set v4l2 framerate

framerate.c

bool set_framerate(int fd)

    struct v4l2_streamparm parm;

    parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

    // 1/15 seconds per frame. Or 15 frames/second 
    parm.parm.capture.timeperframe.numerator = 1;
    parm.parm.capture.timeperframe.denominator = 15;

    int ret = xioctl(fd, VIDIOC_S_PARM, &parm);

    if (ret < 0)
    {
        return false;
    }

    return true;
}