camera resolution and movie size

[solsticedhiver]

So I am trying to use motion on a rpi0 raspios trixie 32 bit (lite). with motion 5 compiled from source (git 10bb267).

And if I specify a width and height in the config file like 640x480 with libcam_device camera0, the image/movie is just a little tiny portion of what the sensor is capable of viewing.

If I set the width and height to max sensor capabilty, well obviously the rpi0 is not able to cope with such a high res, not even encode a movie from it...

How do I do to use the full size of sensor, but reduce the size of image or movie resolution somehow? Or Do so that image returned by the camera is a resized version of the full sensor image?

It was possible to do it in the past with old cam stack. I don't knwo what was involded and how it worked though

[JChristensen]

Recently RPiOS updated the kernel from 6.12 to 6.18. After this update, my cameras (Zero 2Ws with trixie 64-bit lite) show a zoomed-in view that looks to be 1/4 of the image area I previously saw. Wondering if this is the same issue, or if anyone else has noticed it.

PS: Rebuilding from source using the current repo (commit 10bb267) made no difference. Previously I had built from source, commit dbc88e9 04Jan2026.
PPS: Looking back at the dpkg log, I see that libcamera was also updated, so that may be the culprit rather than the kernel.
PPPS: Images taken with rpicam-still or rpicam-jpeg have the expected field of view.
PPPPS: Maybe not libcamera.