My pre-configuration v4l2-ctl commands are:

v4l2-ctl -d 0 -c roi_x=0,roi_y=0,preferred_stride=3136,frame_rate=22
v4l2-ctl -d 0 -v width=3088,height=2064,pixelformat=GREY

Format Video Capture:
        Width/Height      : 3088/2064
        Pixel Format      : 'GREY' (8-bit Greyscale)
        Field             : None
        Bytes per Line    : 3136
        Size Image        : 6472704
        Colorspace        : sRGB
        Transfer Function : Default (maps to sRGB)
        YCbCr/HSV Encoding: Default (maps to ITU-R 601)
        Quantization      : Default (maps to Full Range)
        Flags

In my Python script I use GStreamer and the simplified code looks like this:

import cv2

pipeline = f"v4l2src device=/dev/video0 ! appsink"
cap = cv2.VideoCapture(pipeline, cv2.CAP_GSTREAMER)

while True:
    ret, frame = cap.read()
    if not ret:
        print("Capture error")
        break
    cv2.imshow("Cam", frame)
    if cv2.waitKey(45) & 0xFF == ord("q"):
        break

cap.release()
cv2.destroyAllWindows()

It works fine!

Then I try to switch capture API from GStreamer to v4l2:

import cv2

cap = cv2.VideoCapture(0, cv2.CAP_V4L2)

cap.set(cv2.CAP_PROP_FRAME_WIDTH, 3088)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 2064)
cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc(*'GREY'))

while True:
    ret, frame = cap.read()
    if not ret:
        print("Capture error")
        break
    cv2.imshow("Cam", frame)
    if cv2.waitKey(45) & 0xFF == ord("q"):
        break

cap.release()
cv2.destroyAllWindows()

And I see stripes in the video window. I guess the reason is how the v4l2 considers the frame width and the prefered stride.

I try to set:

cap.set(cv2.CAP_PROP_FRAME_WIDTH, 3136)

...and get 'Capture error'.

My attempts to change prefered_stride property by v4l2-ctl were not successful.

The only workaround I've managed to find so far is to reduce the width of the captured frame to a multiple of 64 so that matches the prefered_stride. The closest such value to 3088 is 3072. So I preconfigure the cam with width=3072,prefered_stride=3072. And set in my Python program:

cap.set(cv2.CAP_PROP_FRAME_WIDTH, 3072)

That works fine!

But what if I had to read all 3088 pixels of width? Is there any solution for v4l2 (not GStreamer)?