nasa_soho_view.rb

#!/bin/env ruby
# http://sohowww.nascom.nasa.gov/data/realtime/mpeg/

SOHO_URL = "http://sohowww.nascom.nasa.gov/data/LATEST/%s"
MPLAYER_CMD = 'mplayer -ao null -really-quiet -geometry %ix%i+%i+%i %s -loop %i -speed %s  &'
SOHO_ETI = {
  'ETI_171' => { filename: 'current_eit_171small.mpg' },
  #'ETI_195' => { filename: 'current_eit_195small.mpg' },
  'ETI_284' => { filename: 'current_eit_284small.mpg' },
  'ETI_304' => { filename: 'current_eit_304small.mpg' },
  #current_mdi_igrsmall.mpg
  #current_mdi_magsmall.mpg
  #current_c2small.mpg
  #current_c3small.mpg
}

def soho_mplayer(pos_x=0, pos_y=0, repeat=2, speed=0.5)
  base_x = pos_x
  cols, img_size = 2, 256
  #cols, img_size = 3, 200

  SOHO_ETI.each do |k,v|
    file = k.to_s + '.mpg'
    cmd = MPLAYER_CMD % [ img_size, img_size, pos_x, pos_y, file, repeat, speed.to_s ]

    unless File.exists? file
      url = SOHO_URL % [v[:filename]]
      system 'wget -O %s "%s"' % [ file, url ]
    end

    system cmd ; sleep 0.5

    pos_x += img_size
    if pos_x >= base_x + (img_size*cols)
      pos_x = base_x
      pos_y += img_size
    end
  end
end

if $0 == __FILE__
   puts "start playing recent nasa-soho videos"
   #soho_mplayer 800, 0, 0, 1.0
   soho_mplayer 0, 0, 2, 0.5
end