"I think the rest (of studios) are swinging in favor of our side," said Yamada who is also head of Toshiba's HD DVD development operations.
The other big studios include Walt Disney Co. (DIS) group, Time Warner Inc. (TWX), Universal Studios and Paramount Pictures Corp. (PTP.XX).
If these four studios come to the HD DVD side, "that would effectively mean the end of the game" even before the two sides of different formats roll out their versions of products in late 2005, he said.