mirror of https://github.com/mpv-player/mpv
114 lines
3.9 KiB
Lua
114 lines
3.9 KiB
Lua
-- This script uses the lavfi cropdetect filter to automatically
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-- insert a crop filter with appropriate parameters for the currently
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-- playing video.
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--
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-- It registers the key-binding "C" (shift+c), which when pressed,
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-- inserts the filter vf=lavfi=cropdetect. After 1 second, it then
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-- inserts the filter vf=crop=w:h:x:y, where w,h,x,y are determined
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-- from the vf-metadata gathered by cropdetect. The cropdetect filter
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-- is removed immediately after the crop filter is inserted as it is
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-- no longer needed.
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--
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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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--
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-- Since the crop parameters are determined from the 1 second of video
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-- between inserting the cropdetect and crop filters, the "C" key
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-- should be pressed at a position in the video where the crop region
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-- is unambiguous (i.e., not a black frame, black background title
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-- card, or dark scene).
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--
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-- The default delay between insertion of the cropdetect and
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-- crop filters may be overridden by adding
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--
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-- --script-opts=autocrop.detect_seconds=<number of seconds>
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--
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-- to mpv's arguments. This may be desirable to allow cropdetect more
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-- time to collect data.
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require "mp.msg"
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script_name = mp.get_script_name()
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cropdetect_label = string.format("%s-cropdetect", script_name)
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crop_label = string.format("%s-crop", script_name)
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-- number of seconds to gather cropdetect data
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detect_seconds = tonumber(mp.get_opt(string.format("%s.detect_seconds", script_name)))
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if not detect_seconds then
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detect_seconds = 1
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end
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function del_filter_if_present(label)
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-- necessary because mp.command('vf del @label:filter') raises an
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-- error if the filter doesn't exist
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local vfs = mp.get_property_native("vf")
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for i,vf in pairs(vfs) do
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if vf["label"] == label then
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table.remove(vfs, i)
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mp.set_property_native("vf", vfs)
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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 autocrop_start()
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-- exit if cropdetection is already in progress
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if timer then
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mp.msg.warn("already cropdetecting!")
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return
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end
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-- if there's a crop filter, remove it and exit
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if del_filter_if_present(crop_label) then
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return
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end
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-- insert the cropdetect filter
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ret=mp.command(
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string.format(
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'vf add @%s:lavfi=graph="cropdetect=limit=24:round=2:reset=0"',
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cropdetect_label
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)
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)
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-- wait to gather data
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timer=mp.add_timeout(detect_seconds, do_crop)
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end
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function do_crop()
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-- get the metadata
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local cropdetect_metadata = mp.get_property_native(
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string.format("vf-metadata/%s", cropdetect_label)
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)
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-- use it to crop if its valid
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if cropdetect_metadata then
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if cropdetect_metadata["lavfi.cropdetect.w"]
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and cropdetect_metadata["lavfi.cropdetect.h"]
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and cropdetect_metadata["lavfi.cropdetect.x"]
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and cropdetect_metadata["lavfi.cropdetect.y"]
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then
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mp.command(string.format("vf add @%s:crop=%s:%s:%s:%s",
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crop_label,
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cropdetect_metadata["lavfi.cropdetect.w"],
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cropdetect_metadata["lavfi.cropdetect.h"],
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cropdetect_metadata["lavfi.cropdetect.x"],
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cropdetect_metadata["lavfi.cropdetect.y"]))
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else
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mp.msg.error(
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"Got empty crop data. You might need to increase detect_seconds."
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)
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end
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else
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mp.msg.error(
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"No crop data. Was the cropdetect filter successfully inserted?"
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)
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mp.msg.error(
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"Does your version of ffmpeg/libav support AVFrame metadata?"
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)
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end
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-- remove the cropdetect filter
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del_filter_if_present(cropdetect_label)
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timer=nil
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end
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mp.add_key_binding("C", "auto_crop", autocrop_start)
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