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Hiker
Posts: 16

Timestamp bugs in photo timelapse

[ New ]

Hi!

I use some Hero 9 in 0.5s photo timelapse mode. I noticed 2 problems with the exif timestamps.

 

1) Wrong timestamp
example:

G0019509.JPG 19:12:06.794
G0019510.JPG 19:12:07.297
G0019511.JPG 19:12:07.800
...
...
G0026455.JPG 20:09:59.204
G0026456.JPG 20:09:59.704
G0026457.JPG 20:09:00.204
G0026458.JPG 20:10:00.704
G0026459.JPG 20:10:01.204

Notice the wrong minute for G0026457.JPG

 

2) Timestamp drift
I correlate the images with a centimetric RTK GNSS trace to get a very accurate geolocalisation. When I correlate a long sequence, at the end of it, the timestamp is early in time. I compensate it with a script which look like this:

new_timestamp = img_timestamp - ((img_timestamp - start_time) * rtc_fix/100)


With a rtc_fix value sets to 0.007 I get a good result. That's a 250ms offset per hour. That's a big drift.


I looks like the 2 issues have the same source : I guess the timestamp written in the images come from an internal counter, and this counter isn't synced with the internal clock.

 

The firmware used is v1.50.72 (GoPro Labs)

Hiker
Posts: 16

Re: Timestamp bugs in photo timelapse

[ New ]

Has this bug been reported to the development team?

GoPro
Posts: 19,976

Re: Timestamp bugs in photo timelapse

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Hello, @sprystorm3611. Yes, we have reported this last month. Apologies for not being able to acknowledge your original post. We do not have an update about it at this time though. We post about it once we hear back from the team. Thanks!

Hiker
Posts: 16

Re: Timestamp bugs in photo timelapse

[ New ]

Ok, thank you!

 

I hope you will report the new one too: https://community.gopro.com/t5/Cameras/subsecond-timestamp-bug/m-p/1057505

GoPro
Posts: 27,286

Re: Timestamp bugs in photo timelapse

[ New ]

Hi @sprystorm3611

 

We'll have this included.

Thanks for letting us know.

 

Regards,

Ej

Hiker
Posts: 16

Re: Timestamp bugs in photo timelapse

[ New ]

The bug with the wrong minute is still here with firmware 1.60.70 Smiley Sad