--[[This script uses the lavfi cropdetect filter and the video-crop property toautomatically crop the currently playing video with appropriate parameters. It automatically crops the video when playback starts. You can also manually crop the video by pressing the "C" (shift+c) key.Pressing it again undoes the crop. The workflow is as follows: First, it inserts the cropdetect filter. After<detect_seconds> (default is 1) seconds, it then sets video-crop based on thevf-metadata values gathered by cropdetect. The cropdetect filter is removedafter video-crop is set as it is no longer needed. Since the crop parameters are determined from the 1 second of video betweeninserting the cropdetect filter and setting video-crop, the "C" key should bepressed at a position in the video where the crop region is unambiguous (i.e.,not a black frame, black background title card, or dark scene). If non-copy-back hardware decoding is in use, hwdec is temporarily disabled forthe duration of cropdetect as the filter would fail otherwise. These are the default options. They can be overridden by addingscript-opts-append=autocrop-<parameter>=<value> to mpv.conf.--]]local options = {    -- Whether to automatically apply crop at the start of playback. If you    -- don't want to crop automatically, add    -- script-opts-append=autocrop-auto=no to mpv.conf.    auto = true,    -- Delay before starting crop in auto mode. You can try to increase this    -- value to avoid dark scenes or fade ins at beginning. Automatic cropping    -- will not occur if the value is larger than the remaining playback time.    auto_delay = 4,    -- Black threshold for cropdetect. Smaller values will generally result in    -- less cropping. See limit of    -- https://ffmpeg.org/ffmpeg-filters.html#cropdetect    detect_limit = "24/255",    -- The value which the width/height should be divisible by. Smaller    -- values have better detection accuracy. If you have problems with    -- other filters, you can try to set it to 4 or 16. See round of    -- https://ffmpeg.org/ffmpeg-filters.html#cropdetect    detect_round = 2,    -- The ratio of the minimum clip size to the original. A number from 0 to    -- 1. If the picture is over cropped, try adjusting this value.    detect_min_ratio = 0.5,    -- How long to gather cropdetect data. Increasing this may be desirable to    -- allow cropdetect more time to collect data.    detect_seconds = 1,    -- Whether the OSD shouldn't be used when cropdetect and video-crop are    -- applied and removed.    suppress_osd = false,} require "mp.options".read_options(options) local cropdetect_label = mp.get_script_name() .. "-cropdetect" local timers = {    auto_delay = nil,    detect_crop = nil} local hwdec_backup local command_prefix = options.suppress_osd and 'no-osd' or '' local function is_enough_time(seconds)    -- Plus 1 second for deviation.    local time_needed = seconds + 1    local playtime_remaining = mp.get_property_native("playtime-remaining")     return playtime_remaining and time_needed < playtime_remainingend local function is_cropable(time_needed)    if mp.get_property_native('current-tracks/video/image') ~= false then        mp.msg.warn("autocrop only works for videos.")        return false    end     if not is_enough_time(time_needed) then        mp.msg.warn("Not enough time to detect crop.")        return false    end     return trueend local function remove_cropdetect()    for _, filter in pairs(mp.get_property_native("vf")) do        if filter.label == cropdetect_label then            mp.command(                string.format("%s vf remove @%s", command_prefix, filter.label))             return        end    endend local function restore_hwdec()    if hwdec_backup then        mp.set_property("hwdec", hwdec_backup)        hwdec_backup = nil    endend local function cleanup()    remove_cropdetect()     -- Kill all timers.    for index, timer in pairs(timers) do        if timer then            timer:kill()            timers[index] = nil        end    end     restore_hwdec()end local function apply_crop(meta)    -- Verify if it is necessary to crop.    local is_effective = meta.w and meta.h and meta.x and meta.y and                         (meta.x > 0 or meta.y > 0                         or meta.w < meta.max_w or meta.h < meta.max_h)     -- Verify it is not over cropped.    local is_excessive = false    if is_effective and (meta.w < meta.min_w or meta.h < meta.min_h) then        mp.msg.info("The area to be cropped is too large.")        mp.msg.info("You might need to decrease detect_min_ratio.")        is_excessive = true    end     if not is_effective or is_excessive then        -- Clear any existing crop.        mp.command(string.format("%s set file-local-options/video-crop ''", command_prefix))        return    end     -- Apply crop.    mp.command(string.format("%s set file-local-options/video-crop %sx%s+%s+%s",                             command_prefix, meta.w, meta.h, meta.x, meta.y))end local function detect_end()    -- Get the metadata and remove the cropdetect filter.    local cropdetect_metadata = mp.get_property_native(        "vf-metadata/" .. cropdetect_label)    remove_cropdetect()     -- Remove the timer of detect crop.    if timers.detect_crop then        timers.detect_crop:kill()        timers.detect_crop = nil    end     restore_hwdec()     local meta     -- Verify the existence of metadata.    if cropdetect_metadata then        meta = {            w = cropdetect_metadata["lavfi.cropdetect.w"],            h = cropdetect_metadata["lavfi.cropdetect.h"],            x = cropdetect_metadata["lavfi.cropdetect.x"],            y = cropdetect_metadata["lavfi.cropdetect.y"],        }    else        mp.msg.error("No crop data.")        mp.msg.info("Was the cropdetect filter successfully inserted?")        mp.msg.info("Does your version of FFmpeg support AVFrame metadata?")        return    end     -- Verify that the metadata meets the requirements and convert it.    if meta.w and meta.h and meta.x and meta.y then        local width = mp.get_property_native("width")        local height = mp.get_property_native("height")         meta = {            w = tonumber(meta.w),            h = tonumber(meta.h),            x = tonumber(meta.x),            y = tonumber(meta.y),            min_w = width * options.detect_min_ratio,            min_h = height * options.detect_min_ratio,            max_w = width,            max_h = height        }    else        mp.msg.error("Got empty crop data.")        mp.msg.info("You might need to increase detect_seconds.")    end     apply_crop(meta)end local function detect_crop()    local time_needed = options.detect_seconds     if not is_cropable(time_needed) then        return    end     local hwdec_current = mp.get_property("hwdec-current")    if hwdec_current:find("-copy$") == nil and hwdec_current ~= "no" and       hwdec_current ~= "crystalhd" and hwdec_current ~= "rkmpp" then        hwdec_backup = mp.get_property("hwdec")        mp.set_property("hwdec", "no")    end     -- Insert the cropdetect filter.    local limit = options.detect_limit    local round = options.detect_round     mp.command(        string.format(            '%s vf pre @%s:cropdetect=limit=%s:round=%d:reset=0',            command_prefix, cropdetect_label, limit, round        )    )     -- Wait to gather data.    timers.detect_crop = mp.add_timeout(time_needed, detect_end)end local function on_start()     -- Clean up at the beginning.    cleanup()     -- If auto is not true, exit.    if not options.auto then        return    end     -- If it is the beginning, wait for detect_crop    -- after auto_delay seconds, otherwise immediately.    local playback_time = mp.get_property_native("playback-time")    local is_delay_needed = playback_time        and options.auto_delay > playback_time     if is_delay_needed then         -- Verify if there is enough time for autocrop.        local time_needed = options.auto_delay + options.detect_seconds         if not is_cropable(time_needed) then            return        end         timers.auto_delay = mp.add_timeout(time_needed,            function()                detect_crop()                 -- Remove the timer of auto delay.                timers.auto_delay:kill()                timers.auto_delay = nil            end        )    else        detect_crop()    endend local function on_toggle()     -- If it is during auto_delay, kill the timer.    if timers.auto_delay then        timers.auto_delay:kill()        timers.auto_delay = nil    end     -- Cropped => Remove it.    if mp.get_property("video-crop") ~= "" then        mp.command(string.format("%s set file-local-options/video-crop ''", command_prefix))        return    end     -- Detecting => Leave it.    if timers.detect_crop then        mp.msg.warn("Already cropdetecting!")        return    end     -- Neither => Detect crop.    detect_crop()end mp.add_key_binding("C", "toggle_crop", on_toggle)mp.register_event("end-file", cleanup)mp.register_event("file-loaded", on_start)