I stumbled across this on Youtube just now and was surprised to see Peter Turgeon amongst the cast members (as Uncle Anders). De Duva circulated in museum and library showings when I was growing up in the 1970s. It is a short film in black and white done as a satire on Bergman, especially WILD STRAWBERRIES and DAY OF WRATH, with actors speaking fake Swedish (really quite clever if you listen closely) and subtitles:
http://www.youtube.com/watch?v=8X2QmLWWxq4The movie lasts about 14 minutes.
G.