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-- This script uses the lavfi cropdetect filter to automatically
-- insert a crop filter with appropriate parameters for the currently
-- playing video.
--
-- It registers the key-binding "C" (shift+c), which when pressed,
-- inserts the filter vf=lavfi=cropdetect. After 1 second, it then
-- inserts the filter vf=crop=w:h:x:y, where w,h,x,y are determined
-- from the vf-metadata gathered by cropdetect. The cropdetect filter
-- is removed immediately after the crop filter is inserted as it is
-- no longer needed.
--
-- If the "C" key is pressed again, the crop filter is removed
-- restoring playback to its original state.
--
-- Since the crop parameters are determined from the 1 second of video
-- between inserting the cropdetect and crop filters, the "C" key
-- should be pressed 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).
--
-- The default delay between insertion of the cropdetect and
-- crop filters may be overridden by adding
--
-- --lua-opts=autocrop.detect_seconds=<number of seconds>
--
-- to mpv's arguments. This may be desirable to allow cropdetect more
-- time to collect data.
require "mp.msg"
script_name = mp.get_script_name()
cropdetect_label = string.format("%s-cropdetect", script_name)
crop_label = string.format("%s-crop", 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 = 1
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
function autocrop_start()
-- exit if cropdetection is already in progress
if timer then
mp.msg.warn("already cropdetecting!")
return
end
-- if there's a crop filter, remove it and exit
if del_filter_if_present(crop_label) then
return
end
-- insert the cropdetect filter
ret=mp.command(
string.format(
'vf add @%s:lavfi=graph="cropdetect=limit=24:round=2:reset=0"',
cropdetect_label
)
)
-- wait to gather data
timer=mp.add_timeout(detect_seconds, do_crop)
end
function do_crop()
-- get the metadata
local cropdetect_metadata = mp.get_property_native(
string.format("vf-metadata/%s", cropdetect_label)
)
-- use it to crop if its valid
if cropdetect_metadata then
if cropdetect_metadata["lavfi.cropdetect.w"]
and cropdetect_metadata["lavfi.cropdetect.h"]
and cropdetect_metadata["lavfi.cropdetect.x"]
and cropdetect_metadata["lavfi.cropdetect.y"]
then
mp.command(string.format("vf add @%s:crop=%s:%s:%s:%s",
crop_label,
cropdetect_metadata["lavfi.cropdetect.w"],
cropdetect_metadata["lavfi.cropdetect.h"],
cropdetect_metadata["lavfi.cropdetect.x"],
cropdetect_metadata["lavfi.cropdetect.y"]))
else
mp.msg.error(
"Got empty crop data. You might need to increase detect_seconds."
)
end
else
mp.msg.error(
"No crop data. Was the cropdetect filter successfully inserted?"
)
mp.msg.error(
"Does your version of ffmpeg/libav support AVFrame metadata?"
)
end
-- remove the cropdetect filter
del_filter_if_present(cropdetect_label)
timer=nil
end
mp.add_key_binding("C", "auto_crop", autocrop_start)
|
