Berthold Stoeger 02ad18d4d8 Metadata: extract duration fom QuickTime/MP4-style containers
We want the duration of videos for two reasons:
 - To display the duration of the video in the profile plot.
 - To be able to determine which dive a video is closer to if the
   start is not during a dive.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2018-07-14 08:32:30 +02:00
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