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Old 12-07-2016, 03:03 PM   #3 (permalink)
HarryS
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Using external cams requires you to transfer footage to your smartphone first. Once this is done, overlaying GoPro vids works like overlaying videos recorded with the internal cams. The details are described here:

http://www.gps-laptimer.com/LapTimer...%20Chapter.pdf

- Harry
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