More searching on the internet leads to the following conclusion. Changing aspect ratio - the reality seems to be "you cannot do that". You either need to crop or distort. Instead I "think" you will have to add borders to two of the sides.

On Sun, Mar 3, 2024 at 6:40 AM Rob Prowel via Cin <cin@lists.cinelerra-gg.org> wrote:

I have 3:2 content that is saved in a 4:3 frame with black bands at the
top and bottom.

I want to remove the banding such that the output is a 3:2 resolution
clip WITHOUT DISTORTING THE ORIGINAL CONTENT.

I've tried playing with the crop filter but the black bands remain, and
the camera automation can remove the banding by zooming in, but then the
left and right image sides get cropped out of the output.

Is there a tutorial for this exact scenario?

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