Fix audio.microphone

audio/ffmpeg.go

@@ -37,7 +37,7 @@ func NewMicrophone() (*microphone, error) {
 func (m *microphone) Start() error {
 	m.command = exec.Command("ffmpeg", "-re",
 		"-f", m.Format,
-		"-i", m.Device,
+		"-i", fmt.Sprintf(":%s", m.Device),
 		"-f", m.Encoding.Codec,
 		"-ar", fmt.Sprintf("%d", m.Encoding.Bitrate),
 		"-ac", fmt.Sprintf("%d", m.Encoding.Channels),

main.go

@@ -53,5 +53,5 @@ func micStreamExample() {
 }
 
 func main() {
-	pulsectlExample()
+	micStreamExample()
 }