Moby discusses his feature documentary directorial debut, "Punk Rock Vegan Movie," which will be free online on February 1, and also playing at the Roxie Theater on February 4 as part of SF IndieFest. He also chats about his contribution to film soundtracks, the history of punk rock and how it has shaped his politics, when he became a vegan, and the honor of being featured in "Stranger Things" twice.