, the video encoder comprising:
an encoding stage comprising quantization circuitry configured to apply a selected degree of quantization to the encoding of macroblocks of the input video sequence to generate quantized part-encoded macroblocks, wherein the quantization circuitry is configured to select the selected degree of quantization for each macroblock in a current slice in dependence on a complexity estimate indicative of the expected entropy encoding complexity of a predetermined set of the quantized part-encoded macroblocks defined for that macroblock and does not depend on quantized part-encoded macroblocks outside the predetermined set, and wherein for at least one macroblock of the current slice the predetermined set does not include all previous output bitstream order macroblocks of the current slice.