One of the most successful films of all time, The Sound of Music, was released 50 years ago. The film was based on the true story of the von Trapp family. But was their life really as it was portrayed in the movie? Maria von Trapp's youngest child, Johannes, talks to WItness.
(Photograph: The Trapp Family Singers, whose story inspired the film The Sound of Music, in Salzburg in 1937. Credit: BBC Photo Archives)