LOS ANGELES — Paramount Pictures has failed to get two of the nation’s three largest theater chains on board with an effort to shorten the length of time it takes for new wide-release movies to become available to watch at home.

Timothy Warner, the chief executive of Cinemark, told analysts in an earnings call on Thursday that it would not take part in a Paramount experiment that involves rushing a pair of October releases to iTunes and other digital platforms after the number of traditional screens the films appear on drops to fewer than 300.

The movies are “Paranormal Activity: The Ghost Dimension” and “Scout’s Guide to the Zombie Apocalypse.”

Despite “serious talks with Paramount,” Mr. Warner said, “we don’t feel it was in either our best interest or our shareholders’ best interest.” Cinemark has 4,491 movie screens in the United States, making it the nation’s third-largest exhibitor.