I’m testing the Yi 4K since a few months, and I noticed a big problem with the exif’s timestamp:
Sometime, the datetimeoriginal tag is wrong. It seem’s this timestamp is computed at the writting time, not the capture time.
Here is an example with a 1s photo timelapse:
Then, the gpx correlation is complely wrong. I had to manualy move a lot of images before sending them on the Mapillary servers.