OpenCV container with FFmpeg based on Ubuntu:
It will take around 2 hours, it depends from the CPU.
docker build -t opencv_ffmpeg:latest https://raw.githubusercontent.com/simonyipeter/OpenCV4.3.0_FFmpeg/master/Dockerfile
docker run -itd -v $PWD/:/home/host_dir/ --name opencv_ffmpeg opencv_ffmpeg
echo $'import cv2\nprint(cv2.__version__)' > opencv_version.py
docker exec -it opencv_ffmpeg python3 /home/host_dir/opencv_version.py