Creates .edl file for MPV player used here as a bookmarked playlist. Binds "x" so that first press is start of "bookmark" and second press is end of "bookmark." The file produced can then be played using "mpv --playlist=file.edl".

mpv-bookmarks.lua

function file_exists(playlist)
   local f=io.open(playlist, "r")
   if f~=nil then io.close(f) return true else return false end
end

function entry_complete(playlist)
	local f=io.open(playlist, "r")
	chars = f:read("*all")
	last_char = string.sub(chars, -1)
	if last_char == ";" then io.close(f) return true else return false end
end

function end_time(playlist, time)
	local f=io.open(playlist, "r")
	chars = f:read("*all")
	local start_time = chars:match(".+,(.+)")
	return time - start_time
end

function time_frame()
	
	time = mp.get_property("time-pos")
	path = mp.get_property("path")
	ext  = mp.get_property("filename")
	
	file_dir  = path:match("(.*[\\/\\/])")
	list_dir  = (file_dir .. "_playlists/")
	name = ext:match("([^.]+)")
	
	playlist = (list_dir .. name .. ".edl")

	if file_exists(playlist) == true then
		if entry_complete(playlist) == true then
			local file = io.open(playlist, "a")
			file:write(path .. "," .. time)
			file:close()
			mp.osd_message("Start")
		else
			local file = io.open(playlist, "a")
			file:write("," .. end_time(playlist, time) .. ";")
			file:close()
			mp.osd_message("End")
		end
	else		
		os.execute("mkdir " .. "\"" .. list_dir .. "\"")
		local file = io.open(playlist, "w")
		file:write("# mpv EDL v0\n" .. "edl://" .. path .. "," .. time)
		file:close()
		mp.osd_message("Start")
	end
end

function time_mark()
	
	time = mp.get_property("time-pos")
	path = mp.get_property("path")
	ext  = mp.get_property("filename")
	
	file_dir  = path:match("(.*[\\/\\/])")
	list_dir  = (file_dir .. "_playlists/")
	name = ext:match("([^.]+)")
	
	playlist = (list_dir .. name .. ".edl")

	if file_exists(playlist) == true then
		file = io.open(playlist, "a")
		file:write(path .. "," .. time .. ";")
		file:close()
		mp.osd_message("Marked Video")		
	else
		os.execute("mkdir " .. "\"" .. list_dir .. "\"")
		file = io.open(playlist, "w")
		file:write("# mpv EDL v0\n" .. "edl://" .. path .. "," .. time .. ";")
		file:close()
		mp.osd_message("Marked Video")		
	end
end

mp.add_key_binding("x", "time_frame", time_frame)
mp.add_key_binding("Shift+x", "time_mark", time_mark)