How many movies have Daniel Barenboim and Waltraud Meier acted in together?

They have worked on 6 movies together! Their first movie together was The Ring Cycle: Gotterdammerung (1991) while their highest rated movie together was Tristan und Isolde (1995). They have not worked together since Wagner: Götterdämmerung (2014). They are most known for their music films together.