サンプルボイスとかのmp3 urlから声紋画像を得る

spectgram.rb

# Usage:
#   ruby spectrogram.rb <FILE URL>
# Example:
#   ruby spectrogram.rb http://www.imenterprise.jp/voice/voice/v86.mp3
unless ARGV[0].nil?
  filename = File.basename(ARGV[0]).sub(/\..*/, '')
  start    = ARGV[1] || 0
  duration = ARGV[2] || 1.5
  system("wget #{ARGV[0]} -O #{filename}.mp3")
  system("ffmpeg -y -i #{filename}.mp3 -vn -ac 2 -ar 44100 -acodec pcm_s16le -f wav #{filename}.wav")
  system("sox #{filename}.wav -n trim #{start} #{duration} rate 40k spectrogram -z 60 -o #{filename}.png")
  system("rm #{filename}.mp3 #{filename}.wav")
else
  puts "set mp3 URL"
end