Watch Full Movie Online. The legendary soprano Elisabeth Schwarzkopf stars in this acclaimed film of Richard Strauss' delightful opera, Der Rosenkavalier. This Salzburg Festival production of Strauss' great work toured the world, and this filmed version was hailed by The New York Times as "Superb." Schwarzkopf performs her signature role as Princess von Werdenberg, an aging beauty involved with a younger man, Octavian. But when Octavian agrees to assist Baron Ochs by delivering the Baron's proposal of marriage to the beautiful young Sophie, the messenger and bride-to-be fall in love with each other!