Using the 70mai A810 Dashcam for Mapillary

Contributing and equipment
26

Yes, of course - GPSData000001.txt - Google Drive
In general, I tried the set of scripts proposed by Doriel and got the result, however, I have some comments on it and I deleted the sequence uploaded to Mapillary. Firstly, as I indicated in the previous post, the first_script.py script cannot handle the real GPSData000001.txt file from the DVR due to the presence of incomplete lines or lines with incorrect coordinates (as it turned out, there are some). In order for the script to execute, I had to manually edit the GPSData000001.txt file. Secondly, different approaches are used when forming the gpx file and extracting images from the video. In gpx, points are added by interpolation until their frequency is reached with an interval of 1 meter. And it works really well. I decided to increase the interval to 2.5 meters for myself and got a gpx file with 338 points on a 3-minute video sample. The images are extracted with a constant time interval of 0.1 seconds. Thus, 1800 images were obtained from the video, of which about 20 were rejected by Mapillary. The result was a very high frequency of images. In my opinion, here we need to strive for the number of images in the result to be equal to the number of points in the GPX file. I hope it will be clear what I wanted to say. Unfortunately, I do not speak English and use Google Translate.
Well, just in case, hereā€™s a sample video - NO20240716-183414-006050F.mp4 - Google Drive

27

I have a 70mai A500s dashcam, and it also stores the GPS data as a txt file.
Do you need more examples?
It has been added to mapillary_tools?

28

Thanks @andrcondon - it has not yet been added to mapillary_tools, I am hoping to get a volunteer to contribute the code to GitHub - mapillary/mapillary_tools: Command line tools for processing and uploading Mapillary imagery - I think the sample code provided in this thread is already in python so theoretically it should be straightforward.

In the meantime you either need to use the .exe or compile it yourself based on the code provided in this thread.

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29

As we have found out, the format of GPS text files for 70mai A810 and A800 DVRs is almost the same, which allows them to be processed by one script. It will be interesting to see how this file looks for the A500.

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30

Sorry for the late response
The format looks alike, but lacks the video file name:

https://drive.google.com/file/d/1Wu9ClXj6bzhtOm37_lEbio5a1UTOehTq/view?usp=sharing

$V02
1739607152,A,-34.913266,-56.175650,34700,138,-2,84,46,0,0,0,0
1739607154,A,-34.913289,-56.175651,34700,0,-3,85,48,0,0,0,0
1739607155,A,-34.913298,-56.175657,34700,0,-4,85,47,0,0,0,0
1739607157,A,-34.913289,-56.175645,34700,0,-4,86,47,0,0,0,0
1739607158,A,-34.913288,-56.175638,34700,0,-3,84,47,0,0,0,0
1739607160,A,-34.913280,-56.175630,34700,0,-2,84,47,0,0,0,0
1739607161,A,-34.913280,-56.175628,34700,0,-4,84,49,0,0,0,0
1739607163,A,-34.913281,-56.175628,34700,0,-3,84,48,0,0,0,0
1739607164,A,-34.913284,-56.175619,34700,27,-3,84,46,0,0,0,0
1739607166,A,-34.913283,-56.175608,34700,55,-3,85,45,0,0,0,0
1739607167,A,-34.913273,-56.175599,34700,55,-3,85,48,0,0,0,0
1739607169,A,-34.913251,-56.175534,7000,166,-4,85,48,0,0,0,0
1739607170,A,-34.913238,-56.175529,7000,0,-4,85,49,0,0,0,0

I think the $V02 tag starts a new video file

31

Thank you @matsumi - Iā€™ve also been chatting with GPS Babel about adding support for this format. Are you OK with them using your .txt file and granting permission to use and publish it. If so a portion of it will be publicly available.

32

Thank you @andrcondon - are you also OK with granting permission to use and publish your txt file? If so a portion of it will be publicly available.

33

Yes, I grant permission to publish my file

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35

Yes, itā€™s certainly worth asking! I would encourage folks to try (and in parallel I think it also makes sense to see what we can do with the current format). Unfortunately tools like exiftool and GPS Babel have demonstrated that historically manufacturers arenā€™t particularly consistent in how they treat this data.

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36

Hello, if it is still needed, I have uploaded a TXT file and examples of MP4 videos from the A810 dashcam to Google Drive and grant permission for their use.

37

I also received a sample video file and a TXT file from the new 70mai Dash Cam 4K Omni (X800), and it seems that the structure of the TXT file has not changed.

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38

Excellent, thank you!

39

I thought I was giving permission for use when I posted links to the data I provided.

40

Hi folks, we now have a good & safe way to support the 70mai dashcams on Windows/Mac/Linux thanks to work by the GPSBabel team. Here are the instructions:

  1. Install one of the continuous releases of GPSBabel (support is not yet available in the ā€œofficial releaseā€)

  2. Select ā€œ70mai Dash Camā€ as the format, and choose the input .txt file that your 70mai dashcam creates and set the output filename and press OK for GPSBabel to generate a converted .gpx file.

    1374Ɨ1126 143 KB

  3. Drag your video file into the Mapillary Desktop Uploader. You will get an error that there is no GPS data. Click the overflow menu, select ā€œAdd GPX fileā€ and choose the .gpx you created in step 2.

Now youā€™re ready to upload your 70mai video.

Cheers,

  • Boris
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