Transcoder

摘要

In a transcoder, a decoder decodes a stream and an encoder encodes the stream again. The encoder calculates the quantization step value by using an average period bit rate (ASn(M)) of a first stream or an average period bit rate (ACn(M)) of a second stream. Buffers store bit rates (Sn, Cn) of the first and second streams for M periods, respectively. The encoder uses the average period bit rate (ASn(M)) of the first stream or then average period bit rate (ACn(M)) of the second stream in any one of the periods M1, M2 and M3 among M periods.

主权项

1. A transcoder for converting a first stream into a second stream, comprising:
a bit rate acquisition device configured to acquire an average bit rate Sk (k is a natural number) of a first stream in a control unit time Lk; a buffer configured to store average bit rates Sn, Sn−1, . . . , Sn−m+1 (M and n are natural numbers, n>M) obtained in control unit times Ln, Ln−1, . . . , Ln−M+1, respectively, of the first stream in a plurality of past periods corresponding to a plurality of the control unit times, the average bit rates being acquired by the bit rate acquisition device; a reference value calculation device configured to determine a period within the plurality of past periods, the determined period corresponding to P control unit times composed of control unit times Ln, Ln−1, . . . , Ln−p+1 (P is a natural number, P