-- Script will pause at the beginning of each new subtitle for the amount of time that
-- the subtitle would normally appear on the screen, multiplied by FACTOR.
-- So if a sub was going to appear for 4 seconds and you have a FACTOR of 0.5 then
-- then there will be a 2 second pause when that subtitle appears.
local FACTOR = 0.5

local pause_disease = false

function pause(a, b)
  if not pause_disease then
    return
  end

  if b ~= "" then
    mp.set_property_native("pause", true)
    local pause_length = FACTOR * (mp.get_property_number('sub-end') - mp.get_property_number('sub-start'))
    mp.add_timeout(pause_length, function()  mp.set_property_native("pause", false) end)
  end
end

function toggle_pause_disease()
  pause_disease = not pause_disease
  mp.osd_message("Pause disease " .. (pause_disease and "activated" or "deactived"), 3)
end


mp.add_key_binding("ctrl+p", toggle_pause_disease)
mp.observe_property("sub-text", 'string', pause)