diff --git a/soundwave/service.go b/soundwave/service.go
index 2196f9d..4ef3464 100644
--- a/soundwave/service.go
+++ b/soundwave/service.go
@@ -35,7 +35,7 @@ func (s *service) GenerateWaveForm() string {
 	if err != nil {
 		panic(fmt.Sprintf("could not get video duration: %v", err))
 	}*/
-	outputPath := path.Join(path.Dir(s.flags.Output), "output.png") 
+	outputPath := path.Join(path.Dir(s.flags.Output), s.flags.Output) 
 	log.Println(outputPath)
 	//ffmpeg -i input -filter_complex "compand,showwavespic=s=640x120" -frames:v 1 output.png
 	cmd := exec.Command(
diff --git a/types/flags.go b/types/flags.go
index c219ba9..cbeb8b6 100644
--- a/types/flags.go
+++ b/types/flags.go
@@ -16,7 +16,7 @@ type Flags struct {
 func (f *Flags) Set() error {
 	//
 	input := flag.String("i", "", "path of the input file")
-	output := flag.String("o", "", "path of the output soundwave file")
+	output := flag.String("o", "output.png", "path of the output soundwave file")
 	width := flag.Int("w", 640, "frame width")
 	height := flag.Int("h", 120, "frame height")
 	//