Long before A.I., Walter Murch had a love affair with a machine. It was called the Moviola, and together they embarked on an analog romance to which his wife, Aggie, eventually resigned herself. Mr. Murch, who has lived in Bolinas for decades, used the machine to edit some of the most famous movies ever made, including “The Godfather,” “American Graffiti” and “Apocalypse Now.” Now he has made a documentary about how the Moviola revolutionized the art of film editing, long before the digital transformation of the 1990s. The Bolinas Film Festival will host a free screening of the film, “Her Name Was Moviola,” followed by a Q&A this Saturday, Feb. 22, at 6 p.m. at the Calvary Presbyterian Church. Mr. Murch has won three Academy Awards, including for best sound and best film editing. His love letter to the Moviola was released last year, which happened to be her 100th birthday. “There was no record on film of what you actually had to do, in excruciating detail, to edit a motion picture back in the day of analog editing, before digital editing came along,” Mr. Murch told the Light this week. “There are books about it, and there are little fragments you see in films, but there’s nothing that actually takes you through each step.” Filmmakers used the Moviola to edit nearly every major motion picture from the 1920s to the mid-’90s. The machine had a viewer that allowed editors to view their work without going back and forth to a projection room to screen it. “The Moviola is like a sewing machine on stilts,” Mr. Murch said. “It’s an ungainly, rackety old machine that fundamentally did not change since it’s invention. It allowed editors, for the first time, to pinpoint exactly the frame that they would want to cut on. Prior to that, they had to make a best guess.” In the documentary, Mr. Murch uses scenes from Mike Leigh’s 2014 drama “Mr. Turner,” reverse engineered from digital to 35mm prints, to demonstrate how the Moviola helped create a cohesive narrative from individual shots. Doors open at 5:30.