| 摘要 |
The present invention restricts a method of assigning unit identification numbers when parameter sets are arranged in a stream. This makes it possible to simplify a decode process and to increase the speed of the process. In a stream containing a plurality of picture units, a plurality of picture parameter units, and a plurality of system parameter units, the units being arranged in the direction of time series, if a plurality of units have the same parameter set contents, the same unit identification number is assigned to the units. If the parameter set contents of the unit referenced by the preceding unit are different from those of the unit referenced by the next current unit, the unit referenced by the current unit is provided with a unit identification number different from that for the preceding unit.
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