This is the original movie about the Trapp Family - the film adaptation of Maria von Trapp's autobiography. It was filmed and produced in Austria, in 1956, and it's in German (with a tinge of Austrian dialect), but with English subtitles (which you can switch on and off on the video). So this was almost a decade before the film with Julie Andrews came out. It is also much more authentic and a bit less cheesy (don't get me wrong, I love "The Sound of Music", but it views Austria through a very American lense

It's the full movie. There is actually a part two with the same actors which focuses on their time in America. If I find a free version, I'll post it here too.