IOCTL call on VIDIOC_ENUM_FRAMEINTERVALS fails to enumarate frame interval/rate for FFmpeg V4L2 cameras

When using a camera module ( tested with a Pi Camera Module v3) on a Raspberry Pi 4, the method doCheckCameras from the QV4L2CameraDevices object fails to add the camera to the camera list.

This mainly happens because the IOCTL system call xioctl(fd, VIDIOC_ENUM_FRAMEINTERVALS, &frameInterval) always return an EINVAL, therefore min and max frame rates are not configured and subsequently the camera videoFormats/photoResolution remains empty .
In attachment is a minimal code to reproduce this issue (ioctl_frame_interval.cpp)

Although previous bug fix https://bugreports.qt.io/browse/QTBUG-123526 added support for stepwise frame sizes by adding the minimum and maximum supported frame size to a resolution list. This does not seem to solve the problem because of the failing ioctl call.

According to a suggestion from a RPi foundation Engineer on a similar issue,  configuring frame interval/rate can be achieved by considering V4L2_CID_HBLANK/V4L2_CID_VBLANK.
https://forums.raspberrypi.com/viewtopic.php?t=363974

I also tried supporting  frame sizes between the max and min by incrementing step sizes for resp. width and height (see attachment ioctl_stepwise_frame_size_nested_for.c). However this can take forever specially if the step is set to 1.