[Cin] cannot seem to get an overlay to be 100% opaque

[nospam me]

Thank you for your hard work on Cin.

I'm using the latest official release of Cin for Ubuntu.

My issue:
-------------
No matter what I try, when placing a video cropped and laid over top of
another video always has some degree of transparency.  I simply want 100 %
opaque overlay of a smaller video on top of a larger one in the background.

My two video files are h264 from nvidia nvenc in OBS, 2560x1440.  They're
both the same physical dimensions originally, but I want to crop one of
them down and overlay it on top of the other.  But it always has some form
of transparency.


What I've tried:
--------------------
I've used the internal crop filters to reduce something.  No luck.

I've used Avidemux to crop the video and import it as a new clip. No luck.

I've tried each and every overly method in the patchbay. No luck.

I'm out of ideas.

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

I've even tried to follow this video, and the f_colorkey filter does not
work like that video shows.
https://www.youtube.com/watch?v=-VpfNBtFqyY&list=PLCI9oI4dS9zxOX_gxl7JlyiIFpf-sC3uF&index=11

Thank you for your help on this matter.
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