mpv user-script to cycle between lavfi's denoise filters, tested over mpv 0.25.0-58-g99cef59fc

cycle-denoise.lua

-- settings
-- key_binding: press the key specified below
--      to cycle between denoise filters below,
--      set it to nil to disable the binding
local key_binding = "n"
-- key_binding_reverse cycle between denoise filters below
--      in reverse order, set it to nil to disable the binding,
--      set it to a single-char string to enable
local key_binding_reverse = nil

-- denoisers: specify names of denoise libavfilter filters
--     from `mpv --vf=lavfi=help` command
--     where the last 3 filters (dctdnoiz, owdenoise, nlmeans)
--     are too slow to be used in playback
local denoisers = {
    "removegrain"
    ,"atadenoise"
    ,"hqdn3d"
    ,"vaguedenoiser"
--    ,"dctdnoiz"
--    ,"owdenoise"
--    ,"nlmeans"
}

local denoiser_count = #denoisers
local filter_index = 0
local script_name = mp.get_script_name()
local denoise_label = string.format("%s-denoise", script_name)

-- from https://github.com/mpv-player/mpv/blob/39e04e929483847a3e0722d86d53f69837ed99db/TOOLS/lua/autocrop.lua
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 cycle_denoise()
    if not del_filter_if_present(denoise_label) then
        filter_index = 0
    end

    filter_index = filter_index + 1
    if filter_index > denoiser_count then
        mp.osd_message("denoise filters removed", osd_time)
        return
    end

    -- insert the filter
    mp.command(
        string.format(
            'vf add @%s:lavfi=graph="%s"',
            denoise_label, denoisers[filter_index]
        )
    )

end

function cycle_denoise_reverse()
    if not del_filter_if_present(denoise_label) then
        filter_index = denoiser_count
    else
        filter_index = filter_index - 1
    end

    if filter_index < 1 then
        mp.osd_message("denoise filters removed", osd_time)
        return
    end

    -- insert the filter
    mp.command(
        string.format(
            'vf add @%s:lavfi=graph="%s"',
            denoise_label, denoisers[filter_index]
        )
    )

end

if key_binding then
    mp.add_key_binding(key_binding, "denoise", cycle_denoise)
end

if key_binding_reverse then
    mp.add_key_binding(key_binding_reverse, "denoise-reverse", cycle_denoise_reverse)
end

@myfreeer That is exactly why I asked. Doesn't work with no-input-default-bindings

@myfreeer That is exactly why I asked. Doesn't work with no-input-default-bindings

@veganomy You'll need to change mp.add_key_binding to mp.add_forced_key_binding in line 89 and 93 according to the doc

Why not just use forced function in your script? Like what's the point of preventing the bindings from users who do no-input-default-bindings ? Like I don't even use n binding and the script doesn't work.