CODEWITHSUNDEEP
timestampmetadatajpegexiftoolsamsung
flesh997tt
flesh997tt

Reputation: 31

How to edit the Samsung Trailer Tag "Timestamp"

I have an image of which i'd like to modify the timestamp. The problem being that it is a samsung trailer tag and can't be modified with exiftool. Does anyone know of another tool that could do this? Thank you for reading.

Upvotes: 3

Views: 1364

Answers (3)

strandyMaze
strandyMaze

Reputation: 81

You can modify the hex data manually to adapt the samsung trail tag timestamp. This can be achieved with xxd:

  1. find the offset of the timestamp with exiftool. Search for Image_UTC_Data in the output of the following command:
exiftool -time:all -v3 image.jpg
  1. dump the image in hex format with xxd:
xxd image.jpg > image.txt
  1. step to the bytes which represent the timestamp shown in the output of step 1
  2. modify the bytes to represent the desired timestamp (Unix timestamps in ms). E.g. for January 6, 2024 7:04:50 PM (=1704567890000ms) use the following bytes:
31 37 30 34 35 36 37 38 39 30 30 30 30
  1. convert the modified hex data back to jpg file with xxd:
xxd -r image.txt > image_modified.jpg

Upvotes: 2

StarGeek
StarGeek

Reputation: 5791

To expand on the option suggested by @Ryan_Kinakr, editing the Samsung:TimeStamp tag should not be difficult to do in a hex editor. Make sure to use it on a test file, as I have not actually tested this to verify it works.

If you look at the file using exiftool's -v3 (-verbose3) option, you will see output similar to this for the Samsung trailer.

  SamsungTrailer_0x0a01Name = Image_UTC_Data
  - Tag '0x0a01-name' (14 bytes):
    3c8a6b: 49 6d 61 67 65 5f 55 54 43 5f 44 61 74 61       [Image_UTC_Data]
  TimeStamp = 1704333346492
  - Tag '0x0a01' (13 bytes):
    3c8a79: 31 37 30 34 33 33 33 33 34 36 34 39 32          [1704333346492]
  SamsungTrailer_0x0aa1Name = MCC_Data
  - Tag '0x0aa1-name' (8 bytes):
    3c8a8e: 4d 43 43 5f 44 61 74 61                         [MCC_Data]
  MCCData = 310
  - Tag '0x0aa1' (3 bytes):
    3c8a96: 33 31 30                                        [310]
  SamsungTrailer_0x0c61Name = Camera_Capture_Mode_Info
  - Tag '0x0c61-name' (24 bytes):
    3c8aa1: 43 61 6d 65 72 61 5f 43 61 70 74 75 72 65 5f 4d [Camera_Capture_M]
    3c8ab1: 6f 64 65 5f 49 6e 66 6f                         [ode_Info]
  SamsungTrailer_0x0c61 = 1
  - Tag '0x0c61' (1 bytes):
    3c8ab9: 31

The part to edit would be the [Image_UTC_Data] section. The thirteen bytes that make up the TimeStamp tag is simply the Unix time stamp for the set time. To edit it, you would need to figure out the Unix time stamp for the date/time you want to change it to, and overwrite that section with the new time stamp.

Note that when exiftool reads this tag, it converts it to the local time zone, so you will not be able to change the time zone that exiftool outputs. That value will always depend upon the locale set by the computer you are using.

Upvotes: 1

Ryan_Kinakr
Ryan_Kinakr

Reputation: 11

Exiftool cannot change the Samsung Trailer Tag however if you need to change it you need to open the image(file) in a hex editor and find what values need to be changed.

Upvotes: 1

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