Hey Phil (and contributors),
thanks for this cool tool! From the help output alone one can see the tons of hours that sunk into this.
And that helped me finally fix a very annoying gopro (hero7, maybe others) bug:
If time is reset in the gopro (e.g. battery low for longer period of time), there is no warning about it and following recordings have a timestamp from 2016.
I'm sure lots of people have suffered from this but I found just complaints, no solution. Until now.
Thankfully JPEGs also include the correct GPS time, so I could calculate the exact offset and fix lots of videos and pictures with a small python script (https://gist.github.com/joba-1/bdff43371dee7e23f536e7da5e373116) calling your exiftool.
Thanks again, didn't think this could be salvaged but you made it possible 8)
Great. Good to hear!
- Phil