webrick, convert jpg to video then return response

gistfile1.txt

require 'RMagick'
myFiles=Dir["*.jpg"].sort
p myFiles

i = Magick::ImageList.new(*myFiles)
p i.length
i.delay = 50
i.write "animated7.mpg"

# Now webrick code
# imgFileList is an array
tempRes = Magick::ImageList.new(*imgFileList)
tempRes.delay = 50
res.body = tempRes