VIDEO ENCODING AMOUNT CONTROL METHOD, VIDEO ENCODING AMOUNT CONTROL DEVICE, VIDEO ENCODING AMOUNT CONTROL PROGRAM, AND COMPUTER READABLE RECORDING MEDIUM ON WHICH SAID PROGRAM IS RECORDED

摘要

A video bitrate control method and apparatus that control a generated bitrate of a picture to be encoded, based on an initial value of an allocation bitrate that is previously given to each picture are provided, wherein a difference between an allocation bitrate and an actually generated bitrate of a picture that has been encoded is obtained as an error bitrate, one of a maximum value and a minimum value of the allocation bitrate is selected for a plurality of subsequent pictures, as an allowable correction range, based on the sign of the error bitrate, the maximum value and the minimum value of the allocation bitrate being calculated based on the initial value of the allocation bitrate and a previously given constant, a difference between the allowable correction range and the allocation bitrate is obtained for the plurality of pictures, as an allowable variation bitrate, the ratio of the sum of allowable variation bitrates and the error bitrate is obtained as an update rate, a variation bitrate for the allocation bitrate is calculated for the plurality of pictures based on the allowable variation bitrate and the update rate, and the allocation bitrate of each of the plurality of pictures is updated based on the variation bitrate.