diff --git a/internal/protocols/rtmp/chunk/chunk.go b/internal/protocols/rtmp/chunk/chunk.go
index 25e992a5..51833ca0 100644
--- a/internal/protocols/rtmp/chunk/chunk.go
+++ b/internal/protocols/rtmp/chunk/chunk.go
@@ -7,6 +7,6 @@ import (
 
 // Chunk is a chunk.
 type Chunk interface {
-	Read(io.Reader, uint32) error
-	Marshal() ([]byte, error)
+	Read(r io.Reader, bodyLen uint32, hasExtendedTimestamp bool) error
+	Marshal(hasExtendedTimestamp bool) ([]byte, error)
 }
diff --git a/internal/protocols/rtmp/chunk/chunk0.go b/internal/protocols/rtmp/chunk/chunk0.go
index 7bb76d09..f0e0323d 100644
--- a/internal/protocols/rtmp/chunk/chunk0.go
+++ b/internal/protocols/rtmp/chunk/chunk0.go
@@ -11,14 +11,14 @@ import (
 type Chunk0 struct {
 	ChunkStreamID   byte
 	Timestamp       uint32
+	BodyLen         uint32
 	Type            uint8
 	MessageStreamID uint32
-	BodyLen         uint32
 	Body            []byte
 }
 
 // Read reads the chunk.
-func (c *Chunk0) Read(r io.Reader, chunkMaxBodyLen uint32) error {
+func (c *Chunk0) Read(r io.Reader, maxBodyLen uint32, _ bool) error {
 	header := make([]byte, 12)
 	_, err := io.ReadFull(r, header)
 	if err != nil {
@@ -31,9 +31,18 @@ func (c *Chunk0) Read(r io.Reader, chunkMaxBodyLen uint32) error {
 	c.Type = header[7]
 	c.MessageStreamID = uint32(header[8])<<24 | uint32(header[9])<<16 | uint32(header[10])<<8 | uint32(header[11])
 
+	if c.Timestamp >= 0xFFFFFF {
+		_, err := io.ReadFull(r, header[:4])
+		if err != nil {
+			return err
+		}
+
+		c.Timestamp = uint32(header[0])<<24 | uint32(header[1])<<16 | uint32(header[2])<<8 | uint32(header[3])
+	}
+
 	chunkBodyLen := c.BodyLen
-	if chunkBodyLen > chunkMaxBodyLen {
-		chunkBodyLen = chunkMaxBodyLen
+	if chunkBodyLen > maxBodyLen {
+		chunkBodyLen = maxBodyLen
 	}
 
 	c.Body = make([]byte, chunkBodyLen)
@@ -41,21 +50,50 @@ func (c *Chunk0) Read(r io.Reader, chunkMaxBodyLen uint32) error {
 	return err
 }
 
+func (c Chunk0) marshalSize() int {
+	n := 12 + len(c.Body)
+	if c.Timestamp >= 0xFFFFFF {
+		n += 4
+	}
+	return n
+}
+
 // Marshal writes the chunk.
-func (c Chunk0) Marshal() ([]byte, error) {
-	buf := make([]byte, 12+len(c.Body))
+func (c Chunk0) Marshal(_ bool) ([]byte, error) {
+	buf := make([]byte, c.marshalSize())
 	buf[0] = c.ChunkStreamID
-	buf[1] = byte(c.Timestamp >> 16)
-	buf[2] = byte(c.Timestamp >> 8)
-	buf[3] = byte(c.Timestamp)
-	buf[4] = byte(c.BodyLen >> 16)
-	buf[5] = byte(c.BodyLen >> 8)
-	buf[6] = byte(c.BodyLen)
-	buf[7] = c.Type
-	buf[8] = byte(c.MessageStreamID >> 24)
-	buf[9] = byte(c.MessageStreamID >> 16)
-	buf[10] = byte(c.MessageStreamID >> 8)
-	buf[11] = byte(c.MessageStreamID)
-	copy(buf[12:], c.Body)
+
+	if c.Timestamp >= 0xFFFFFF {
+		buf[1] = 0xFF
+		buf[2] = 0xFF
+		buf[3] = 0xFF
+		buf[4] = byte(c.BodyLen >> 16)
+		buf[5] = byte(c.BodyLen >> 8)
+		buf[6] = byte(c.BodyLen)
+		buf[7] = c.Type
+		buf[8] = byte(c.MessageStreamID >> 24)
+		buf[9] = byte(c.MessageStreamID >> 16)
+		buf[10] = byte(c.MessageStreamID >> 8)
+		buf[11] = byte(c.MessageStreamID)
+		buf[12] = byte(c.Timestamp >> 24)
+		buf[13] = byte(c.Timestamp >> 16)
+		buf[14] = byte(c.Timestamp >> 8)
+		buf[15] = byte(c.Timestamp)
+		copy(buf[16:], c.Body)
+	} else {
+		buf[1] = byte(c.Timestamp >> 16)
+		buf[2] = byte(c.Timestamp >> 8)
+		buf[3] = byte(c.Timestamp)
+		buf[4] = byte(c.BodyLen >> 16)
+		buf[5] = byte(c.BodyLen >> 8)
+		buf[6] = byte(c.BodyLen)
+		buf[7] = c.Type
+		buf[8] = byte(c.MessageStreamID >> 24)
+		buf[9] = byte(c.MessageStreamID >> 16)
+		buf[10] = byte(c.MessageStreamID >> 8)
+		buf[11] = byte(c.MessageStreamID)
+		copy(buf[12:], c.Body)
+	}
+
 	return buf, nil
 }
diff --git a/internal/protocols/rtmp/chunk/chunk0_test.go b/internal/protocols/rtmp/chunk/chunk0_test.go
deleted file mode 100644
index 48105584..00000000
--- a/internal/protocols/rtmp/chunk/chunk0_test.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package chunk
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-var chunk0enc = []byte{
-	0x19, 0xb1, 0xa1, 0x91, 0x0, 0x0, 0x14, 0x14,
-	0x3, 0x5d, 0x17, 0x3d, 0x1, 0x2, 0x3, 0x4,
-}
-
-var chunk0dec = Chunk0{
-	ChunkStreamID:   25,
-	Timestamp:       11641233,
-	Type:            20,
-	MessageStreamID: 56432445,
-	BodyLen:         20,
-	Body:            []byte{0x01, 0x02, 0x03, 0x04},
-}
-
-func TestChunk0Read(t *testing.T) {
-	var chunk0 Chunk0
-	err := chunk0.Read(bytes.NewReader(chunk0enc), 4)
-	require.NoError(t, err)
-	require.Equal(t, chunk0dec, chunk0)
-}
-
-func TestChunk0Marshal(t *testing.T) {
-	buf, err := chunk0dec.Marshal()
-	require.NoError(t, err)
-	require.Equal(t, chunk0enc, buf)
-}
diff --git a/internal/protocols/rtmp/chunk/chunk1.go b/internal/protocols/rtmp/chunk/chunk1.go
index 3c2ed0bd..28f3e5b4 100644
--- a/internal/protocols/rtmp/chunk/chunk1.go
+++ b/internal/protocols/rtmp/chunk/chunk1.go
@@ -13,13 +13,13 @@ import (
 type Chunk1 struct {
 	ChunkStreamID  byte
 	TimestampDelta uint32
-	Type           uint8
 	BodyLen        uint32
+	Type           uint8
 	Body           []byte
 }
 
 // Read reads the chunk.
-func (c *Chunk1) Read(r io.Reader, chunkMaxBodyLen uint32) error {
+func (c *Chunk1) Read(r io.Reader, maxBodyLen uint32, _ bool) error {
 	header := make([]byte, 8)
 	_, err := io.ReadFull(r, header)
 	if err != nil {
@@ -31,9 +31,18 @@ func (c *Chunk1) Read(r io.Reader, chunkMaxBodyLen uint32) error {
 	c.BodyLen = uint32(header[4])<<16 | uint32(header[5])<<8 | uint32(header[6])
 	c.Type = header[7]
 
+	if c.TimestampDelta >= 0xFFFFFF {
+		_, err = io.ReadFull(r, header[:4])
+		if err != nil {
+			return err
+		}
+
+		c.TimestampDelta = uint32(header[0])<<24 | uint32(header[1])<<16 | uint32(header[2])<<8 | uint32(header[3])
+	}
+
 	chunkBodyLen := (c.BodyLen)
-	if chunkBodyLen > chunkMaxBodyLen {
-		chunkBodyLen = chunkMaxBodyLen
+	if chunkBodyLen > maxBodyLen {
+		chunkBodyLen = maxBodyLen
 	}
 
 	c.Body = make([]byte, chunkBodyLen)
@@ -41,17 +50,42 @@ func (c *Chunk1) Read(r io.Reader, chunkMaxBodyLen uint32) error {
 	return err
 }
 
+func (c Chunk1) marshalSize() int {
+	n := 8 + len(c.Body)
+	if c.TimestampDelta >= 0xFFFFFF {
+		n += 4
+	}
+	return n
+}
+
 // Marshal writes the chunk.
-func (c Chunk1) Marshal() ([]byte, error) {
-	buf := make([]byte, 8+len(c.Body))
+func (c Chunk1) Marshal(_ bool) ([]byte, error) {
+	buf := make([]byte, c.marshalSize())
 	buf[0] = 1<<6 | c.ChunkStreamID
-	buf[1] = byte(c.TimestampDelta >> 16)
-	buf[2] = byte(c.TimestampDelta >> 8)
-	buf[3] = byte(c.TimestampDelta)
-	buf[4] = byte(c.BodyLen >> 16)
-	buf[5] = byte(c.BodyLen >> 8)
-	buf[6] = byte(c.BodyLen)
-	buf[7] = c.Type
-	copy(buf[8:], c.Body)
+
+	if c.TimestampDelta >= 0xFFFFFF {
+		buf[1] = 0xFF
+		buf[2] = 0xFF
+		buf[3] = 0xFF
+		buf[4] = byte(c.BodyLen >> 16)
+		buf[5] = byte(c.BodyLen >> 8)
+		buf[6] = byte(c.BodyLen)
+		buf[7] = c.Type
+		buf[8] = byte(c.TimestampDelta >> 24)
+		buf[9] = byte(c.TimestampDelta >> 16)
+		buf[10] = byte(c.TimestampDelta >> 8)
+		buf[11] = byte(c.TimestampDelta)
+		copy(buf[12:], c.Body)
+	} else {
+		buf[1] = byte(c.TimestampDelta >> 16)
+		buf[2] = byte(c.TimestampDelta >> 8)
+		buf[3] = byte(c.TimestampDelta)
+		buf[4] = byte(c.BodyLen >> 16)
+		buf[5] = byte(c.BodyLen >> 8)
+		buf[6] = byte(c.BodyLen)
+		buf[7] = c.Type
+		copy(buf[8:], c.Body)
+	}
+
 	return buf, nil
 }
diff --git a/internal/protocols/rtmp/chunk/chunk1_test.go b/internal/protocols/rtmp/chunk/chunk1_test.go
deleted file mode 100644
index 3d6cf33c..00000000
--- a/internal/protocols/rtmp/chunk/chunk1_test.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package chunk
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-var chunk1enc = []byte{
-	0x59, 0xb1, 0xa1, 0x91, 0x0, 0x0, 0x14, 0x14,
-	0x1, 0x2, 0x3, 0x4,
-}
-
-var chunk1dec = Chunk1{
-	ChunkStreamID:  25,
-	TimestampDelta: 11641233,
-	Type:           20,
-	BodyLen:        20,
-	Body:           []byte{0x01, 0x02, 0x03, 0x04},
-}
-
-func TestChunk1Read(t *testing.T) {
-	var chunk1 Chunk1
-	err := chunk1.Read(bytes.NewReader(chunk1enc), 4)
-	require.NoError(t, err)
-	require.Equal(t, chunk1dec, chunk1)
-}
-
-func TestChunk1Marshal(t *testing.T) {
-	buf, err := chunk1dec.Marshal()
-	require.NoError(t, err)
-	require.Equal(t, chunk1enc, buf)
-}
diff --git a/internal/protocols/rtmp/chunk/chunk2.go b/internal/protocols/rtmp/chunk/chunk2.go
index e43a69d4..10d48833 100644
--- a/internal/protocols/rtmp/chunk/chunk2.go
+++ b/internal/protocols/rtmp/chunk/chunk2.go
@@ -15,7 +15,7 @@ type Chunk2 struct {
 }
 
 // Read reads the chunk.
-func (c *Chunk2) Read(r io.Reader, chunkBodyLen uint32) error {
+func (c *Chunk2) Read(r io.Reader, bodyLen uint32, _ bool) error {
 	header := make([]byte, 4)
 	_, err := io.ReadFull(r, header)
 	if err != nil {
@@ -25,18 +25,48 @@ func (c *Chunk2) Read(r io.Reader, chunkBodyLen uint32) error {
 	c.ChunkStreamID = header[0] & 0x3F
 	c.TimestampDelta = uint32(header[1])<<16 | uint32(header[2])<<8 | uint32(header[3])
 
-	c.Body = make([]byte, chunkBodyLen)
+	if c.TimestampDelta >= 0xFFFFFF {
+		_, err = io.ReadFull(r, header[:4])
+		if err != nil {
+			return err
+		}
+
+		c.TimestampDelta = uint32(header[0])<<24 | uint32(header[1])<<16 | uint32(header[2])<<8 | uint32(header[3])
+	}
+
+	c.Body = make([]byte, bodyLen)
 	_, err = io.ReadFull(r, c.Body)
 	return err
 }
 
+func (c Chunk2) marshalSize() int {
+	n := 4 + len(c.Body)
+	if c.TimestampDelta >= 0xFFFFFF {
+		n += 4
+	}
+	return n
+}
+
 // Marshal writes the chunk.
-func (c Chunk2) Marshal() ([]byte, error) {
-	buf := make([]byte, 4+len(c.Body))
+func (c Chunk2) Marshal(_ bool) ([]byte, error) {
+	buf := make([]byte, c.marshalSize())
 	buf[0] = 2<<6 | c.ChunkStreamID
-	buf[1] = byte(c.TimestampDelta >> 16)
-	buf[2] = byte(c.TimestampDelta >> 8)
-	buf[3] = byte(c.TimestampDelta)
-	copy(buf[4:], c.Body)
+
+	if c.TimestampDelta >= 0xFFFFFF {
+		buf[1] = 0xFF
+		buf[2] = 0xFF
+		buf[3] = 0xFF
+		buf[4] = byte(c.TimestampDelta >> 24)
+		buf[5] = byte(c.TimestampDelta >> 16)
+		buf[6] = byte(c.TimestampDelta >> 8)
+		buf[7] = byte(c.TimestampDelta)
+		copy(buf[8:], c.Body)
+	} else {
+		buf[1] = byte(c.TimestampDelta >> 16)
+		buf[2] = byte(c.TimestampDelta >> 8)
+		buf[3] = byte(c.TimestampDelta)
+		copy(buf[4:], c.Body)
+	}
+
 	return buf, nil
 }
diff --git a/internal/protocols/rtmp/chunk/chunk2_test.go b/internal/protocols/rtmp/chunk/chunk2_test.go
deleted file mode 100644
index e5d8defc..00000000
--- a/internal/protocols/rtmp/chunk/chunk2_test.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package chunk
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-var chunk2enc = []byte{
-	0x99, 0xb1, 0xa1, 0x91, 0x1, 0x2, 0x3, 0x4,
-}
-
-var chunk2dec = Chunk2{
-	ChunkStreamID:  25,
-	TimestampDelta: 11641233,
-	Body:           []byte{0x01, 0x02, 0x03, 0x04},
-}
-
-func TestChunk2Read(t *testing.T) {
-	var chunk2 Chunk2
-	err := chunk2.Read(bytes.NewReader(chunk2enc), 4)
-	require.NoError(t, err)
-	require.Equal(t, chunk2dec, chunk2)
-}
-
-func TestChunk2Marshal(t *testing.T) {
-	buf, err := chunk2dec.Marshal()
-	require.NoError(t, err)
-	require.Equal(t, chunk2enc, buf)
-}
diff --git a/internal/protocols/rtmp/chunk/chunk3.go b/internal/protocols/rtmp/chunk/chunk3.go
index e5871bd0..ea953b53 100644
--- a/internal/protocols/rtmp/chunk/chunk3.go
+++ b/internal/protocols/rtmp/chunk/chunk3.go
@@ -16,24 +16,45 @@ type Chunk3 struct {
 }
 
 // Read reads the chunk.
-func (c *Chunk3) Read(r io.Reader, chunkBodyLen uint32) error {
-	header := make([]byte, 1)
-	_, err := io.ReadFull(r, header)
+func (c *Chunk3) Read(r io.Reader, bodyLen uint32, hasExtendedTimestamp bool) error {
+	header := make([]byte, 4)
+	_, err := io.ReadFull(r, header[:1])
 	if err != nil {
 		return err
 	}
 
 	c.ChunkStreamID = header[0] & 0x3F
 
-	c.Body = make([]byte, chunkBodyLen)
+	if hasExtendedTimestamp {
+		_, err := io.ReadFull(r, header[:4])
+		if err != nil {
+			return err
+		}
+	}
+
+	c.Body = make([]byte, bodyLen)
 	_, err = io.ReadFull(r, c.Body)
 	return err
 }
 
+func (c Chunk3) marshalSize(hasExtendedTimestamp bool) int {
+	n := 1 + len(c.Body)
+	if hasExtendedTimestamp {
+		n += 4
+	}
+	return n
+}
+
 // Marshal writes the chunk.
-func (c Chunk3) Marshal() ([]byte, error) {
-	buf := make([]byte, 1+len(c.Body))
+func (c Chunk3) Marshal(hasExtendedTimestamp bool) ([]byte, error) {
+	buf := make([]byte, c.marshalSize(hasExtendedTimestamp))
 	buf[0] = 3<<6 | c.ChunkStreamID
-	copy(buf[1:], c.Body)
+
+	if hasExtendedTimestamp {
+		copy(buf[5:], c.Body)
+	} else {
+		copy(buf[1:], c.Body)
+	}
+
 	return buf, nil
 }
diff --git a/internal/protocols/rtmp/chunk/chunk3_test.go b/internal/protocols/rtmp/chunk/chunk3_test.go
deleted file mode 100644
index ba5b8fa0..00000000
--- a/internal/protocols/rtmp/chunk/chunk3_test.go
+++ /dev/null
@@ -1,30 +0,0 @@
-package chunk
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-var chunk3enc = []byte{
-	0xd9, 0x1, 0x2, 0x3, 0x4,
-}
-
-var chunk3dec = Chunk3{
-	ChunkStreamID: 25,
-	Body:          []byte{0x01, 0x02, 0x03, 0x04},
-}
-
-func TestChunk3Read(t *testing.T) {
-	var chunk3 Chunk3
-	err := chunk3.Read(bytes.NewReader(chunk3enc), 4)
-	require.NoError(t, err)
-	require.Equal(t, chunk3dec, chunk3)
-}
-
-func TestChunk3Marshal(t *testing.T) {
-	buf, err := chunk3dec.Marshal()
-	require.NoError(t, err)
-	require.Equal(t, chunk3enc, buf)
-}
diff --git a/internal/protocols/rtmp/chunk/chunk_test.go b/internal/protocols/rtmp/chunk/chunk_test.go
new file mode 100644
index 00000000..b7507e3d
--- /dev/null
+++ b/internal/protocols/rtmp/chunk/chunk_test.go
@@ -0,0 +1,158 @@
+package chunk
+
+import (
+	"bytes"
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+var cases = []struct {
+	name                 string
+	enc                  []byte
+	bodyLen              uint32
+	hasExtendedTimestamp bool
+	dec                  Chunk
+}{
+	{
+		"chunk0 standard",
+		[]byte{
+			0x19, 0xb1, 0xa1, 0x91, 0x0, 0x0, 0x14, 0x14,
+			0x3, 0x5d, 0x17, 0x3d, 0x1, 0x2, 0x3, 0x4,
+		},
+		4,
+		false,
+		&Chunk0{
+			ChunkStreamID:   25,
+			Timestamp:       11641233,
+			Type:            20,
+			MessageStreamID: 56432445,
+			BodyLen:         20,
+			Body:            []byte{1, 2, 3, 4},
+		},
+	},
+	{
+		"chunk0 extended timestamp",
+		[]byte{
+			0x19, 0xff, 0xff, 0xff, 0x00, 0x00, 0x14, 0x0f,
+			0x00, 0x31, 0x84, 0xb2, 0xff, 0x34, 0x86, 0xa2,
+			0x05, 0x06, 0x07, 0x08,
+		},
+		4,
+		false,
+		&Chunk0{
+			ChunkStreamID:   25,
+			Timestamp:       0xFF3486a2,
+			Type:            15,
+			MessageStreamID: 3245234,
+			BodyLen:         20,
+			Body:            []byte{5, 6, 7, 8},
+		},
+	},
+	{
+		"chunk1 standard",
+		[]byte{
+			0x59, 0xb1, 0xa1, 0x91, 0x0, 0x0, 0x14, 0x14,
+			0x1, 0x2, 0x3, 0x4,
+		},
+		4,
+		false,
+		&Chunk1{
+			ChunkStreamID:  25,
+			TimestampDelta: 11641233,
+			Type:           20,
+			BodyLen:        20,
+			Body:           []byte{1, 2, 3, 4},
+		},
+	},
+	{
+		"chunk1 extended timestamp",
+		[]byte{
+			0x59, 0xff, 0xff, 0xff, 0x00, 0x00, 0x14, 0x14,
+			0xff, 0x88, 0x4b, 0x6c, 0x05, 0x06, 0x07, 0x08,
+		},
+		4,
+		false,
+		&Chunk1{
+			ChunkStreamID:  25,
+			TimestampDelta: 0xFF884B6C,
+			Type:           20,
+			BodyLen:        20,
+			Body:           []byte{5, 6, 7, 8},
+		},
+	},
+	{
+		"chunk2 standard",
+		[]byte{
+			0x99, 0xb1, 0xa1, 0x91, 0x1, 0x2, 0x3, 0x4,
+		},
+		4,
+		false,
+		&Chunk2{
+			ChunkStreamID:  25,
+			TimestampDelta: 11641233,
+			Body:           []byte{1, 2, 3, 4},
+		},
+	},
+	{
+		"chunk2 extended timestamp",
+		[]byte{
+			0x99, 0xff, 0xff, 0xff, 0xff, 0xaa, 0xbb, 0xcc,
+			0x05, 0x06, 0x07, 0x08,
+		},
+		4,
+		false,
+		&Chunk2{
+			ChunkStreamID:  25,
+			TimestampDelta: 0xFFAABBCC,
+			Body:           []byte{5, 6, 7, 8},
+		},
+	},
+	{
+		"chunk3 standard",
+		[]byte{
+			0xd9, 0x1, 0x2, 0x3, 0x4,
+		},
+		4,
+		false,
+		&Chunk3{
+			ChunkStreamID: 25,
+			Body:          []byte{1, 2, 3, 4},
+		},
+	},
+	{
+		"chunk3 extended timestamp",
+		[]byte{
+			0xd9, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07,
+			0x08,
+		},
+		4,
+		true,
+		&Chunk3{
+			ChunkStreamID: 25,
+			Body:          []byte{5, 6, 7, 8},
+		},
+	},
+}
+
+func TestChunkRead(t *testing.T) {
+	for _, ca := range cases {
+		t.Run(ca.name, func(t *testing.T) {
+			chunk := reflect.New(reflect.TypeOf(ca.dec).Elem()).Interface().(Chunk)
+			err := chunk.Read(bytes.NewReader(ca.enc), ca.bodyLen, ca.hasExtendedTimestamp)
+			require.NoError(t, err)
+			require.Equal(t, ca.dec, chunk)
+		})
+	}
+}
+
+func TestChunkMarshal(t *testing.T) {
+	for _, ca := range cases {
+		t.Run(ca.name, func(t *testing.T) {
+			buf, err := ca.dec.Marshal(ca.hasExtendedTimestamp)
+			require.NoError(t, err)
+			require.Equal(t, ca.enc, buf)
+		})
+	}
+}
diff --git a/internal/protocols/rtmp/rawmessage/reader.go b/internal/protocols/rtmp/rawmessage/reader.go
index 4d97e584..ec4da620 100644
--- a/internal/protocols/rtmp/rawmessage/reader.go
+++ b/internal/protocols/rtmp/rawmessage/reader.go
@@ -37,10 +37,11 @@ type readerChunkStream struct {
 	curBodyRecv                uint32
 	curTimestampDelta          uint32
 	curTimestampDeltaAvailable bool
+	hasExtendedTimestamp       bool
 }
 
-func (rc *readerChunkStream) readChunk(c chunk.Chunk, chunkBodySize uint32) error {
-	err := c.Read(rc.mr.br, chunkBodySize)
+func (rc *readerChunkStream) readChunk(c chunk.Chunk, bodySize uint32, hasExtendedTimestamp bool) error {
+	err := c.Read(rc.mr.br, bodySize, hasExtendedTimestamp)
 	if err != nil {
 		return err
 	}
@@ -70,7 +71,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 			return nil, fmt.Errorf("received type 0 chunk but expected type 3 chunk")
 		}
 
-		err := rc.readChunk(&rc.mr.c0, rc.mr.chunkSize)
+		err := rc.readChunk(&rc.mr.c0, rc.mr.chunkSize, false)
 		if err != nil {
 			return nil, err
 		}
@@ -81,6 +82,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 		rc.curTimestampAvailable = true
 		rc.curTimestampDeltaAvailable = false
 		rc.curBodyLen = rc.mr.c0.BodyLen
+		rc.hasExtendedTimestamp = rc.mr.c0.Timestamp >= 0xFFFFFF
 
 		if rc.curBodyLen > maxBodySize {
 			return nil, fmt.Errorf("body size (%d) exceeds maximum (%d)", rc.curBodyLen, maxBodySize)
@@ -109,7 +111,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 			return nil, fmt.Errorf("received type 1 chunk but expected type 3 chunk")
 		}
 
-		err := rc.readChunk(&rc.mr.c1, rc.mr.chunkSize)
+		err := rc.readChunk(&rc.mr.c1, rc.mr.chunkSize, false)
 		if err != nil {
 			return nil, err
 		}
@@ -119,6 +121,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 		rc.curTimestampDelta = rc.mr.c1.TimestampDelta
 		rc.curTimestampDeltaAvailable = true
 		rc.curBodyLen = rc.mr.c1.BodyLen
+		rc.hasExtendedTimestamp = rc.mr.c1.TimestampDelta >= 0xFFFFFF
 
 		if rc.curBodyLen > maxBodySize {
 			return nil, fmt.Errorf("body size (%d) exceeds maximum (%d)", rc.curBodyLen, maxBodySize)
@@ -152,7 +155,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 			chunkBodyLen = rc.mr.chunkSize
 		}
 
-		err := rc.readChunk(&rc.mr.c2, chunkBodyLen)
+		err := rc.readChunk(&rc.mr.c2, chunkBodyLen, false)
 		if err != nil {
 			return nil, err
 		}
@@ -160,6 +163,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 		rc.curTimestamp += rc.mr.c2.TimestampDelta
 		rc.curTimestampDelta = rc.mr.c2.TimestampDelta
 		rc.curTimestampDeltaAvailable = true
+		rc.hasExtendedTimestamp = rc.mr.c2.TimestampDelta >= 0xFFFFFF
 
 		le := uint32(len(rc.mr.c2.Body))
 
@@ -182,7 +186,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 				chunkBodyLen = rc.mr.chunkSize
 			}
 
-			err := rc.readChunk(&rc.mr.c3, chunkBodyLen)
+			err := rc.readChunk(&rc.mr.c3, chunkBodyLen, rc.hasExtendedTimestamp)
 			if err != nil {
 				return nil, err
 			}
@@ -212,7 +216,7 @@ func (rc *readerChunkStream) readMessage(typ byte) (*Message, error) {
 			chunkBodyLen = rc.mr.chunkSize
 		}
 
-		err := rc.readChunk(&rc.mr.c3, chunkBodyLen)
+		err := rc.readChunk(&rc.mr.c3, chunkBodyLen, rc.hasExtendedTimestamp)
 		if err != nil {
 			return nil, err
 		}
diff --git a/internal/protocols/rtmp/rawmessage/reader_test.go b/internal/protocols/rtmp/rawmessage/reader_test.go
index 43ac2f51..6b65b28e 100644
--- a/internal/protocols/rtmp/rawmessage/reader_test.go
+++ b/internal/protocols/rtmp/rawmessage/reader_test.go
@@ -12,10 +12,9 @@ import (
 )
 
 var cases = []struct {
-	name       string
-	messages   []*Message
-	chunks     []chunk.Chunk
-	chunkSizes []uint32
+	name     string
+	messages []*Message
+	chunks   []chunk.Chunk
 }{
 	{
 		"(chunk0) + (chunk1)",
@@ -52,10 +51,6 @@ var cases = []struct {
 				Body:           bytes.Repeat([]byte{0x04}, 64),
 			},
 		},
-		[]uint32{
-			128,
-			128,
-		},
 	},
 	{
 		"(chunk0) + (chunk2) + (chunk3)",
@@ -101,11 +96,6 @@ var cases = []struct {
 				Body:          bytes.Repeat([]byte{0x05}, 64),
 			},
 		},
-		[]uint32{
-			128,
-			64,
-			64,
-		},
 	},
 	{
 		"(chunk0 + chunk3) + (chunk1 + chunk3) + (chunk2 + chunk3) + (chunk3 + chunk3)",
@@ -181,15 +171,31 @@ var cases = []struct {
 				Body:          bytes.Repeat([]byte{0x06}, 64),
 			},
 		},
-		[]uint32{
-			128,
-			62,
-			128,
-			64,
-			128,
-			64,
-			128,
-			64,
+	},
+	{
+		"(chunk0 + chunk3 with extended timestamp)",
+		[]*Message{
+			{
+				ChunkStreamID:   27,
+				Timestamp:       0xFF123456 * time.Millisecond,
+				Type:            6,
+				MessageStreamID: 3123,
+				Body:            bytes.Repeat([]byte{5}, 160),
+			},
+		},
+		[]chunk.Chunk{
+			&chunk.Chunk0{
+				ChunkStreamID:   27,
+				Timestamp:       4279383126,
+				Type:            6,
+				MessageStreamID: 3123,
+				BodyLen:         160,
+				Body:            bytes.Repeat([]byte{5}, 128),
+			},
+			&chunk.Chunk3{
+				ChunkStreamID: 27,
+				Body:          bytes.Repeat([]byte{5}, 32),
+			},
 		},
 	},
 }
@@ -203,10 +209,13 @@ func TestReader(t *testing.T) {
 				return nil
 			})
 
+			hasExtendedTimestamp := false
+
 			for _, cach := range ca.chunks {
-				buf2, err := cach.Marshal()
+				buf2, err := cach.Marshal(hasExtendedTimestamp)
 				require.NoError(t, err)
 				buf.Write(buf2)
+				hasExtendedTimestamp = chunkHasExtendedTimestamp(cach)
 			}
 
 			for _, camsg := range ca.messages {
@@ -247,7 +256,7 @@ func TestReaderAcknowledge(t *testing.T) {
 				MessageStreamID: 3123,
 				BodyLen:         200,
 				Body:            bytes.Repeat([]byte{0x03}, 200),
-			}.Marshal()
+			}.Marshal(false)
 			require.NoError(t, err)
 			buf.Write(buf2)
 
diff --git a/internal/protocols/rtmp/rawmessage/writer.go b/internal/protocols/rtmp/rawmessage/writer.go
index 62ad748c..868f0d5f 100644
--- a/internal/protocols/rtmp/rawmessage/writer.go
+++ b/internal/protocols/rtmp/rawmessage/writer.go
@@ -11,15 +11,16 @@ import (
 )
 
 type writerChunkStream struct {
-	mw                  *Writer
-	lastMessageStreamID *uint32
-	lastType            *uint8
-	lastBodyLen         *uint32
-	lastTimestamp       *int64
-	lastTimestampDelta  *int64
+	mw                   *Writer
+	lastMessageStreamID  *uint32
+	lastType             *uint8
+	lastBodyLen          *uint32
+	lastTimestamp        *int64
+	lastTimestampDelta   *int64
+	hasExtendedTimestamp bool
 }
 
-func (wc *writerChunkStream) writeChunk(c chunk.Chunk) error {
+func (wc *writerChunkStream) writeChunk(c chunk.Chunk, hasExtendedTimestamp bool) error {
 	// check if we received an acknowledge
 	if wc.mw.checkAcknowledge && wc.mw.ackWindowSize != 0 {
 		diff := uint32(wc.mw.bcw.Count()) - wc.mw.ackValue
@@ -29,7 +30,7 @@ func (wc *writerChunkStream) writeChunk(c chunk.Chunk) error {
 		}
 	}
 
-	buf, err := c.Marshal()
+	buf, err := c.Marshal(hasExtendedTimestamp)
 	if err != nil {
 		return err
 	}
@@ -72,45 +73,51 @@ func (wc *writerChunkStream) writeMessage(msg *Message) error {
 
 			switch {
 			case wc.lastMessageStreamID == nil || timestampDelta == nil || *wc.lastMessageStreamID != msg.MessageStreamID:
+				ts := uint32(timestamp)
 				err := wc.writeChunk(&chunk.Chunk0{
 					ChunkStreamID:   msg.ChunkStreamID,
-					Timestamp:       uint32(timestamp),
+					Timestamp:       ts,
 					Type:            msg.Type,
 					MessageStreamID: msg.MessageStreamID,
 					BodyLen:         (bodyLen),
 					Body:            msg.Body[pos : pos+chunkBodyLen],
-				})
+				}, false)
 				if err != nil {
 					return err
 				}
+				wc.hasExtendedTimestamp = ts >= 0xFFFFFF
 
 			case *wc.lastType != msg.Type || *wc.lastBodyLen != bodyLen:
+				ts := uint32(*timestampDelta)
 				err := wc.writeChunk(&chunk.Chunk1{
 					ChunkStreamID:  msg.ChunkStreamID,
-					TimestampDelta: uint32(*timestampDelta),
+					TimestampDelta: ts,
 					Type:           msg.Type,
 					BodyLen:        (bodyLen),
 					Body:           msg.Body[pos : pos+chunkBodyLen],
-				})
+				}, false)
 				if err != nil {
 					return err
 				}
+				wc.hasExtendedTimestamp = ts >= 0xFFFFFF
 
 			case wc.lastTimestampDelta == nil || *wc.lastTimestampDelta != *timestampDelta:
+				ts := uint32(*timestampDelta)
 				err := wc.writeChunk(&chunk.Chunk2{
 					ChunkStreamID:  msg.ChunkStreamID,
-					TimestampDelta: uint32(*timestampDelta),
+					TimestampDelta: ts,
 					Body:           msg.Body[pos : pos+chunkBodyLen],
-				})
+				}, false)
 				if err != nil {
 					return err
 				}
+				wc.hasExtendedTimestamp = ts >= 0xFFFFFF
 
 			default:
 				err := wc.writeChunk(&chunk.Chunk3{
 					ChunkStreamID: msg.ChunkStreamID,
 					Body:          msg.Body[pos : pos+chunkBodyLen],
-				})
+				}, wc.hasExtendedTimestamp)
 				if err != nil {
 					return err
 				}
@@ -133,7 +140,7 @@ func (wc *writerChunkStream) writeMessage(msg *Message) error {
 			err := wc.writeChunk(&chunk.Chunk3{
 				ChunkStreamID: msg.ChunkStreamID,
 				Body:          msg.Body[pos : pos+chunkBodyLen],
-			})
+			}, wc.hasExtendedTimestamp)
 			if err != nil {
 				return err
 			}
diff --git a/internal/protocols/rtmp/rawmessage/writer_test.go b/internal/protocols/rtmp/rawmessage/writer_test.go
index ce1ebfb6..ff5b7ea1 100644
--- a/internal/protocols/rtmp/rawmessage/writer_test.go
+++ b/internal/protocols/rtmp/rawmessage/writer_test.go
@@ -11,6 +11,34 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func chunkBodySize(ch chunk.Chunk) uint32 {
+	switch ch := ch.(type) {
+	case *chunk.Chunk0:
+		return uint32(len(ch.Body))
+	case *chunk.Chunk1:
+		return uint32(len(ch.Body))
+	case *chunk.Chunk2:
+		return uint32(len(ch.Body))
+	case *chunk.Chunk3:
+		return uint32(len(ch.Body))
+	}
+	return 0
+}
+
+func chunkHasExtendedTimestamp(ch chunk.Chunk) bool {
+	switch ch := ch.(type) {
+	case *chunk.Chunk0:
+		return ch.Timestamp >= 0xFFFFFF
+	case *chunk.Chunk1:
+		return ch.TimestampDelta >= 0xFFFFFF
+	case *chunk.Chunk2:
+		return ch.TimestampDelta >= 0xFFFFFF
+	case *chunk.Chunk3:
+		return false
+	}
+	return false
+}
+
 func TestWriter(t *testing.T) {
 	for _, ca := range cases {
 		t.Run(ca.name, func(t *testing.T) {
@@ -23,11 +51,14 @@ func TestWriter(t *testing.T) {
 				require.NoError(t, err)
 			}
 
-			for i, cach := range ca.chunks {
+			hasExtendedTimestamp := false
+
+			for _, cach := range ca.chunks {
 				ch := reflect.New(reflect.TypeOf(cach).Elem()).Interface().(chunk.Chunk)
-				err := ch.Read(&buf, ca.chunkSizes[i])
+				err := ch.Read(&buf, chunkBodySize(cach), hasExtendedTimestamp)
 				require.NoError(t, err)
 				require.Equal(t, cach, ch)
+				hasExtendedTimestamp = chunkHasExtendedTimestamp(cach)
 			}
 		})
 	}