STATISTICAL MULTIPLEXER AND REMULTIPLEXER THAT ACCOMMODATES CHANGES IN STRUCTURE OF GROUP OF PICTURES

摘要

Multi-system for the control of the ratio of the transcoding and the encoding of the digital video data of the program transmission environment, for example to accommodate changes in the GOP structure of a program by inserting commercials. The hierarchical bit allocation configuration is used, in which bits are allocated in a super GOP level 106, that is, the grouping of multiple GOP, the superframe level (104), and individual frame level (102). Bit allocation for a super GOP and each picture is adjusted when a change in the structure of the GOP is detected in which the line extraction program. In addition, the super GOP length is adjusted, if need to maintain a constant GOP therein. Changing the GOP structure is detected based on changes in the GOP length or sub _GOP length (distance between P-pictures). In the case of compressed line data, initial GOP length and the sub _GOP length it may be adjusted as needed, is estimated based on the actual measurement. If the current I or P-picture, the sub-_GOP length is calculated on the basis of the time reference of the current picture and the previous I or P pictures. If the current B picture, the same calculation is used, it added to a single picture.