Marjane Satrapi discusses writing and co-directing the new film “Chicken with Plums,” based on her graphic novel of the same name. The story begins in Teheran in 1958, when renowned musician Nasser Ali Khan has lost the will to live since his violin has been destroyed. Finding no instrument worthy of replacing it, he decides to confine himself to bed and wait for death. Through the film a poignant secret of his life comes to light, a story of love that inspired his genius and his music. “Chicken with Plums” opens August 17 at Lincoln Plaza and Angelika Film Center.