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-- This script uses the lavfi idet filter to automatically insert the
-- appropriate deinterlacing filter based on a short section of the
-- currently playing video.
--
-- It registers the key-binding ctrl+d, which when pressed, inserts
-- the filter vf=lavfi=idet. After 4 second, it examines the results
-- to determine whether the content progressive or interlaced and the
-- interlacing field dominance. It immediately sets the latter within
-- mpv.
--
-- If the content is judged not to be progressive, it may be either
-- interlaced or telecined. To determine which one, the video is
-- seeked back to the detection starting point with the "pullup"
-- filter inserted. After another four seconds, if idet thinks that
-- the pulled up viedo is "progressive", then pullup is the correct
-- filter and this script leaves it in places while removing the idet
-- filter. Otherwise, the content plain interlaced and mpv's deinterlace
-- property is set. This will usually insert the yadif deinterlacing filter.
--
-- The default detection time may be overridden by adding
--
-- --lua-opts=autodeint.detect_seconds=<number of seconds>
--
-- to mpv's arguments. This may be desirable to allow idet more
-- time to collect data.
--
-- To see counts of the various types of frames for each detection phase,
-- the verbosity can be increased with
--
-- --msg-level autodeint=v
--
-- This script requires a recent version of ffmpeg for which the idet
-- filter adds the required metadata.
require "mp.msg"
script_name = mp.get_script_name()
detect_label = string.format("%s-detect", script_name)
pullup_label = string.format("%s", script_name)
-- number of seconds to gather cropdetect data
detect_seconds = tonumber(mp.get_opt(string.format("%s.detect_seconds", script_name)))
if not detect_seconds then
detect_seconds = 4
end
function del_filter_if_present(label)
-- necessary because mp.command('vf del @label:filter') raises an
-- error if the filter doesn't exist
local vfs = mp.get_property_native("vf")
for i,vf in pairs(vfs) do
if vf["label"] == label then
table.remove(vfs, i)
mp.set_property_native("vf", vfs)
return true
end
end
return false
end
function start_detect()
-- exit if detection is already in progress
if timer then
mp.msg.warn("already detecting!")
return
end
mp.set_property("deinterlace","no")
del_filter_if_present(pullup_label)
percent_pos = mp.get_property("percent-pos")
-- insert the detection filter
local cmd = string.format('vf add @%s:lavfi=graph="idet"', detect_label)
if not mp.command(cmd) then
mp.msg.error("failed to insert detection filter")
return
end
-- wait to gather data
timer = mp.add_timeout(detect_seconds, judge_field_dominance)
end
function stop_detect()
del_filter_if_present(detect_label)
timer = nil
mp.set_property("playback-pos", percent_pos)
end
progressive, interlaced_tff, interlaced_bff, interlaced = 0, 1, 2, 3, 4
function judge()
-- get the metadata
local result = mp.get_property_native(string.format("vf-metadata/%s", detect_label))
num_tff = tonumber(result["lavfi.idet.multiple.tff"])
num_bff = tonumber(result["lavfi.idet.multiple.bff"])
num_progressive = tonumber(result["lavfi.idet.multiple.progressive"])
num_undetermined = tonumber(result["lavfi.idet.multiple.undetermined"])
num_interlaced = num_tff + num_bff
num_determined = num_interlaced + num_progressive
mp.msg.verbose("progressive = "..num_progressive)
mp.msg.verbose("interlaced-tff = "..num_tff)
mp.msg.verbose("interlaced-bff = "..num_bff)
mp.msg.verbose("undetermined = "..num_undetermined)
if num_determined < num_undetermined then
mp.msg.warn("majority undetermined frames")
end
if num_progressive > 20*num_interlaced then
return progressive
elseif num_tff > 10*num_bff then
return interlaced_tff
elseif num_bff > 10*num_tff then
return interlaced_bff
else
return interlaced
end
end
function judge_field_dominance()
verdict = judge()
if verdict == progressive then
stop_detect()
mp.msg.info("progressive: doing nothing")
return
elseif verdict == interlaced_tff then
mp.set_property("field-dominance", "top")
elseif verdict == interlaced_bff then
mp.set_property("field-dominance", "bottom")
elseif verdict == interlaced then
mp.set_property("field-dominance", "auto")
end
local cmd = string.format("vf pre @%s:pullup", pullup_label)
if not mp.command(cmd) then
mp.msg.error("failed to insert pullup filter")
stop_detect()
return
end
-- redo the detection with the pullup filter to see if it's telecined
mp.set_property("percent-pos", percent_pos)
timer = mp.add_timeout(detect_seconds, judge_ivtc)
end
function judge_ivtc()
verdict = judge()
if verdict == progressive then
mp.msg.info(string.format("telecinied with %s field dominance: using pullup", mp.get_property("field-dominance")))
stop_detect()
else
mp.msg.info(string.format("interlaced with %s field dominance: setting deinterlace property", mp.get_property("field-dominance")))
del_filter_if_present(pullup_label)
mp.set_property("deinterlace","yes")
stop_detect()
end
return
end
mp.add_key_binding("ctrl+d", script_name, start_detect)
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