Is it possible to have a video 100% opaque over a larger one in the background?

Yes, see attached.  I am not sure what the problem is but maybe another user will have an idea of what might be going wrong.
Meanwhile, I will see if I can duplicate your scenario.

On Mon, May 24, 2021 at 9:37 PM Phyllis Smith via Cin <cin@lists.cinelerra-gg.org> wrote:

Is it possible to have a video 100% opaque over a larger one in the background?

Yes, see attached.  I am not sure what the problem is but maybe another user will have an idea of what might be going wrong.
Meanwhile, I will see if I can duplicate your scenario.
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Hello Phyllis,

Thank you for your assistance.  Yes this is exactly what I'm looking to do.

I've been doing a lot of googling, and old post mentioned to try fiddling with the camerra/projector along with crop feature.

I am able to achieve my goal that way, but it is quite time consuming and error prone.

It certainly would be nice if a video is cropped, and I select normal (or whichever mode) from patchbay overlay selector and it "just work"