code: func kvImageInfo(v []byte) (ii camtypes.ImageInfo, ok bool) {
  	pipei := bytes.IndexByte(v, '|')
  	if pipei < 0 {
  		return
  	}
  	w, err := strutil.ParseUintBytes(v[:pipei], 10, 16)
  	if err != nil {
  		return
  	}
  	h, err := strutil.ParseUintBytes(v[pipei+1:], 10, 16)
  	if err != nil {
  		return
  	}
  	ii.Width = uint16(w)
  	ii.Height = uint16(h)
  	return ii, true
  }
docs: // v is "width|height"