Script that uses ffmpeg to create multiple JPG images from a video file.

split-video-to-photos

#!/usr/bin/env ruby

if ARGV.empty?
  raise 'Syntax is: split-video-to-photos video_file_spec'
end

def run_command(command)
  puts command
  IO.popen(command).each { |line| puts line }
end

def output_mask(filespec)
  extension = File.extname(filespec)
  filespec[0...(-(extension.length))] + '-%3d.jpg'
end

def build_command
  filespec = ARGV[0]
  images_per_second = '-r 4'
  highest_quality_output = '-qmin 1 -qscale:v 1'
  command = "ffmpeg -i #{filespec} #{images_per_second} #{highest_quality_output}  #{output_mask(filespec)}"
end

run_command(build_command())