发明名称 |
Control of rate of change of buffer occupancy in video splicing |
摘要 |
Decoders A and B decode MPEG-2 bitstreams A and B. A switch (S2) switches from decoded stream A to decoded stream B to achieve a splice. The resulting bitstream is re-encoded in an encoder 4. A new transitional GOP is defined beginning at the splice. The new GOP is defined by picture type decision rules which may have the effect of changing the GOP compared to the GOPs of streams A and B. The new GOP provides an initial prediction of the position in stream B where the occupancy value of stream C should coincide with that of B. A target for the new number of bits in the new GOP is calculated as the sum of the normal allocation of bits for the new GOP plus the difference between the occupancy value of stream C at the splice and a prediction of the occupancy of stream B at the predicted position. The occupancy value of stream C is controlled in accordance with the target so that it tends toward the occupancy value of stream B at the predicted position, at a rate not exceeding a predetermined maximum. |
申请公布号 |
GB2353653(A) |
申请公布日期 |
2001.02.28 |
申请号 |
GB19990020274 |
申请日期 |
1999.08.26 |
申请人 |
* SONY UNITED KINGDOM LIMITED |
发明人 |
NICHOLAS IAN * SAUNDERS;ROBERT MARK STEFAN * PORTER |
分类号 |
G11B27/032;G11B27/036;H03M7/30;H04N7/24;H04N7/26;H04N7/50 |
主分类号 |
G11B27/032 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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