diff --git a/cmd/ffmpeg/ffmpeg.go b/cmd/ffmpeg/ffmpeg.go
index cbd795ec..1e61122f 100644
--- a/cmd/ffmpeg/ffmpeg.go
+++ b/cmd/ffmpeg/ffmpeg.go
@@ -51,7 +51,7 @@ var defaults = map[string]string{
 	"rtsp/udp": "-fflags nobuffer -flags low_delay -timeout 5000000 -user_agent go2rtc/ffmpeg -i {input}",
 
 	// output
-	"output": "-user_agent ffmpeg/go2rtc -rtsp_transport tcp -f rtsp {output}",
+	"output": "-user_agent ffmpeg/go2rtc -rtsp_transport tcp -bufsize 8192k -f rtsp {output}",
 
 	// `-preset superfast` - we can't use ultrafast because it doesn't support `-profile main -level 4.1`
 	// `-tune zerolatency` - for minimal latency
diff --git a/cmd/mp4/mp4.go b/cmd/mp4/mp4.go
index 06f4fe8d..6f3fa1f7 100644
--- a/cmd/mp4/mp4.go
+++ b/cmd/mp4/mp4.go
@@ -46,12 +46,15 @@ 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
 		}
 	})
@@ -105,7 +108,7 @@ 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),
@@ -119,7 +122,10 @@ func handlerMP4(w http.ResponseWriter, r *http.Request) {
 			mu.Lock()
 			defer mu.Unlock()
 			if _, err := w.Write(data); err != nil && exit != nil {
-				exit <- err
+				select {
+				case exit <- err:
+				default:
+				}
 				exit = nil
 			}
 		}
diff --git a/cmd/rtsp/rtsp.go b/cmd/rtsp/rtsp.go
index f5d54440..31ab985b 100644
--- a/cmd/rtsp/rtsp.go
+++ b/cmd/rtsp/rtsp.go
@@ -1,6 +1,7 @@
 package rtsp
 
 import (
+	"io"
 	"net"
 	"net/url"
 	"strings"
@@ -213,7 +214,9 @@ func tcpHandler(conn *rtsp.Conn) {
 	})
 
 	if err := conn.Accept(); err != nil {
-		log.Warn().Err(err).Caller().Send()
+		if err != io.EOF {
+			log.Warn().Err(err).Caller().Send()
+		}
 		if closer != nil {
 			closer()
 		}
diff --git a/pkg/core/track.go b/pkg/core/track.go
index 82c8cc8a..ade3ca8d 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++
 		}
 	}
@@ -42,11 +42,11 @@ func (t *Receiver) WriteRTP(packet *rtp.Packet) {
 }
 
 func (t *Receiver) Senders() (senders []*Sender) {
-	t.mu.Lock()
+	t.mu.RLock()
 	for sender := range t.senders {
 		senders = append(senders, sender)
 	}
-	t.mu.Unlock()
+	t.mu.RUnlock()
 	return
 }
 
@@ -73,12 +73,9 @@ func (t *Receiver) Replace(target *Receiver) {
 
 func (t *Receiver) String() string {
 	s := t.Codec.String() + ", bytes=" + strconv.Itoa(t.bytes)
-	if t.mu.TryLock() {
-		s += fmt.Sprintf(", senders=%d", len(t.senders))
-		t.mu.Unlock()
-	} else {
-		s += fmt.Sprintf(", senders=?")
-	}
+	t.mu.RLock()
+	s += fmt.Sprintf(", senders=%d", len(t.senders))
+	t.mu.RUnlock()
 	return s
 }
 
@@ -93,7 +90,7 @@ type Sender struct {
 	Handler HandlerFunc
 
 	receivers []*Receiver
-	mu        sync.Mutex
+	mu        sync.RWMutex
 	bytes     int
 
 	overflow int
@@ -127,7 +124,6 @@ func (s *Sender) HandleRTP(track *Receiver) {
 	}
 	track.senders[s] = buffer
 	track.mu.Unlock()
-
 	s.mu.Lock()
 	s.receivers = append(s.receivers, track)
 	s.mu.Unlock()
@@ -135,7 +131,9 @@ 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)
 		}
 
@@ -171,12 +169,9 @@ func (s *Sender) Close() {
 
 func (s *Sender) String() string {
 	info := s.Codec.String() + ", bytes=" + strconv.Itoa(s.bytes)
-	if s.mu.TryLock() {
-		info += ", receivers=" + strconv.Itoa(len(s.receivers))
-		s.mu.Unlock()
-	} else {
-		info += ", receivers=?"
-	}
+	s.mu.RLock()
+	info += ", receivers=" + strconv.Itoa(len(s.receivers))
+	s.mu.RUnlock()
 	if s.overflow > 0 {
 		info += ", overflow=" + strconv.Itoa(s.overflow)
 	}