-- 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" local script_name = mp.get_script_name()local detect_label = string.format("%s-detect", script_name)local pullup_label = string.format("%s", script_name)local dominance_label = string.format("%s-dominance", script_name)local ivtc_detect_label = string.format("%s-ivtc-detect", script_name)local timerlocal progressive, interlaced_tff, interlaced_bff, interlaced = 0, 1, 2, 3 -- number of seconds to gather cropdetect datalocal detect_seconds = tonumber(mp.get_opt(string.format("%s.detect_seconds", script_name)))if not detect_seconds then    detect_seconds = 4end local 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 falseend local function add_vf(label, filter)    return mp.command(('vf add @%s:%s'):format(label, filter))end local function stop_detect()    del_filter_if_present(detect_label)    del_filter_if_present(ivtc_detect_label)    timer = nilend local 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    endend local 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("interlaced with " .. dominance ..                    " field dominance: setting deinterlace property")        del_filter_if_present(pullup_label)        mp.set_property("deinterlace","yes")        stop_detect()    endend local 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 mp.add_key_binding("ctrl+d", script_name, start_detect)