TV on the Radio

An application that displays images from the TV every 5 or 10 seconds on a connected second screen.

Partially implemented in this fork

• Just uses the tiny web server to load an image every 5 or 10 seconds, based on the time as fed to the server from Radiodan.

The images were created using ffmpeg from an mp4:

#!/usr/bin/env ruby
# pass the video source file(s) into the command line args
# resulting images are jpg, just change the appropriate ffmpeg option for png.
# the last line uses ImageMagick to stitch the images together into a strip.    
# the first image is thrown away, since it's a duplicate of the second image.
# http://stackoverflow.com/questions/3306888/ffmpeg-generate-n-evenly-spaced-png-screenshots

ARGV.each do|a|
  total_shots = 354
  size = '768x576'
  meta = %x(ffmpeg -i #{a} 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//)
  time_parts = meta.match /(\d\d):(\d\d):(\d\d)\.(\d\d)/
  duration_seconds = time_parts[1].to_i*60*60+time_parts[2].to_i*60+time_parts[3].to_i+time_parts[4].to_f/100
  puts "*** Duration seconds: " +  duration_seconds.to_s
  %x(ffmpeg -i #{a} -r #{total_shots/duration_seconds} -s #{size} -f image2 -vframes #{total_shots+1} img-%03d.jpg )
  files = (1..total_shots+1).map{|i| 'img-' + ("%03d" % i) + '.jpg'}
  files.delete_at 0
  # %x(convert -append #{files.join ' '} shot-strip.jpg)
end