| 摘要 |
An upper limit of a usable range of a VBV buffer is determined from a preset delay time of the VBV buffer and a designated bit rate. A target bit quantity of a picture (i) and a data occupancy quantity of the VBV at the time when a picture (j+1) is coded are calculated, and the target bit quantity T(j) for coding the picture (j) is corrected so that the data occupancy quantity of the VBV of the picture (j+1) constantly falls within the limited range. By this, even when a low coding bit rate is set, the delay due to the VBV buffer of a predetermined delay time or longer does not reach a prescribed delay time or longer. Thus, an MPEG encoder suitable for a live broadcast in which the problem of delay time is not desired can be realized.
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