Video coding control method, video coding device, and video coding program

Abstract

Video encoding is realized with small deterioration in image quality while suppressing underflow of a coded picture buffer (CPB) and with a smaller calculation amount than conventional 2-pass encoding. A video encoding control method which encodes an input video signal by controlling a generated bit rate so that a hypothetical buffer in a decoder does not fail includes: a step of sequentially encoding each picture in an encoding-order picture group in accordance with a predetermined encoding parameter, the encoding-order picture group including a predetermined number of pictures and being a collection of successive pictures in the order of encoding; a step of calculating a quantization statistic of each picture based on quantization parameter information used to encode each picture each time each picture is encoded, and checking whether or not the quantization statistic exceeds a predetermined threshold value, and a step of if the quantization statistic exceeds the predetermined threshold value, changing the encoding parameter so that the generated bit rate resulting from encoding is reduced and performing re-encoding from a first picture of an encoding-order picture group that is being encoded using the changed encoding parameter.

Description

technical field [0001] The present invention relates to a moving picture coding technique for coding a video signal so that a virtual buffer such as a coded picture buffer (CPB: Coded Picture Buffer) in a virtual decoder does not fail and the deterioration of the picture quality does not increase. . [0002] This application is directed to Japanese Patent Application No. 2010-109874, Japanese Patent Application No. 2010-109875, Japanese Patent Application No. 2010-109876, Japanese Patent Application No. 2010-109877, Japanese Patent Application No. 2010-109877, which were filed in Japan on May 12, 2010 Application No. 2010-109878 claims priority, and the contents thereof are incorporated herein by reference. Background technique [0003] In the encoding of video signals, it is necessary to encode in such a way that the decoder does not fail. The H.264 encoding method defines a virtual decoder HRD (Hypothetical Reference Decoder) that models a decoder. The encoder for H.264...

AI Technical Summary

Problems solved by technology

However, since this method encodes all frames of the input video twice, there is a problem that a large amount of computation is required

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