piofo

A Python library for extracting GPS data / images from Viofo dashcam videos.

Requirements

• a GPU
• ffmpeg
• pip

Install Dependencies

sudo apt-get install ffmpeg

pip install -r requirements.txt

Install the CUDA toolkit:

https://developer.nvidia.com/cuda-downloads

This may require you to change your nvidia driver versions. CUDA is needed for running the OCR model on the imagery.

Setting up PostGIS with OSM data

Clone the wcedmisten/osm2pgsql-docker repo, and follow the steps from the README.

Running the pipeline

The entire pipeline does the following:

• extract the GPS track from a dashcam clip
• extract corresponding images for each point
• run OCR on each image
• if a "speed limit" sign is found in the image, check OSM to see if the road has "maxspeed" set
• if a missing speed limit is found, output a link to the image, and a link to the OSM feature

python src/pipeline.py /path/to/input.MP4

Testing

python3 -m unittest test/test.py

Original Sources:

https://sergei.nz/extracting-gps-data-from-viofo-a119-and-other-novatek-powered-cameras/

https://sergei.nz/files/nvtk_mp42gpx.py