diff --git a/cmd/mp4/mp4.go b/cmd/mp4/mp4.go
index a8a6b292..e569f869 100644
--- a/cmd/mp4/mp4.go
+++ b/cmd/mp4/mp4.go
@@ -44,12 +44,15 @@ func handlerKeyframe(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	exit := make(chan []byte)
+	exit := make(chan []byte, 1)
 
 	cons := &mp4.Segment{OnlyKeyframe: true}
 	cons.Listen(func(msg any) {
 		if data, ok := msg.([]byte); ok && exit != nil {
-			exit <- data
+			select {
+			case exit <- data:
+			default:
+			}
 			exit = nil
 		}
 	})
@@ -103,7 +106,7 @@ func handlerMP4(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	exit := make(chan error)
+	exit := make(chan error, 1) // Add buffer to prevent blocking
 
 	cons := &mp4.Consumer{
 		RemoteAddr: tcp.RemoteAddr(r),
@@ -114,7 +117,10 @@ func handlerMP4(w http.ResponseWriter, r *http.Request) {
 	cons.Listen(func(msg any) {
 		if data, ok := msg.([]byte); ok {
 			if _, err := w.Write(data); err != nil && exit != nil {
-				exit <- err
+				select {
+				case exit <- err:
+				default:
+				}
 				exit = nil
 			}
 		}
diff --git a/pkg/core/track.go b/pkg/core/track.go
index 82c8cc8a..891b2527 100644
--- a/pkg/core/track.go
+++ b/pkg/core/track.go
@@ -18,7 +18,7 @@ type Receiver struct {
 	ID byte // Channel for RTSP, PayloadType for MPEG-TS
 
 	senders map[*Sender]chan *rtp.Packet
-	mu      sync.Mutex
+	mu      sync.RWMutex
 	bytes   int
 }
 
@@ -32,9 +32,9 @@ func (t *Receiver) WriteRTP(packet *rtp.Packet) {
 	t.mu.Lock()
 	t.bytes += len(packet.Payload)
 	for sender, buffer := range t.senders {
-		if len(buffer) < cap(buffer) {
-			buffer <- packet
-		} else {
+		select {
+		case buffer <- packet:
+		default:
 			sender.overflow++
 		}
 	}
@@ -93,7 +93,7 @@ type Sender struct {
 	Handler HandlerFunc
 
 	receivers []*Receiver
-	mu        sync.Mutex
+	mu        sync.RWMutex
 	bytes     int
 
 	overflow int
@@ -135,7 +135,9 @@ func (s *Sender) HandleRTP(track *Receiver) {
 	go func() {
 		// read packets from buffer channel until it will be closed
 		for packet := range buffer {
+			s.mu.Lock()
 			s.bytes += len(packet.Payload)
+			s.mu.Unlock()
 			s.Handler(packet)
 		}