A system and a method for facilitating transitions between video streams is provided. When there are two or more successor basic blocks to a basic block, a given variable is live at the entry of one or more of the successor basic blocks, and the variable is dead in another basic block S, a new basic block is inserted between the original basic block and a successor basic block in which the variable is dead, and RC\u2212 related to the variable is generated in the new basic block. The skin material is a laminate including, in succession, a PVC layer, a knitted fabric and a closed-cell synthetic resin foam.