So I need some help. I have been trying to do some nuzlocke let's plays and have issues with recording. Currently I set everything up as a scene in Streamlabs OBS like I would for a stream and then hit record instead of live. The problem with this is in the post edit because everything is output as one .mp4 with one audio line.

This is difficult for edits as if I want to impose a focus on face cam for say an intro moment or a reaction on the post edit or if I need to cut audio for some reason or adjust the gameplay volume and my voice.

My question is what software should I be using to record gameplay video and audio as one file and then face cam video and audio as another.

Sorry for the long winded question