Use only one instance of FFPMEG per SRT stream instead of one per additional cast

stream/multicast/muticast.go

@@ -13,8 +13,8 @@ type Options struct {
 
 var (
 	options            Options
-	ffmpegInstances    = make(map[string][]*exec.Cmd)
+	ffmpegInstances    = make(map[string]*exec.Cmd)
-	ffmpegInputStreams = make(map[string][]*io.WriteCloser)
+	ffmpegInputStreams = make(map[string]*io.WriteCloser)
 )
 
 // New Load configuration
@@ -25,16 +25,19 @@ func New(cfg *Options) error {
 
 // RegisterStream Declare a new open stream and create ffmpeg instances
 func RegisterStream(streamKey string) {
-	ffmpegInstances[streamKey] = []*exec.Cmd{}
+	if len(options.Outputs[streamKey]) == 0 {
-	ffmpegInputStreams[streamKey] = []*io.WriteCloser{}
+		return
+	}
 
-	// TODO Export the list of multicasts
+	params := []string{"-re", "-i", "pipe:0"}
 	for _, stream := range options.Outputs[streamKey] {
-		// Launch FFMPEG instance
 		// TODO Set optimal parameters
-		ffmpeg := exec.Command("ffmpeg", "-re", "-i", "pipe:0", "-f", "flv", "-c:v", "libx264", "-preset",
+		params = append(params, "-f", "flv", "-c:v", "libx264", "-preset",
 			"veryfast", "-maxrate", "3000k", "-bufsize", "6000k", "-pix_fmt", "yuv420p", "-g", "50", "-c:a", "aac",
 			"-b:a", "160k", "-ac", "2", "-ar", "44100", stream)
+	}
+	// Launch FFMPEG instance
+	ffmpeg := exec.Command("ffmpeg", params...)
 
 	// Open pipes
 	input, err := ffmpeg.StdinPipe()
@@ -49,8 +52,8 @@ func RegisterStream(streamKey string) {
 	if err != nil {
 		panic(err)
 	}
-		ffmpegInstances[streamKey] = append(ffmpegInstances[streamKey], ffmpeg)
+	ffmpegInstances[streamKey] = ffmpeg
-		ffmpegInputStreams[streamKey] = append(ffmpegInputStreams[streamKey], &input)
+	ffmpegInputStreams[streamKey] = &input
 
 	if err := ffmpeg.Start(); err != nil {
 		panic(err)
@@ -70,27 +73,23 @@ func RegisterStream(streamKey string) {
 			log.Println("[FFMPEG ERROR " + streamKey + "] " + scanner.Text())
 		}
 	}()
-	}
 }
 
 // SendPacket When a SRT packet is received, transmit it to all FFMPEG instances related to the stream key
 func SendPacket(streamKey string, data []byte) {
-	for _, stdin := range ffmpegInputStreams[streamKey] {
+	stdin := ffmpegInputStreams[streamKey]
 	_, err := (*stdin).Write(data)
 	if err != nil {
 		log.Println("Error while sending a packet to external streaming server for key "+streamKey, err)
 	}
-	}
-
 }
 
 // CloseConnection When the stream is ended, close FFMPEG instances
 func CloseConnection(streamKey string) {
-	for _, ffmpeg := range ffmpegInstances[streamKey] {
+	ffmpeg := ffmpegInstances[streamKey]
 	if err := ffmpeg.Process.Kill(); err != nil {
 		panic(err)
 	}
-	}
 	delete(ffmpegInstances, streamKey)
 	delete(ffmpegInputStreams, streamKey)
 }