VIDIOC_REQBUFS only returns 2 #560

hatemmahmoudi · 2023-10-20T13:39:32Z

hatemmahmoudi
Oct 20, 2023

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 · 2024-11-12T02:00:48Z

stephematician
Nov 12, 2024

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

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VIDIOC_REQBUFS only returns 2 #560

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hatemmahmoudi Oct 20, 2023

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stephematician Nov 12, 2024

hatemmahmoudi
Oct 20, 2023

stephematician
Nov 12, 2024