Hello, I am new to this Forum.
I want to decode an extracted gps information from a video
I run exiftool -ee -V3 -b -GPSDataList -GPS drive_record_1.MP4 > test.txt
and obtained this kind of response:
GPSDataList = .......-...Cf\.YS..n....................2........%L....d../.t..D.(..Z[snip]
| - Tag 'gps ' (248 bytes):
| 290fed7: 00 00 01 01 00 00 00 1e 00 17 fd f0 00 00 80 00 [................]
| 290fee7: 00 2d 1d 8c 00 00 80 00 00 43 66 5c 00 00 80 00 [.-.......Cf\....]
| 290fef7: 00 59 53 1c 00 00 80 00 00 6e f1 94 00 00 80 00 [.YS......n......]
| 290ff07: 00 83 f5 cc 00 00 80 00 00 99 f9 c0 00 00 80 00 [................]
| 290ff17: 00 af e4 d0 00 00 80 00 00 c4 fe b0 00 00 80 00 [................]
| [snip 168 bytes]
---- Extract Embedded ----
Type='gps ', Sample 1 of 30 (32768 bytes)
17fdf0: 00 00 80 00 66 72 65 65 47 50 53 20 6c 00 00 00 [....freeGPS l...]
17fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
17fe10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
17fe20: 59 57 4b 4a 47 50 53 00 00 00 00 00 01 00 00 00 [YWKJGPS.........]
17fe30: fc ff ff ff 41 00 00 00 07 00 00 00 12 00 00 00 [....A...........]
[snip 32688 bytes]
Type='gps ', Sample 2 of 30 (32768 bytes)
2d1d8c: 00 00 80 00 66 72 65 65 47 50 53 20 6c 00 00 00 [....freeGPS l...]
2d1d9c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
2d1dac: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [................]
2d1dbc: 59 57 4b 4a 47 50 53 00 ff ff ff ff ff ff ff ff [YWKJGPS.........]
2d1dcc: f9 ff ff ff 41 00 00 00 07 00 00 00 12 00 00 00 [....A...........]
[snip 32688 bytes]
...
...
I want to extract the gps information, specially, longitude, latitude and altitude.
Is there a command to try to decode this information?
Here is the .mp4 file: https://drive.google.com/file/d/1xRpZQ46BybiSRRsAuy9zYD2PIDR6cqti/view?usp=sharing
Thanks in advance.
If it helps, this is the camera model: ミツバ EDR-21Gα.
And I think the name of the file is important for decoding:
This was the original name: F_20190101000008_20210224161853_N.MP4
Also, here is the software use to view the gps position https://www.mskw.co.jp/motorcycle/edr/support/
Phil will probably take a look at the file when he get's a chance, but it may not be possible to decode the data. Running this command
exiftool -G1 -a -s -ee3 -gps* Y:\!temp\ccc\20211216081802_001314A.MP4
results in wildly inaccurate values
[QuickTime] GPSDateTime : 2021:12:16 08:18:02Z
[QuickTime] GPSLatitude : 18304 deg 10' 50.07" N
[QuickTime] GPSLongitude : 279 deg 41' 46.54" W
[QuickTime] GPSSpeed : 0.1482
[QuickTime] GPSTrack : 180
It may be related to this post (https://exiftool.org/forum/index.php?topic=11546.msg61911#msg61911) in which the numbers are obfuscated.
＠StarGeek thank you for kind reply and explanation. I hope Phil takes a look of it. I also suspect the numbers are obfuscated, do not any about decoding but because the software did not accept any file name, I believe the name of the file may some information for the decoding.
I really want to wait and see if Phil can give us more clues.
Thank you.
Quote from: StarGeek on May 23, 2022, 11:07:34 AM
Phil will probably take a look at the file when he get's a chance, but it may not be possible to decode the data. Running this command
exiftool -G1 -a -s -ee3 -gps* Y:\!temp\ccc\20211216081802_001314A.MP4
results in wildly inaccurate values
[QuickTime] GPSDateTime : 2021:12:16 08:18:02Z
[QuickTime] GPSLatitude : 18304 deg 10' 50.07" N
[QuickTime] GPSLongitude : 279 deg 41' 46.54" W
[QuickTime] GPSSpeed : 0.1482
[QuickTime] GPSTrack : 180
It may be related to this post (https://exiftool.org/forum/index.php?topic=11546.msg61911#msg61911) in which the numbers are obfuscated.
I tried running the command you suggested but gives an empty response. I tried in windows, wsl and linux. I believe in windows I am using the latest version(12.41) and in linux 12.40.
In Linux, make sure you put quotes around -gps*, as the asterisk is a special character. Something to do with file globbing, but I can never find a page which properly explains it in this context.
Otherwise, I don't know why it wouldn't work for you. Here's the full output (https://pastebin.com/gqQqDnHL) on PasteBin, 1500+ lines.
@StartGeek, thank you for the snippet !!
Still does not work on Linux or Windows but is nice step to see the resulting data, even if obfuscated.
I do not know if helps but, these are the actual coordinates:
"Date","Time","Latitude","Longitude","Altitude"
"2021-02-24","07:19:23",35.678787231445313,139.77952575683594, 0
"2021-02-24","07:19:24",35.678836822509766,139.779541015625, 0
"2021-02-24","07:19:25",35.678882598876953,139.779541015625, 0
"2021-02-24","07:19:26",35.678920745849609,139.77960205078125, 0
"2021-02-24","07:19:27",35.678951263427734,139.77960205078125, 0
"2021-02-24","07:19:28",35.678989410400391,139.77964782714844, 0
"2021-02-24","07:19:29",35.679023742675781,139.77967834472656, 0
"2021-02-24","07:19:30",35.679065704345703,139.77969360351563, 0
"2021-02-24","07:19:31",35.679111480712891,139.77972412109375, 0
"2021-02-24","07:19:32",35.679176330566406,139.77976989746094, 0
"2021-02-24","07:19:33",35.679244995117188,139.77980041503906, 0
"2021-02-24","07:19:34",35.679313659667969,139.77984619140625, 0
"2021-02-24","07:19:35",35.679397583007813,139.77992248535156, 0
"2021-02-24","07:19:36",35.679485321044922,139.77995300292969, 0
"2021-02-24","07:19:37",35.679561614990234,139.77999877929688, 0
"2021-02-24","07:19:38",35.679645538330078,139.78005981445313, 0
"2021-02-24","07:19:39",35.679721832275391,139.78010559082031, 0
"2021-02-24","07:19:40",35.6798095703125,139.78013610839844, 0
"2021-02-24","07:19:41",35.679893493652344,139.78018188476563, 0
"2021-02-24","07:19:42",35.679969787597656,139.78022766113281, 0
"2021-02-24","07:19:43",35.6800537109375,139.78028869628906, 0
"2021-02-24","07:19:44",35.680122375488281,139.78033447265625, 0
"2021-02-24","07:19:45",35.680187225341797,139.78036499023438, 0
"2021-02-24","07:19:46",35.680255889892578,139.78041076660156, 0
"2021-02-24","07:19:47",35.680320739746094,139.78044128417969, 0
"2021-02-24","07:19:48",35.680377960205078,139.78045654296875, 0
"2021-02-24","07:19:49",35.680427551269531,139.780517578125, 0
"2021-02-24","07:19:50",35.680477142333984,139.78053283691406, 0
"2021-02-24","07:19:51",35.680522918701172,139.78056335449219, 0
"2021-02-24","07:19:52",35.680568695068359,139.78059387207031, 0
Maybe it is an edited version of the file you uploaded? Or maybe you have a older version of exiftool somewhere on your drive that is called instead of the one you think is called. Try exiftool -ver to see the version and where exiftool on Windows to see possible locations. I think you would use which instead on Linux.
QuoteMaybe it is an edited version of the file you uploaded? Or maybe you have a older version of exiftool somewhere on your drive that is called instead of the one you think is called. Try exiftool -ver to see the version and where exiftool on Windows to see possible locations. I think you would use which instead on Linux.
@StarGeek, thanks again for your suggestions.
exiftool -ver returns 12.41 in Windows, 11.88 in WSL(Ubuntu 20) and 12.40 in Linux(Ubuntu 22). I believe the file is the same that I shared.
Thanks for your kind help. I do not know if you have any more clues.
I get the same thing as StarGeek when looking at this file.
Unfortunately the coordinates seem to be obfuscated as StarGeek mentioned, and as yet I don't know how to decode them. :(
- Phil
Phil, thank you for you kind reply. I really appreciate it. Please have a wonderful day! :D