FYI (Google is your friend)
https://www.bugcodemaster.com/article/extract-images-frame-frame-video-file-using-ffmpeg
http://blog.roberthallam.org/2010/06/extract-a-single-image-from-a-video-using-ffmpeg/
https://video.stackexchange.com/questions/16442/quickly-extract-video-frames-with-ffmpeg
https://stackoverflow.com/questions/10957412/fastest-way-to-extract-frames-using-ffmpeg
