mpv_get_mouse_coord_v02

capture = {}
local gp
if mp.get_property == nil then
    gp = mp.property_get
else
    gp = mp.get_property
end
function capture.handler()
    local c = capture
    local osd_w, osd_h = mp.get_osd_size()
    local x, y = mp.get_mouse_pos()
    local rw = mp.get_property("width")
    local rh = mp.get_property("height")
    local ml = mp.get_property("osd-dimensions/ml")
    local mt = mp.get_property("osd-dimensions/mt")
    x = ( x - ml ) * rw / ( osd_w - 2 * ml )
    y = ( y - mt ) * rh / ( osd_h - 2 * mt )
    if c.trig then
        mp.commandv("show-text", string.format("coord 2 x=%d ; y=%d" , x, y))
        local f = assert(io.open("/tmp/webm_crop2", "w"))
        f:write(string.format("%d:%d", x, y))
        f:close()
        c.trig = nil
    else
        mp.commandv("show-text", string.format("coord 1 x=%d ; y=%d" , x, y))
        local f = assert(io.open("/tmp/webm_crop1", "w"))
        f:write(string.format("%d:%d", x, y))
        f:close()
        c.trig = 1
    end
end
mp.add_forced_key_binding("F9", capture.handler)
if bindings_enabled then toggle_bindings(true, true) end