libavdevice/v4l2.c:527: error: Uninitialized Value
  The value read from fps.num was never initialized.

libavdevice/v4l2.c:527:9: 
525.                fps.den, fps.num);
526.         tpf->numerator   = fps.den;
527.         tpf->denominator = fps.num;
             ^
528.         if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
529.             av_log(s1, AV_LOG_ERROR,
