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<div class="moz-cite-prefix">Le 06/09/2020 à 16:50, Robert Helling a
écrit :<br>
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<blockquote type="cite"
cite="mid:06FF9BDE-8043-458B-9445-5A4C42AEEC74@atdotde.de">
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Enric,<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 5. Sep 2020, at 19:20, Dirk Hohndel via
subsurface <<a
href="mailto:subsurface@subsurface-divelog.org" class=""
moz-do-not-send="true">subsurface@subsurface-divelog.org</a>>
wrote:</div>
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<div class="">Robert,<br class="">
<br class="">
I assume you might be the better person to respond to this
one...<br class="">
<br class="">
/D<br class="">
<br class="">
<div class="gmail_quote">On September 5, 2020 1:57:37 AM
PDT, Eric Tanguy <<a
href="mailto:erictanguy2@orange.fr" class=""
moz-do-not-send="true">erictanguy2@orange.fr</a>>
wrote:
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<p class="">Hi, i have some problems importing png and
mp4 medias.</p>
<p class="">With png, i think there is a location time
problem. When i try to import a png media in
subsurface it finds that the dive time is GMT
whereas the dive time imported is Paris Time so
there is 2 hours of difference. So why the importing
dive time is considered as GMT ? Maybe it's why i
can't achieve anymore the GPS synchonization with
subsurface-mobile</p>
<p class="">With mp4 files, i have another problem. I
use attribute changer to modifiy created time,
modified time and accessed time but subsurface seems
to read date and time in other place i can't achieve
to find and change ...</p>
<p class="">Thanks</p>
<p class="">Best regards</p>
<p class="">Eric<br class="">
</p>
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<div>First of all: Time zones are difficult. In Subsurface we
decided that all times are local times and we explicitly don’t
keep a time zone (as that would create problems like: On a
vacation, your are in some time zone and start a dive at 9 a.m.,
say. Then you return home and change to your local time zone and
it would look like your dive started in the middle of the
night). But you are correct, this can create problems when
importing date/time from other sources that come with time zone
information like importing media. When thus forced to say which
time zone the internal Subsurface time corresponds to, we use
UTC lacking anything better. </div>
<div><br class="">
</div>
<div>To avoid the problems you describe, the media import dialog
through which you add media files to dives offers you the
possibility to apply a time shift. Simply set that to one or two
hours (depending if you are in daylight saving time or not)
should solve this for you. If you don’t want to do the mental
math, there is even the possibility to take a picture of your
dive computer showing what it thinks the time is and Subsurface
will do the math for you. This also removes problems stemming
from your dive computer and your camera not having exactly
synched clocks. All this is described in section 4.5 of the
Subsurface user manual.</div>
<div><br class="">
</div>
<div>As you found out, we don’t use the time stamp of the image
files but rather the time that is in the EXIF data of the media
file. If you really want to change that you should use an
exif-editor.</div>
<div><br class="">
</div>
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<div>Hope that helps.</div>
<div><br class="">
</div>
<div>Robert</div>
</div>
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</blockquote>
<p>Thanks Robert for your answer. I use the time shift for png
photos files and it works fine. I use an exif-editor and it works
fine for photos but not for mp4 videos. All the exif-editor i
found does not not support video as exif is only defined for
photos.</p>
<p>So i can't achieve to modifiy the date and time value read by
sub-surface. Using "Attribute changer" (<a class="moz-txt-link-freetext" href="https://www.petges.lu/">https://www.petges.lu/</a>)
does not work. I can't figure where is hidden the value read by
subsurface.</p>
<p>Best regards</p>
<p>Eric<br>
</p>
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