How wonderful - I'd read about one of Von Sternberg's masterclasses years ago in Kevin Brownlow's (AMAZING) book on the silent era, The Parade's Gone By, but I never expected to be able to watch one!
For anyone with an interest in the history of Hollywood and filmmaking in the early days, I can't recommend that book highly enough; Brownlow doesn't just deal with the dates & places, he interviewed surviving cast & crew in the fifties and sixties, and got their first-hand stories of life at the time. It's a wonderfully engaging read.
Thanks to the Australian Cinematographers Society for posting this!