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1. Instant Replay System
2. Instant Replay Program

Instant Replay OBS Studio
This plugin is designed to provide the ability to add Instant Replays into a live stream.
It's effectively a combination of the 'Automatic Scene Switching' and 'Per Scene Volume' (from OBS Classic) plugins to allow instant replays in live streams.
It's designed to work along side a Stinger Transition, but it will function with cuts or fades or what have you.
An example:

Settings (Tools -> Instant Replay Settings):

Fill out the settings as desired.

• Enable - Enables/disable the plugins
• Write Pause (s) - Pause to allow OBS to write the replay file. OBS can't instantly write a file. ~10 seconds should be okay. Find something that works for you
• Transition Pause (ms) - Length of the transition in milliseconds. If the stinger is at 30fps, multiply the number of frames by 33. If the stinger is at 60fps, multiply the number of frames by 16.
• Replay Length (s) - Length of the replay in seconds. OBS does not always write as much replay as you tell it to so this may need to be a second or two shorter than the buffer length.
• Replay Scene - Scene to switch to that has the replay source.
• Mute Desktop Audio - Mute the Desktop Audio channels when replay is playing.
  
• Mute Mic/Aux - Mute the Mic/Aux channels when replay is playing

Hotkey (Settings -> Hotkeys):
Find the 'Instant Replay' hotkey (highlighted above in red). Set it TO THE SAME KEY as you have 'Save Replay' (highlighted in orange).
Setting up the replay source:
Set your Recording to a constant name (so remove all the % stuff). Makes it easy to point your replay source to a file that will exist. Point your Media Source to what your replay will be saved as.
Installation
+WINDOWS
Windows is built and working for both 32bit and 64bit
Drag and drop obs-studio folder into C:Program Files
(or wher ever you have obs-studio installed)

Instant Replay System

Merge all files down and you should be good to go.
+LINUX
Dependancies:
OBS (duh)
Qt5 dev
Clone the git repo:
cd to where you downloaded the source

Instant Replay Program

Check the environment PATHS in Makefile
- Make sure they match your OBS and Qt5 installations and fix if necessary.
(OBS_API_INCLUDE will not need updating as the files are in the git repo)
Then run:
+MAC
Uh, sould work. Probably. Maybe. Don't have a MAC to test with.
So..
You can try the LINUX instructions.
Let me know if you get it to work!
As ever, if you want to see how bad my coding is, source code is available on GitHub