Try as we might, we couldn’t get Red Hot Chili Peppers bassist Flea on the phone this week to talk about “Low Down,” the film he and Peppers frontman Anthony Kiedis executive produced. It’s one of more than 130 films screening at this weekend’s New Hampshire Film Festival, and Flea is supposed to be there. We did reach Zak Piper, producer of the Roger Ebert documentary, “Life Itself,” which is screening Sunday. “Roger was kind of an everyman,” Piper told us Thursday. “He was a really sophisticated everyman who wrote about his viewing experience in a way that was different than how critics were writing before him.” The film, which debuted at the Sundance Film Festival in January, is based on Ebert’s 2011 memoir and includes interviews with such filmmakers as Martin Scorsese, Werner Herzog, and Cambridge’s Errol Morris. Piper will answer questions after Sunday’s screening.