OBS Lua: Sound notification on replay buffer save [Windows]

README.md

A simple Lua script which plays a .wav sound whenever replay buffer is saved.

Installation

1. Download Half-Life 2 City Scanner NPC's camera shutter sound: https://github.com/sourcesounds/hl2/blob/master/sound/npc/scanner/scanner_photo1.wav

   • Or use any .wav sound but make sure to match its name either in "Beep on replay buffer save.lua" (edit with any text editor) or rename your .wav file to "sound_npc_scanner_scanner_photo1.wav".

2. Put it in the same location with "Beep on replay buffer save.lua"

   • A good way is to create a separate "scripts" folder in %AppData%\obs-studio\ and keep all your scripts there in case you need to backup your OBS Settings.

3. OBS → Tools → Scripts → +

This Lua script was downloaded from https://gist.github.com/snakecase/e816384a071cec31efbb4b9e429c108d

Credits:

• upgradeQ
• gima
• AkazaRenn

Thank you guys!

Beep on replay buffer save.lua

local obs = obslua
local ffi = require("ffi")
local winmm = ffi.load("Winmm")

-- Put a sound of your choosing next to "Beep on replay save.lua" and don't forget to match its name either in code below or rename your file.
PROP_AUDIO_FILEPATH = script_path() .. "sound_npc_scanner_scanner_photo1.wav"

ffi.cdef[[
    bool PlaySound(const char *pszSound, void *hmod, uint32_t fdwSound);
]]

function playsound(filepath)
    winmm.PlaySound(filepath, nil, 0x00020000)
end

function on_event(event) 
  if event == obs.OBS_FRONTEND_EVENT_REPLAY_BUFFER_SAVED 
    then playsound(PROP_AUDIO_FILEPATH) 
  end 
end

function script_load(settings)
  obs.obs_frontend_add_event_callback(on_event)
end

-- This Lua script was downloaded from https://gist.github.com/snakecase/e816384a071cec31efbb4b9e429c108d

-- Credits: upgradeQ (https://gist.github.com/upgradeQ/b2412242d76790d7618d6b0996c4562f), gima (https://gitlab.com/gima/obsnotification)
-- Thank you guys!

Sorry for the late reply. To stop this sound from showing up in recordings you either have to:
A. Reroute playback of this sound to some other device/software channel (not sure it's possible) via code which I have no clue how to implement
B. Record audio only from applications of your preference which can be done via OBS → Sources → Add → Application Audio Capture (BETA). This should work but will require setup each time you change applications (e.g. playing different games)

Regarding issues with playback, I have now tested this script in Win 11 Pro, and it works just fine, as well as in Win 10.