slicing lua windows fix

local msg = require "mp.msg"
local utils = require "mp.utils"
local options = require "mp.options"

local cut_pos = nil
local copy_audio = false

local o = {
    command_template = [[

        ffmpeg -y -ss $shift -i "$in"  -t $duration
         $sub $video $audio $pixfmt $options
         $quality "$dir$out.webm"
    ]],
} -- ffmpeg base argument

options.read_options(o)

function timestamp(duration)
    local hours = duration / 3600
    local minutes = duration % 3600 / 60
    local seconds = duration % 60
    return string.format("%02d:%02d:%02.03f", hours, minutes, seconds)
end

function osd(str)
    return mp.osd_message(str, 3)
end


function escape(str)
    return str:gsub("'", "'\\''")
end

function trim(str)
    return str:gsub("^%s+", ""):gsub("%s+$", "")
end


function cut(shift, endpos)
    local cmd = trim(o.command_template:gsub("%s+", " "))
    local inpath = escape(utils.join_path(
        utils.getcwd(),
        mp.get_property("stream-path")))
    local outpath = os.time() --- file names will be named according to unix timestamp


    cmd = cmd:gsub("$shift", shift)
    cmd = cmd:gsub("$duration", endpos - shift)
    cmd = cmd:gsub("$audio", copy_audio and "-c:a libvorbis " or "-an") --audio codec
    cmd = cmd:gsub("$video", "-c:v libvpx") -- vpx8 for webm 4ch compatible
    cmd = cmd:gsub("$sub", "-sn") --disabled sub because reasons

    cmd = cmd:gsub("$pixfmt", "-pix_fmt yuv420p") --color
    cmd = cmd:gsub("$options", "-threads 8 -slices 4") --threads option
    cmd = cmd:gsub("$quality", "-qmin 0 -crf 10 -b:v 1500K -qmax 30 -qcomp 0") --quality options
    cmd = cmd:gsub("$dir", "A:\\") --- output directory change here
    cmd = cmd:gsub("$out", outpath)
    cmd = cmd:gsub("$in", inpath, 1)



    msg.info(cmd)
    os.execute(cmd)
end

function toggle_mark()
    local pos = mp.get_property_number("time-pos")
    if cut_pos then
        local shift, endpos = cut_pos, pos
        if shift > endpos then
            shift, endpos = endpos, shift
        end
        if shift == endpos then
            osd("Cut fragment is empty")
        else
            cut_pos = nil
            osd(string.format("Cut fragment: %s - %s",
                timestamp(shift),
                timestamp(endpos)))
            cut(shift, endpos)
        end
    else
        cut_pos = pos
        osd(string.format("Marked %s as start position", timestamp(pos)))
    end
end

function toggle_audio()
    copy_audio = not copy_audio
    osd("Audio capturing is " .. (copy_audio and "enabled" or "disabled"))
end

function toggle_subtitle()
    copy_subtitle = not copy_subtitle
    osd("Subtitle is " .. (copy_subtitle and "enabled" or "disabled"))
end


mp.add_key_binding("c", "slicing_mark", toggle_mark)
mp.add_key_binding("a", "slicing_audio", toggle_audio)