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[Janwillem van Dijk <jwe.van.dijk@xxxxxxxxx>]

It seems that py3exiv2 does not handle timestamps in movies correctly; 
they are 66 years off. That is; on my system: Ubuntu 15.10 on Dell 
XPS13, Python 3.4.3
and my camera's: Nikon P340, P7800 and D5100 and Samsung MV800. These 
all return a date for movies that is in Macintosh format with epoch 
1904/1/1 whereas Python uses the Unix 1970/1/1 epoch. (The jpeg and raw 
images return an ISO date string.)
Doing: 
datetime.fromtimestamp(metadata['Xmp.video.MediaCreateDate']).value on a 
*.mov or *.mp4 taken today gives the date in 2081. Correcting with 
(datetime(1970, 1, 1) - datetime(1904, 1, 1)).total_seconds() gives the 
correct date and time of the movie.
My misunderstanding of pyexiv2 or a bug?