diff --git a/input/gvctrl/gvctrl.go b/input/gvctrl/gvctrl.go
index 21b6e583..49065d82 100644
--- a/input/gvctrl/gvctrl.go
+++ b/input/gvctrl/gvctrl.go
@@ -190,6 +190,7 @@ func Quality(q quality) option {
 	}
 }
 
+// TODO: add check of r
 func BitRate(r int) option {
 	return func(s settings) error {
 		var (
@@ -200,17 +201,17 @@ func BitRate(r int) option {
 		)
 
 		if s.vbr == "1" {
-			s.bitRate = convRate(r, vbrRates)
+			s.bitRate = closestValStr(r, vbrRates)
 			return nil
 		}
 
 		switch s.res {
 		case "12800720":
-			s.bitRate = convRate(r, cbrRates720)
+			s.bitRate = closestValStr(r, cbrRates720)
 		case "6400360":
-			s.bitRate = convRate(r, cbrRates360)
+			s.bitRate = closestValStr(r, cbrRates360)
 		case "4480256":
-			s.bitRate = convRate(r, cbrRates256)
+			s.bitRate = closestValStr(r, cbrRates256)
 		default:
 			panic("bad resolution")
 		}
@@ -218,8 +219,19 @@ func BitRate(r int) option {
 	}
 }
 
-func Refresh(r int) option {
-	return func(settings) error {
+func Refresh(r float64) option {
+	return func(s settings) error {
+		const (
+			maxRefreshPeriod = 5
+			minRefreshPeriod = .25
+		)
+
+		if minRefreshPeriod > r || r > maxRefreshPeriod {
+			return fmt.Errorf("invalid refresh period: %g", r)
+		}
+
+		refOptions := []int{250, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000}
+		s.refresh = closestValStr(int(r*1000), refOptions)
 		return nil
 	}
 }
diff --git a/input/gvctrl/utils.go b/input/gvctrl/utils.go
index 21986341..ddd4a838 100644
--- a/input/gvctrl/utils.go
+++ b/input/gvctrl/utils.go
@@ -49,6 +49,6 @@ func closestValIdx(v int, l []int) int {
 	return idx
 }
 
-func convRate(v int, l []int) string {
+func closestValStr(v int, l []int) string {
 	return strconv.Itoa(l[closestValIdx(v, l)] * 1000)
 }