“The Capote Tapes” is similar to the recent documentary “Billie,” in that it makes use of extensive audio recordings with people who knew the film’s subject — in this case the tapes that George Plimpton recorded for his oral biography of Truman Capote, which was published in 1997.
“Billie” used tapes that the writer Linda Kuehl made for a biography she planned to write of Billie Holiday, and the Kuehl tapes have been the basis of several books about Holiday, but this Holiday material was always quoted selectively and subjectively; the Plimpton interviews on Capote, by contrast, make up the entirety of his book, so it would seem to make less sense to do a movie based on these particular tapes.