[digikam] [Bug 457421] Digikam treats .MOV files differently from .JPG files by modifying timestamp in metadata to match local time, when video was taken in a different time zone according to GPS data

[Alec McLane]

https://bugs.kde.org/show_bug.cgi?id=457421

--- Comment #2 from Alec McLane <amclane at snet.net> ---
 Dear Maik,
Thank you for the quick reply. I am sending links to a JPEG and MOV that were
taken about 3 minutes apart in the same location, in a time zone 5 hours later
than my current one. In Digikam the JPEG has the time 2:08 PM, which was
correct in that time zone, while the MOV has the time 9:05 AM, which was the
time in my current location. 
My assumption would be that GPS data shouldn't be used to modify times, since
the time considered as the proper time when viewing images and videos should be
the time of day they was taken locally, regardless of the time zone. While I
don't understand fully how different devices register time stamps on files, it
seems that in this case the JPEG and MOV files have the correct timestamp in
the file properties, as they appear on disk, so I wouldn't see any need to
adjust this.
Anyway, thanks for looking into it. Here are the links:
 http://gofile.me/6Z828/3Xh4j2VeLhttp://gofile.me/6Z828/bdNENHL8i
Alec McLane
    On Tuesday, August 2, 2022 at 04:24:47 PM EDT, Maik Qualmann
<bugzilla_noreply at kde.org> wrote:  

 https://bugs.kde.org/show_bug.cgi?id=457421

Maik Qualmann <metzpinguin at gmail.com> changed:

          What    |Removed                    |Added
----------------------------------------------------------------------------
        Resolution|---                        |WAITINGFORINFO
                CC|                            |metzpinguin at gmail.com
            Status|REPORTED                    |NEEDSINFO

--- Comment #1 from Maik Qualmann <metzpinguin at gmail.com> ---
This is a long discussed problem. Depending on the camera model (iPhone,
camera, Android), we evaluate the time zone stored in the video metadata in
order to come very close to the actual result. Unfortunately, some set the time
zone correctly, others not. he current result is based on a long series of
tests by users who have provided us with video samples. We need an image and
video sample to analyze the problem.

Maik

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