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set v4l2 framerate
bool set_framerate(int fd)
struct v4l2_streamparm parm;
parm.parm.capture.timeperframe.numerator = 15;
parm.parm.capture.timeperframe.denominator = 1;
int ret = xioctl(fd, VIDIOC_S_PARM, &parm);
if (ret < 0)
return false;
return true;

The values in numerator and denominator should be flipped. This will always result in 1fps, rather than the intended 15fps.

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