Inverse geotagging from NextBase 622GW dashcam video

Started by ekantons, April 19, 2021, 04:12:18 PM

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ekantons

I am trying to extract the GPS data from a Nextbase 622GW dashcam MP4 video.  I have not had success following the example commands/switches for the Nextbase 512 camera.
The output for the first 1050 byte block of GPS data from:
exiftool -ee -v4 videofile.mp4
is below.
The date/time stamp can be seen (20200101000005) starting at the 6th byte of the block, but the remainder of the data appears to be binary.
Can you help decode it and let me know the exiftool command switches?

---- Extract Embedded ----
Track3 Type='text' Format='text', Sample 1 of 600 (1050 bytes)
   5b848: 04 18 00 00 00 00 32 30 32 30 30 31 30 31 30 30 [......2020010100]
   5b858: 30 30 30 35 00 00 2a 00 40 00 54 ff dc fe f5 06 [0005..*.@.T.....]
   5b868: 19 ff b5 fb 0a 00 8c ff a4 fe f1 06 1f ff b5 fb [................]
   5b878: 12 00 1a ff 96 fe 03 07 2b ff b0 fb 20 00 de fe [........+... ...]
   5b888: d8 fe e8 06 2a ff ad fb 2e 00 e8 fe e6 fe ea 06 [....*...........]
   5b898: 28 ff ad fb 2a 00 60 ff 0a ff ee 06 1e ff ad fb [(...*.`.........]
   5b8a8: 16 00 52 ff 10 ff f1 06 11 ff af fb 16 00 56 ff [..R...........V.]
   5b8b8: 14 ff f7 06 15 ff c9 fb 04 00 16 ff ea fe ee 06 [................]
   5b8c8: 1e ff ba fb 1e 00 44 ff 00 ff fb 06 21 ff bd fb [......D.....!...]
   5b8d8: 32 00 0e ff 2e ff f2 06 08 ff bb fb 16 00 28 ff [2.............(.]
   5b8e8: 1c ff e8 06 1e ff bb fb 36 00 16 ff 40 ff ed 06 [........6...@...]
   5b8f8: 1b ff c9 fb 3a 00 12 ff 3e ff fa 06 20 ff bb fb [....:...>... ...]
   5b908: 0e 00 40 ff 1c ff f1 06 1b ff c2 fb 28 00 32 ff [..@.........(.2.]
   5b918: 4e ff 04 07 22 ff bc fb 14 00 42 ff 32 ff e8 06 [N...".....B.2...]
   5b928: 10 ff c8 fb dc ff 36 ff ee fe f6 06 1c ff ca fb [......6.........]
   5b938: f8 ff d2 fe 1c ff fe 06 24 ff be fb 0e 00 b0 fe [........$.......]
   5b948: 52 ff eb 06 17 ff cb fb 06 00 f2 fe 38 ff 0d 07 [R...........8...]
   5b958: 1d ff cf fb fe ff 36 ff 2a ff e7 06 1f ff c9 fb [......6.*.......]
   5b968: 04 00 1c ff 0a ff e5 06 25 ff be fb 0a 00 b8 fe [........%.......]
   5b978: 1c ff f2 06 08 ff b3 fb 0a 00 74 fe 0a ff ef 06 [..........t.....]
   5b988: 1b ff bd fb 12 00 80 fe 22 ff 03 07 0d ff ae fb [........".......]
   5b998: 32 00 c4 fe 3c ff ee 06 0c ff b4 fb 1e 00 20 ff [2...<......... .]
   5b9a8: 2a ff e4 06 14 ff c5 fb 30 00 ea fe 50 ff 01 07 [*.......0...P...]
   5b9b8: 17 ff cb fb 12 00 b8 fe 36 ff e9 06 11 ff bf fb [........6.......]
   5b9c8: 32 00 8a fe 74 ff fb 06 07 ff a3 fb 48 00 9c fe [2...t.......H...]
   5b9d8: a6 ff e2 06 1a ff b6 fb 28 00 dc fe 9e ff e5 06 [........(.......]
   5b9e8: fb fe b7 fb 46 00 fa fe b0 ff f3 06 1d ff ba fb [....F...........]
   5b9f8: 16 00 2a ff 70 ff fe 06 04 ff ba fb 1c 00 ec fe [..*.p...........]
   5ba08: 4c ff e7 06 13 ff bc fb 18 00 d4 fe 3e ff e9 06 [L...........>...]
   5ba18: 05 ff b6 fb 0c 00 be fe 36 ff e5 06 01 ff b7 fb [........6.......]
   5ba28: 02 00 d0 fe 1c ff ea 06 04 ff ab fb e6 ff f2 fe [................]
   5ba38: 08 ff d5 06 0d ff b3 fb f6 ff f6 fe fa fe f5 06 [................]
   5ba48: ef fe b2 fb 20 00 ea fe 18 ff f2 06 f2 fe b9 fb [.... ...........]
   5ba58: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5ba68: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5ba78: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5ba88: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5ba98: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5baa8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bab8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bac8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bad8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bae8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5baf8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb08: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb18: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb28: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb38: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb48: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb58: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb68: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb78: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb88: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bb98: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bba8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bbb8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bbc8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bbd8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
   5bbe8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]

Phil Harvey

ExifTool should extract the GPS with the -ee option if it can decode it.  However, the data you posted is 6-axis accelerometer data, not GPS.

If you believe the file contains GPS data, you can send it to me and I'll see about adding support for decoding it.  My email is philharvey66 at gmail.com

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

havkacik

Hi Phil.

It seems that I am not getting whole a lot from GPS or Acceleration data either from my Nextbase 622GW dashcam MP4 video. I am using exiftool -ee video.mpt option and got things like:

GPS Altitude                    : 189.6 m
GPS Dilution Of Precision      : 0.96
GPS Date/Time                  : 2024:02:12 10:58:59.500Z
GPS Latitude                    : 40 deg 5' 35.58" N
GPS Longitude                  : 10 deg 26' 15.40" E
GPS Satellites                  : 13
GPS Speed                      : 25.8465
GPS Track                      : 119.49
Image Size                      : 3840x2160
Megapixels                      : 8.3
Avg Bitrate                    : 44.2 Mbps
Rotation                        : 0
GPS Position                    : 40 deg 5' 35" N, 10 deg 26' 15.63" E

I know there is more contained withing the file, like SPEED or ACCELOROMETER data, e.g.:
  • Actual Speed
  • Max Speed
  • Avg speed
  • Distance passed
  • Acc data: X
  • Acc data: Y
  • Acc data: Z


Is it possible somehow to detect it with ExifTool? Example of a file is attached under this location:

https://mega.nz/folder/cItzkAZB#ua-uc1jiB8p02XtDWcVBzA

Phil Harvey

Yes, there is information in this file that hasn't yet been decoded.

Do you have any utility to decode this?  If so, could you tell me the values for the first few samples so I know what to look for?

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).