 Rounseville appeared several times on television, as well as in two films.He is perhaps best known to opera buffs for starring in the role of Hoffmann in Michael Powell & Emeric Pressburger's film of Jacques Offenbach's "The Tales of Hoffmann" (1951), the first color film of an opera to use genuinely cinematic techniques (as opposed to filming a performance on stage).That same year, he was also the first Tom Rakewell, in the world premiere of Igor Stravinsky's opera "The Rake's Progress", onstage at La Fenice.