Viacom

(VIA) - Get Report

is reportedly close to making a decision on the divestiture of its large stake in

Blockbuster

(BBI) - Get Report

.

The entertainment giant has yet to decide what form the divestiture will take but is in advanced talks about a sale to a group of private-equity investors, according to

The Wall Street Journal

.

That group includes Thomas H. Lee, Blackstone Group LP and Quadrangle Group LLC. The sale could fetch about $2.5 billion.

Viacom has been weighing the divestiture of its near-82% stake because inexpensive DVD sales have eroded Blockbuster's DVD and video rental income.