Patent ID: 8548042
Filing Date: 2013-10-01
Classification: H04N

Abstract:
1. A video bitrate control method that controls 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, the method comprising: a step of obtaining a difference between an allocation bitrate and an actually generated bitrate of a picture that has been encoded, as an error bitrate; a step of selecting, for a plurality of subsequent pictures, one of a maximum value and a minimum value of the allocation bitrate, 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 from the initial value of the allocation bitrate and a previously given constant; a step of obtaining, for the plurality of pictures, a difference between the allowable correction range and the allocation bitrate, as an allowable variation bitrate; a step of obtaining the ratio of the sum of allowable variation bitrates and the error bitrate, as an update rate; and a step of calculating, for the plurality of pictures, a variation bitrate for the allocation bitrate based on the allowable variation bitrate and the update rate, and updating the allocation bitrate of each of the plurality of pictures based on the variation bitrate.