Video encoding control method, video encoding apparatus, and video encoding program

摘要

A video encoding control method encodes an input video signal by controlling a generated bit rate so a hypothetical buffer in a decoder does not overflow or underflow includes: 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; 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 the quantization statistic exceeds a predetermined threshold value, and if the quantization statistic exceeds the predetermined threshold value, changing the encoding parameter so 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.

主权项

1. 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 overflow or underflow, the method comprising utilizing a processor and a memory device storing instructions causing the processor to execute the following operations:
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; 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 the quantization statistic exceeds a predetermined threshold value; and 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, wherein when sequentially encoding, each picture in the encoding-order picture group is sequentially encoded in accordance with an encoding parameter set depending on a retry count indicating the number of times of the re-encoding, and when performing the re-encoding, the retry count is incremented if the quantization statistic exceeds the predetermined threshold value and the encoding parameter is changed to an encoding parameter with which the generated bit rate resulting from encoding is reduced as the value of the retry count increases.