I'm trying to split audio for a 2 hour blind lets play

[Koopa Rs07]

Well, personally I record gameplay video & audio separately using ShadowPlay, then webcam &| microphone using some other utility (like Debut). Having them as a merged audio track is really difficult to work with. For the future you might wanna consider doing something similar so you won't have to split them. Splitting them is only an estimate anyway, and is prone to errors.

Thanks man, I'll consider trying that. For now I'm just going to replay the game recording 15 minutes each video. (So if something goes wrong I don't lose hours worth of gameplay).