Simple MJPEG timelapse lua script for Canon cameras runnung Magic Lantern firmware

ml_timelapse_video.lua

-- timelapse script for Magic Lantern firmware

require('dryos')
require('io')

function image_path(number, extenstion)
  return dryos.dcim_dir.path .. dryos.prefix .. (number+dryos.shooting_card.file_number) .. extenstion
end

function main()
    local frames_amount = 60
	local timelapse_interval = 1*1000
	
    menu.close()
	console.show()
	local initial_file_num = dryos.shooting_card.file_number
	console.write("File num: " )
    console.write(initial_file_num)
	console.write("\n")
	
	local new_timelapse_file = image_path(1, ".MJP")
	console.write("file: " .. new_timelapse_file .. "\n")
	
	local videofile, err = io.open(new_timelapse_file, "wb")
	console.write(videofile)
	console.write("\n")
	if err then console.write("error opening file: " .. err .. "\n") end
	
	videofile:setvbuf("no")
	for i = 1, frames_amount do
	  camera.shoot()
	  beep() -- keeps you awake :D
	  msleep(500) -- wait until frame is written to card, camera.wait() was unavailable in my env
	  -- below part is pretty slow, takes several seconds to complete
	  local current_file = image_path(0, ".JPG")
	  local latest_jpeg, err2 = io.open(current_file, "rb")
	  if (err2) then console.write("error jpeg file: " .. err2 .. "\n") end
	  local jpeg_data = latest_jpeg:read("*all")  -- read all jpeg
	  videofile:write(jpeg_data) -- write current frame
	  jpeg_data = "" -- dereference jpeg data so gc can collect
	  latest_jpeg:close()
	  beep(2)
	  msleep(timelapse_interval-500) -- wait until next frame time comes
	end
	videofile:close()
    console.show()
    print "Timelapse done"
    key.wait()
    console.hide()
end

keymenu = menu.new
{
    name   = "RAW MJPEG timelapse",
    help   = "WOW! Even good old 550D can do this!",
    select = function(this) task.create(main) end,
}

Hi, I am using your script in a 550D, but after finishing the timelapse, when try to open the MPJ video... I can´t open it. I have just achived once, with a nice video, but I have failed in the other cases. I am missing any configuration required? and do you think is possible to create another video format?
Nice script, thanks