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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 filters
-- ``vf=idet,lavfi-pullup,idet``. After 4 seconds, it removes these
-- filters and decides whether the content is progressive, interlaced, or
-- telecined and the interlacing field dominance.
--
-- Based on this information, it may set mpv's ``deinterlace`` property (which
-- usually inserts the bwdif filter), or insert the ``pullup`` filter if the
-- content is telecined. It also sets field dominance with lavfi setfield.
--
-- OPTIONS:
-- The default detection time may be overridden by adding
--
-- --script-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
require "mp.msg"
script_name = mp.get_script_name()
detect_label = string.format("%s-detect", script_name)
pullup_label = string.format("%s", script_name)
dominance_label = string.format("%s-dominance", script_name)
ivtc_detect_label = string.format("%s-ivtc-detect", 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
local function add_vf(label, filter)
return mp.command(('vf add @%s:%s'):format(label, filter))
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)
del_filter_if_present(dominance_label)
-- insert the detection filters
if not (add_vf(detect_label, 'idet') and
add_vf(dominance_label, 'setfield=mode=auto') and
add_vf(pullup_label, 'lavfi-pullup') and
add_vf(ivtc_detect_label, 'idet')) then
mp.msg.error("failed to insert detection filters")
return
end
-- wait to gather data
timer = mp.add_timeout(detect_seconds, select_filter)
end
function stop_detect()
del_filter_if_present(detect_label)
del_filter_if_present(ivtc_detect_label)
timer = nil
end
progressive, interlaced_tff, interlaced_bff, interlaced = 0, 1, 2, 3, 4
function judge(label)
-- get the metadata
local result = mp.get_property_native(string.format("vf-metadata/%s", label))
local num_tff = tonumber(result["lavfi.idet.multiple.tff"])
local num_bff = tonumber(result["lavfi.idet.multiple.bff"])
local num_progressive = tonumber(result["lavfi.idet.multiple.progressive"])
local num_undetermined = tonumber(result["lavfi.idet.multiple.undetermined"])
local num_interlaced = num_tff + num_bff
local num_determined = num_interlaced + num_progressive
mp.msg.verbose(label.." progressive = "..num_progressive)
mp.msg.verbose(label.." interlaced-tff = "..num_tff)
mp.msg.verbose(label.." interlaced-bff = "..num_bff)
mp.msg.verbose(label.." 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 select_filter()
-- handle the first detection filter results
local verdict = judge(detect_label)
local ivtc_verdict = judge(ivtc_detect_label)
local dominance = "auto"
if verdict == progressive then
mp.msg.info("progressive: doing nothing")
stop_detect()
del_filter_if_present(dominance_label)
del_filter_if_present(pullup_label)
return
else
if verdict == interlaced_tff then
dominance = "tff"
add_vf(dominance_label, 'setfield=mode='..dominance)
elseif verdict == interlaced_bff then
dominance = "bff"
add_vf(dominance_label, 'setfield=mode='..dominance)
else
del_filter_if_present(dominance_label)
end
end
-- handle the ivtc detection filter results
if ivtc_verdict == progressive then
mp.msg.info(string.format("telecined with %s field dominance: using pullup", dominance))
stop_detect()
else
mp.msg.info(string.format("interlaced with %s field dominance: setting deinterlace property", dominance))
del_filter_if_present(pullup_label)
mp.set_property("deinterlace","yes")
stop_detect()
end
end
mp.add_key_binding("ctrl+d", script_name, start_detect)
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