Rendering Black

I’m not sure what section to put this in as I have no idea where the problem is originating. This is the most general sounding topic so I put it here, but feel free to move it if you think it is misplaced.

Basically everything works perfectly in my animation, up to when it renders. The details are hard to explain so here is a video of the problem:

Still frames render dark as well, and nothing I do seems to make a difference. Any ideas?

What is on in your compositor Node Window? Do you have the Render layer node hooked to your composite output? Do you have your Compositor turned off in the Render properties tabs?