Noise between bellhousing and Engine

Sounds to me like a broken exhaust valve spring or related echoing through the exhaust pipe. But the speed points more toward a crank issue do to the crank spinning twice to the cam once. Hard to determine listening to the video. The starter isn't staying engaged is it?
It sort of sounds more like a rattle then a metallic hit.
I don't think the starter is staying engaged. The noise I'm hearing here at idle I'm thinking may be related to the ticking I hear when the rpms are help under 2k. Hard to say though. I'm gonna just have to drop the pan and see what story that tells. While I'm at it I can check the flexate/trans area. Damn this makes me mad. The fact it seems worse when it's warm makes me think maybe even bearing related. Idk. Frustrating to say the least