VIDIOC_REQBUFS only returns 2

[hatemmahmoudi]

I am encoutring an issue while attempting to request buffer I only got 2

  struct v4l2_requestbuffers breq = { 0 };
  breq.count = 32;
  breq.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  breq.memory = V4L2_MEMORY_MMAP;

 ioctl(mock_v4l2_fd, VIDIOC_REQBUFS, &breq)

Is a driver limititation ?

[stephematician]

The default maximum number of buffers for a device is 2. When the device is created use max_buffers=32 to allow for up to 32 buffers; e.g.

sudo modprobe v4l2loopback max_buffers=32