OBS track mattes but not in transitions?

[slowchase]

Hi. So I'm trying to achieve something in OBS that feels like it should be straight forward, but despite trawling YouTube for how-tos and fiddling with blending modes and the Advanced Mask and Dynamic Mask filters I have a tiny walnut brain and can't figure out how to do it.

I already have a bunch of track matte stinger transitions working nicely, no problem there - but I'm now looking to incorporate the same effect (i.e a black and white video file revealing one scene under another) but with different sources within one scene.

Particularly longer black and white video files.

Grateful for any explanations of how this can be achieved like I'm 5 years old, please and thank you.

 

[Suslik V]

Are you looking for right-click menu over the source Show Transition or Hide Transition options?

In case you are looking for "how it's made":

Stinger "Transition Point" not working

For some odd reason, despite setting a transition point, the next scene will still show up instantly when it's not supposed to. I tried looking up online if there was a way to fix this and got no results. I'm not sure if there's a setting I need to check to ensure it actually uses the transition...

obsproject.com

 

[slowchase]

Are you looking for right-click menu over the source Show Transition or Hide Transition options?

In case you are looking for "how it's made":

Stinger "Transition Point" not working

For some odd reason, despite setting a transition point, the next scene will still show up instantly when it's not supposed to. I tried looking up online if there was a way to fix this and got no results. I'm not sure if there's a setting I need to check to ensure it actually uses the transition...

obsproject.com

Hi - I want to create the same effect as track matte stinger transitions, but not in a transition. I'm looking to create track mattes within one scene, thanks.

 

[Suslik V]

Please, describe how it should look like.