TIME WARNER INC. has named Warner Bros. current chief operating officer BARRY MEYER as the new chairman and chief executive of the film studio, and Castle Rock Entertainment Chairman ALAN HORN as its president and chief operating officer. The new team, which takes over October 4, replaces Warner Bros. co-chairmen Robert Daly and Terry Semel, who announced last month that they would step down from the studio they have run together for nearly twenty years. Meyer joined Warner in 1971 as a director of business affairs, and became executive vice president in 1984, taking charge of all the studio's television operations. He assumed the additional post of chief operating officer in 1994. Horn was the co-founder of Castle Rock Entertainment, which produced the hit TV comedy SEINFELD, as well as such films as WHEN HARRY MET SALLY and IN THE LINE OF FIRE. Castle Rock was acquired in 1993 by Turner Broadcasting prior to its merger with Warner Bros. parent company, Time Warner.