Download plugin for both UE and OBS studio: Create Plugins folder in the UE project files: paste the plugin in it, mine is :
C:\Users\Admin\Documents\Unreal Projects\UE4_test\Plugins
Enable plugin: Off World Live Livestreaming camera
Drag OWL CineCam Capture in the scene,
Login to Off World Live
In OBS, add Spout Capture, select the OWL camera
If doesn’t show anything in OBS....
Click Off World Live arrow, create Cine Stream Wizard, name as Instant
Add OWL Spout Sender Manager → assign Source Render Target as Instant, tick Active
Create Spout camera into UE scene:
Add OWL Spout Receive Managerr in the scene → In Details → Spout Receiver, Add array element
→In Render Target → Render Target, name as SpunOutput (a material is created)
Assign the render target, tick active, and assign the Spout camera wanted in the scene at Name →
Livestream Alpha:
Project Setting → type alpha, choose follow: restart
Select the OWL cam capture want to use alpha → Alpha setting → tick Use Show Only List (a black frame is showed) → In Show only Actors → use the color picker to pick in the scene want to be appear in alpha channel (add more array element if more actors want to be appear)
Similarly, if untick Use Show Only list, and use picker for hidden only Actors (to hide unwanted actors)
When choose the OWL camera in OBS, select the Composite Mode to Premultiple Alpha
IF livestream with green screen, in OBS - >Filters → Chroma key