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This article shows you how to extract the frame (picture) of a video
List
Once you have installed ffmpeg, you can execute the following command.
Extract the first 20 frames
ffmpeg -i input.mp4 -vframes 20 output_image_%03d.jpg
Extract the frame 30
ffmpeg -i input.mp4 -vf "select=eq(n\,30)" -vframes 1 output_image.jpg
Extract every n frames (samples)
ffmpeg -i movie.mpg movie%d.jpg