mirror of https://github.com/mpv-player/mpv
330 lines
9.1 KiB
Lua
330 lines
9.1 KiB
Lua
--[[
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This script uses the lavfi cropdetect filter to automatically
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insert a crop filter with appropriate parameters for the
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currently playing video.
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It will automatically crop the video, when playback starts.
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Also It registers the key-binding "C" (shift+c). You can manually
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crop the video by pressing the "C" (shift+c) key.
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If the "C" key is pressed again, the crop filter is removed
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restoring playback to its original state.
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The workflow is as follows: First, it inserts the filter
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vf=lavfi=cropdetect. After <detect_seconds> (default is 1)
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seconds, it then inserts the filter vf=crop=w:h:x:y, where
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w,h,x,y are determined from the vf-metadata gathered by
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cropdetect. The cropdetect filter is removed immediately after
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the crop filter is inserted as it is no longer needed.
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Since the crop parameters are determined from the 1 second of
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video between inserting the cropdetect and crop filters, the "C"
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key should be pressed at a position in the video where the crop
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region is unambiguous (i.e., not a black frame, black background
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title card, or dark scene).
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The default options can be overridden by adding
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script-opts-append=autocrop-<parameter>=<value> into mpv.conf
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List of available parameters (For default values, see <options>)：
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auto: bool - Whether to automatically apply crop at the start of
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playback. If you don't want to crop automatically, set it to
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false or add "script-opts-append=autocrop-auto=no" into
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mpv.conf.
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auto_delay: seconds - Delay before starting crop in auto mode.
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You can try to increase this value to avoid dark scene or
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fade in at beginning. Automatic cropping will not occur if
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the value is larger than the remaining playback time.
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detect_limit: number[0-255] - Black threshold for cropdetect.
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Smaller values will generally result in less cropping.
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See limit of https://ffmpeg.org/ffmpeg-filters.html#cropdetect
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detect_round: number[2^n] - The value which the width/height
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should be divisible by. Smaller values have better detection
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accuracy. If you have problems with other filters,
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you can try to set it to 4 or 16.
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See round of https://ffmpeg.org/ffmpeg-filters.html#cropdetect
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detect_min_ratio: number[0.0-1.0] - The ratio of the minimum clip
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size to the original. If the picture is over cropped or under
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cropped, try adjusting this value.
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detect_seconds: seconds - How long to gather cropdetect data.
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Increasing this may be desirable to allow cropdetect more
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time to collect data.
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suppress_osd: bool - Whether the OSD shouldn't be used when filters
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are applied and removed.
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--]]
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require "mp.msg"
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require 'mp.options'
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local options = {
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auto = true,
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auto_delay = 4,
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detect_limit = "24/255",
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detect_round = 2,
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detect_min_ratio = 0.5,
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detect_seconds = 1,
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suppress_osd = false,
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}
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read_options(options)
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local label_prefix = mp.get_script_name()
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local labels = {
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crop = string.format("%s-crop", label_prefix),
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cropdetect = string.format("%s-cropdetect", label_prefix)
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}
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timers = {
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auto_delay = nil,
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detect_crop = nil
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}
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local command_prefix = options.suppress_osd and 'no-osd' or ''
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function is_filter_present(label)
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local filters = mp.get_property_native("vf")
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for index, filter in pairs(filters) do
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if filter["label"] == label then
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return true
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end
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end
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return false
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end
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function is_enough_time(seconds)
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-- Plus 1 second for deviation.
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local time_needed = seconds + 1
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local playtime_remaining = mp.get_property_native("playtime-remaining")
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return playtime_remaining and time_needed < playtime_remaining
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end
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function is_cropable()
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for _, track in pairs(mp.get_property_native('track-list')) do
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if track.type == 'video' and track.selected then
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return not track.albumart
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end
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end
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return false
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end
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function remove_filter(label)
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if is_filter_present(label) then
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mp.command(string.format('%s vf remove @%s', command_prefix, label))
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return true
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end
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return false
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end
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function cleanup()
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-- Remove all existing filters.
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for key, value in pairs(labels) do
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remove_filter(value)
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end
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-- Kill all timers.
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for index, timer in pairs(timers) do
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if timer then
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timer:kill()
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timer = nil
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end
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end
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end
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function detect_crop()
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-- If it's not cropable, exit.
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if not is_cropable() then
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mp.msg.warn("autocrop only works for videos.")
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return
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end
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-- Verify if there is enough time to detect crop.
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local time_needed = options.detect_seconds
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if not is_enough_time(time_needed) then
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mp.msg.warn("Not enough time to detect crop.")
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return
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end
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-- Insert the cropdetect filter.
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local limit = options.detect_limit
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local round = options.detect_round
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mp.command(
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string.format(
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'%s vf pre @%s:cropdetect=limit=%s:round=%d:reset=0',
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command_prefix, labels.cropdetect, limit, round
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)
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)
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-- Wait to gather data.
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timers.detect_crop = mp.add_timeout(time_needed, detect_end)
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end
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function detect_end()
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-- Get the metadata and remove the cropdetect filter.
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local cropdetect_metadata =
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mp.get_property_native(
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string.format("vf-metadata/%s",
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labels.cropdetect
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)
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)
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remove_filter(labels.cropdetect)
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-- Remove the timer of detect crop.
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if timers.detect_crop then
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timers.detect_crop:kill()
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timers.detect_crop = nil
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end
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local meta = {}
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-- Verify the existence of metadata.
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if cropdetect_metadata then
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meta = {
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w = cropdetect_metadata["lavfi.cropdetect.w"],
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h = cropdetect_metadata["lavfi.cropdetect.h"],
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x = cropdetect_metadata["lavfi.cropdetect.x"],
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y = cropdetect_metadata["lavfi.cropdetect.y"],
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}
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else
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mp.msg.error("No crop data.")
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mp.msg.info("Was the cropdetect filter successfully inserted?")
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mp.msg.info("Does your version of ffmpeg/libav support AVFrame metadata?")
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return
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end
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-- Verify that the metadata meets the requirements and convert it.
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if meta.w and meta.h and meta.x and meta.y then
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local width = mp.get_property_native("width")
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local height = mp.get_property_native("height")
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meta = {
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w = tonumber(meta.w),
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h = tonumber(meta.h),
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x = tonumber(meta.x),
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y = tonumber(meta.y),
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min_w = width * options.detect_min_ratio,
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min_h = height * options.detect_min_ratio,
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max_w = width,
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max_h = height
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}
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else
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mp.msg.error("Got empty crop data.")
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mp.msg.info("You might need to increase detect_seconds.")
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return
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end
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apply_crop(meta)
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end
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function apply_crop(meta)
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-- Verify if it is necessary to crop.
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local is_effective = meta.x > 0 or meta.y > 0
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or meta.w < meta.max_w or meta.h < meta.max_h
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if not is_effective then
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mp.msg.info("No area detected for cropping.")
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return
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end
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-- Verify it is not over cropped.
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local is_excessive = meta.w < meta.min_w and meta.h < meta.min_h
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if is_excessive then
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mp.msg.info("The area to be cropped is too large.")
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mp.msg.info("You might need to decrease detect_min_ratio.")
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return
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end
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-- Remove existing crop.
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remove_filter(labels.crop)
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-- Apply crop.
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mp.command(
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string.format("%s vf pre @%s:lavfi-crop=w=%s:h=%s:x=%s:y=%s",
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command_prefix, labels.crop, meta.w, meta.h, meta.x, meta.y
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)
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)
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end
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function on_start()
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-- Clean up at the beginning.
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cleanup()
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-- If auto is not true, exit.
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if not options.auto then
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return
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end
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-- If it is the beginning, wait for detect_crop
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-- after auto_delay seconds, otherwise immediately.
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local playback_time = mp.get_property_native("playback-time")
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local is_delay_needed = playback_time
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and options.auto_delay > playback_time
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if is_delay_needed then
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-- Verify if there is enough time for autocrop.
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local time_needed = options.auto_delay + options.detect_seconds
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if not is_enough_time(time_needed) then
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mp.msg.warn("Not enough time for autocrop.")
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return
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end
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timers.auto_delay = mp.add_timeout(time_needed,
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function()
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detect_crop()
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-- Remove the timer of auto delay.
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timers.auto_delay:kill()
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timers.auto_delay = nil
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end
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)
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else
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detect_crop()
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end
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end
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function on_toggle()
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-- If it is during auto_delay, kill the timer.
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if timers.auto_delay then
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timers.auto_delay:kill()
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timers.auto_delay = nil
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end
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-- Cropped => Remove it.
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if remove_filter(labels.crop) then
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return
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end
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-- Detecting => Leave it.
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if timers.detect_crop then
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mp.msg.warn("Already cropdetecting!")
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return
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end
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-- Neither => Do delectcrop.
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detect_crop()
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end
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mp.add_key_binding("C", "toggle_crop", on_toggle)
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mp.register_event("end-file", cleanup)
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mp.register_event("file-loaded", on_start)
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