GPS Information in mp4 is silently not updated

[HoHoprals]

Hi all!

I am currently on a quest to geotag all my phone video correctly. Most Smarthpones use the `Quicktime:GPSCoordinates` tag for that.
For example:

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$ exiftool -s -G0:2 -"Location:All"  myvideo.mp4
[QuickTime:Location] GPSCoordinates             : 53 deg 33' 54.5" N, 10 deg 00' 15.9" E
[Composite:Location] GPSLatitude                : 53 deg 33' 54.5" N
[Composite:Location] GPSLongitude               : 10 deg 00' 15.9" E
[Composite:Location] GPSPosition                : 53 deg 33' 54.5" N, 10 deg 00' 15.9" E


When I try to change the GPS info of this mp4 file in anyway, it doesn't work:

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$ exiftool -QuickTime:GPSCoordinates="5.0000 N, 5.0000 E"  video_exiftool.mp4
Warning: Sorry, QuickTime:GPSCoordinates doesn't exist or isn't writable
Nothing to do.

$  exiftool -s -G -GPSLongitude="5.0000 N"  video_exiftool.mp4
    1 image files updated

Aha, the lest command should have changes something, right?

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$ exiftool -s -G0:2 -"Location:All"  myvideo.mp4
[QuickTime:Location] GPSCoordinates             : 53 deg 33' 54.5" N, 10 deg 00' 15.9" E
[Composite:Location] GPSLatitude                : 53 deg 33' 54.5" N
[Composite:Location] GPSLongitude               : 10 deg 00' 15.9" E
[Composite:Location] GPSPosition                : 53 deg 33' 54.5" N, 10 deg 00' 15.9" E


Nope, nothing changes. Still the same coordinates as before. I don't understand why I am getting "1 image files updated" as output from the command. On top of that, I haven't found any way to set these GPS to anything else. Even deleting them with exiftool -Location= has no effect.

What am I doing wrong here?

[Alan Clifford]

My first thought is to put an -a in there

exiftool -a -G -s -gpslongitude myvideo.mp4

[StarGeek]

Use the command in faq 3 to see all tags and their location.

When you write  to GPSLongitude, you are writing  to XMP:GPSLongitude, but you don't see it because you aren't using -a.

Also, what version of exiftool are you using? Writing  GPSCoordinates should work.

Edit: Now home and not on mobile
Example output, I set GPSLongitude to 10 to show the difference.

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C:\>exiftool -P -overwrite_original -QuickTime:GPSCoordinates="5.0000 N, 5.0000 E" -GPSLongitude="10.0000 N" Y:\!temp\aa\Test.mp4
    1 image files updated

C:\>exiftool -G1 -a -s -ExifToolVersion -gps* Y:\!temp\aa\Test.mp4
[ExifTool]      ExifToolVersion                 : 12.39
[ItemList]      GPSCoordinates                  : 5 deg 0' 0.00" N, 5 deg 0' 0.00" E
[XMP-exif]      GPSLongitude                    : 10 deg 0' 0.00" E
[Composite]     GPSLatitude                     : 5 deg 0' 0.00" N
[Composite]     GPSLongitude                    : 5 deg 0' 0.00" E
[Composite]     GPSLongitudeRef                 : East
[Composite]     GPSPosition                     : 5 deg 0' 0.00" N, 5 deg 0' 0.00" E