Hollywood studios are becoming deeply divided over which high-definition technology will replace the DVD, increasing prospects that it will be years before next-generation players become standard equipment in U.S. households.

Paramount Pictures and DreamWorks Animation SKG Inc signed exclusivity deals to distribute their next-generation discs on Toshiba Corp's HD DVD format for the next 18 months, a move that evened a contest where Sony Corp's Blu-Ray Disc appeared to be pulling ahead.

Paramount expected the lower-priced HD DVD players, which start at $299 compared with $499 for Blu-Ray, to tempt consumers more this holiday season when summer box office blockbusters are released on high-definition DVD.

But the Walt Disney Co , a Blu-Ray supporter, has sent a traveling road show to the top eight U.S. shopping malls to promote Blu-Ray players to those looking to upgrade.

Eight of the 15 top-grossing films of the year, including "Shrek the Third," "Transformers" and "Harry Potter and the Order of the Phoenix" were released by studios that distribute exclusively on HD DVD or on both formats.

Tom Adams, president of Adams Media Research, said the 18-month period of exclusivity for HD DVDs at the two studios comes during slow but growing sales for the new technology and will have little impact on consumers.

"It was going to be a more sedate transition in our view anyway," Adams said. "That's one reason that a period of exclusivity didn't sound too terrifying to the studios."

Preliminary estimates compiled by Adams Media Research show that about 1.5 million U.S. households can play Blu-Ray discs on Sony PlayStations 3 video game machines or dedicated players, versus about 300,000 households whose Microsoft XBoxes or dedicated players are HD DVD compatible.

Sony has dominated high-definition software sales as well, selling twice as many discs as HD DVD in the United States.

The two formats are nearly at parity in the number of titles each has released -- about 200, according to Digital Entertainment Group data.

Despite Sony's early edge, Adams and others warn it is simply too early to tell which format will prevail.

Adams expects HD DVD to be ahead in 2008, in terms of dedicated players, capturing about 1.1 million U.S. households, compared with 900,000 households with dedicated Blu-Ray players.

PriceWaterhouseCoopers also expects to wait several years for a winner to emerge and give large numbers of U.S. consumers confidence to buy.

"Relatively few stand-alone (high definition) players have been purchased, which suggests that the presence of two incompatible ... standards could be inhibiting the market," PWC said in its Global Entertainment and Media Outlook: 2007-2011.

In the long wait for a winner, studios that chose one format could find they're leaving money on the table, Adams said.