diff --git a/client_publish_test.go b/client_publish_test.go
index 859b2306..68c50f76 100644
--- a/client_publish_test.go
+++ b/client_publish_test.go
@@ -171,7 +171,7 @@ func TestClientPublishSerial(t *testing.T) {
 				}(),
 			}
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			conn, err := c.DialPublish("rtsp://localhost:8554/teststream",
@@ -313,7 +313,7 @@ func TestClientPublishParallel(t *testing.T) {
 				}(),
 			}
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			writerDone := make(chan struct{})
@@ -471,7 +471,7 @@ func TestClientPublishPauseSerial(t *testing.T) {
 				}(),
 			}
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			conn, err := c.DialPublish("rtsp://localhost:8554/teststream",
@@ -609,7 +609,7 @@ func TestClientPublishPauseParallel(t *testing.T) {
 				}(),
 			}
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			conn, err := c.DialPublish("rtsp://localhost:8554/teststream",
@@ -747,7 +747,7 @@ func TestClientPublishAutomaticProtocol(t *testing.T) {
 		require.NoError(t, err)
 	}()
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	conn, err := DialPublish("rtsp://localhost:8554/teststream",
@@ -888,7 +888,7 @@ func TestClientPublishRTCPReport(t *testing.T) {
 		senderReportPeriod: 1 * time.Second,
 	}
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	conn, err := c.DialPublish("rtsp://localhost:8554/teststream",
diff --git a/client_read_test.go b/client_read_test.go
index 3331cace..f4e8f18c 100644
--- a/client_read_test.go
+++ b/client_read_test.go
@@ -23,13 +23,13 @@ import (
 )
 
 func TestClientReadTracks(t *testing.T) {
-	track1, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track1, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
-	track2, err := NewTrackAAC(96, []byte{17, 144})
+	track2, err := NewTrackAAC(96, &TrackConfigAAC{Type: 1, SampleRate: 44100, ChannelCount: 2})
 	require.NoError(t, err)
 
-	track3, err := NewTrackAAC(96, []byte{0x12, 0x30})
+	track3, err := NewTrackAAC(96, &TrackConfigAAC{Type: 1, SampleRate: 96000, ChannelCount: 2})
 	require.NoError(t, err)
 
 	l, err := net.Listen("tcp", "localhost:8554")
@@ -221,7 +221,7 @@ func TestClientRead(t *testing.T) {
 				require.Equal(t, base.Describe, req.Method)
 				require.Equal(t, mustParseURL(scheme+"://"+listenIP+":8554/teststream"), req.URL)
 
-				track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+				track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 				require.NoError(t, err)
 
 				tracks := cloneAndClearTracks(Tracks{track})
@@ -463,10 +463,10 @@ func TestClientReadPartial(t *testing.T) {
 		require.Equal(t, base.Describe, req.Method)
 		require.Equal(t, mustParseURL("rtsp://"+listenIP+":8554/teststream"), req.URL)
 
-		track1, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track1, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
-		track2, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track2, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track1, track2})
@@ -611,7 +611,7 @@ func TestClientReadNoContentBase(t *testing.T) {
 		require.Equal(t, base.Describe, req.Method)
 		require.Equal(t, mustParseURL("rtsp://localhost:8554/teststream"), req.URL)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -719,7 +719,7 @@ func TestClientReadAnyPort(t *testing.T) {
 				require.NoError(t, err)
 				require.Equal(t, base.Describe, req.Method)
 
-				track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+				track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 				require.NoError(t, err)
 
 				tracks := cloneAndClearTracks(Tracks{track})
@@ -847,7 +847,7 @@ func TestClientReadAutomaticProtocol(t *testing.T) {
 			require.NoError(t, err)
 			require.Equal(t, base.Describe, req.Method)
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			tracks := cloneAndClearTracks(Tracks{track})
@@ -979,7 +979,7 @@ func TestClientReadAutomaticProtocol(t *testing.T) {
 			err = v.ValidateRequest(req, nil)
 			require.NoError(t, err)
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			tracks := cloneAndClearTracks(Tracks{track})
@@ -1172,7 +1172,7 @@ func TestClientReadDifferentInterleavedIDs(t *testing.T) {
 		require.Equal(t, base.Describe, req.Method)
 		require.Equal(t, mustParseURL("rtsp://localhost:8554/teststream"), req.URL)
 
-		track1, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track1, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track1})
@@ -1334,7 +1334,7 @@ func TestClientReadRedirect(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, base.Describe, req.Method)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -1493,7 +1493,7 @@ func TestClientReadPause(t *testing.T) {
 				require.NoError(t, err)
 				require.Equal(t, base.Describe, req.Method)
 
-				track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+				track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 				require.NoError(t, err)
 
 				tracks := cloneAndClearTracks(Tracks{track})
@@ -1679,7 +1679,7 @@ func TestClientReadRTCPReport(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, base.Describe, req.Method)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -1854,7 +1854,7 @@ func TestClientReadErrorTimeout(t *testing.T) {
 				require.NoError(t, err)
 				require.Equal(t, base.Describe, req.Method)
 
-				track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+				track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 				require.NoError(t, err)
 
 				tracks := cloneAndClearTracks(Tracks{track})
@@ -2011,7 +2011,7 @@ func TestClientReadIgnoreTCPInvalidTrack(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, base.Describe, req.Method)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -2141,7 +2141,7 @@ func TestClientReadSeek(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, base.Describe, req.Method)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
diff --git a/client_test.go b/client_test.go
index 2ca3b965..9631d551 100644
--- a/client_test.go
+++ b/client_test.go
@@ -69,7 +69,7 @@ func TestClientSession(t *testing.T) {
 
 		require.Equal(t, base.HeaderValue{"123456"}, req.Header["Session"])
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -149,7 +149,7 @@ func TestClientAuth(t *testing.T) {
 		err = v.ValidateRequest(req, nil)
 		require.NoError(t, err)
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := cloneAndClearTracks(Tracks{track})
@@ -212,7 +212,7 @@ func TestClientDescribeCharset(t *testing.T) {
 		require.Equal(t, base.Describe, req.Method)
 		require.Equal(t, mustParseURL("rtsp://localhost:8554/teststream"), req.URL)
 
-		track1, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track1, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		err = base.Response{
diff --git a/examples/client-publish-options/main.go b/examples/client-publish-options/main.go
index d89d80c5..59fc7e99 100644
--- a/examples/client-publish-options/main.go
+++ b/examples/client-publish-options/main.go
@@ -36,7 +36,7 @@ func main() {
 	fmt.Println("stream connected")
 
 	// create a H264 track
-	track, err := gortsplib.NewTrackH264(96, sps, pps)
+	track, err := gortsplib.NewTrackH264(96, &gortsplib.TrackConfigH264{sps, pps})
 	if err != nil {
 		panic(err)
 	}
diff --git a/examples/client-publish-pause/main.go b/examples/client-publish-pause/main.go
index 9e605d6f..39685374 100644
--- a/examples/client-publish-pause/main.go
+++ b/examples/client-publish-pause/main.go
@@ -37,7 +37,7 @@ func main() {
 	fmt.Println("stream connected")
 
 	// create a H264 track
-	track, err := gortsplib.NewTrackH264(96, sps, pps)
+	track, err := gortsplib.NewTrackH264(96, &gortsplib.TrackConfigH264{sps, pps})
 	if err != nil {
 		panic(err)
 	}
diff --git a/examples/client-publish/main.go b/examples/client-publish/main.go
index 612163cf..0620a23b 100644
--- a/examples/client-publish/main.go
+++ b/examples/client-publish/main.go
@@ -34,7 +34,7 @@ func main() {
 	fmt.Println("stream connected")
 
 	// create a H264 track
-	track, err := gortsplib.NewTrackH264(96, sps, pps)
+	track, err := gortsplib.NewTrackH264(96, &gortsplib.TrackConfigH264{sps, pps})
 	if err != nil {
 		panic(err)
 	}
diff --git a/pkg/rtpaac/mpeg4audioconfig.go b/pkg/rtpaac/mpeg4audioconfig.go
index 124adabd..a8e213b9 100644
--- a/pkg/rtpaac/mpeg4audioconfig.go
+++ b/pkg/rtpaac/mpeg4audioconfig.go
@@ -3,6 +3,7 @@ package rtpaac
 import (
 	"bytes"
 	"fmt"
+	"io"
 
 	"github.com/icza/bitio"
 )
@@ -43,12 +44,13 @@ var channelCounts = []int{
 
 // MPEG4AudioConfig is a MPEG-4 Audio configuration.
 type MPEG4AudioConfig struct {
-	Type         MPEG4AudioType
-	SampleRate   int
-	ChannelCount int
+	Type              MPEG4AudioType
+	SampleRate        int
+	ChannelCount      int
+	AOTSpecificConfig []byte
 }
 
-// Decode decodes an MPEG-4 Audio configuration.
+// Decode decodes an MPEG4AudioConfig.
 func (c *MPEG4AudioConfig) Decode(byts []byte) error {
 	// ref: https://wiki.multimedia.cx/index.php/MPEG-4_Audio
 
@@ -60,14 +62,6 @@ func (c *MPEG4AudioConfig) Decode(byts []byte) error {
 	}
 	c.Type = MPEG4AudioType(tmp)
 
-	if tmp == 31 {
-		tmp, err = r.ReadBits(6)
-		if err != nil {
-			return err
-		}
-		c.Type = MPEG4AudioType(tmp + 32)
-	}
-
 	switch c.Type {
 	case MPEG4AudioTypeAACLC:
 	default:
@@ -110,5 +104,64 @@ func (c *MPEG4AudioConfig) Decode(byts []byte) error {
 		return fmt.Errorf("invalid channel configuration (%d)", channelConfig)
 	}
 
+	for {
+		byt, err := r.ReadBits(8)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+
+		c.AOTSpecificConfig = append(c.AOTSpecificConfig, uint8(byt))
+	}
+
 	return nil
 }
+
+// Encode encodes an MPEG4AudioConfig.
+func (c MPEG4AudioConfig) Encode() ([]byte, error) {
+	var buf bytes.Buffer
+	w := bitio.NewWriter(&buf)
+
+	w.WriteBits(uint64(c.Type), 5)
+
+	sampleRateIndex := func() int {
+		for i, s := range sampleRates {
+			if s == c.SampleRate {
+				return i
+			}
+		}
+		return -1
+	}()
+
+	if sampleRateIndex != -1 {
+		w.WriteBits(uint64(sampleRateIndex), 4)
+	} else {
+		w.WriteBits(uint64(15), 4)
+		w.WriteBits(uint64(c.SampleRate), 24)
+	}
+
+	channelConfig := func() int {
+		for i, co := range channelCounts {
+			if co == c.ChannelCount {
+				return i + 1
+			}
+		}
+		return -1
+	}()
+
+	if channelConfig == -1 {
+		return nil, fmt.Errorf("invalid channel count (%d)", c.ChannelCount)
+	}
+
+	w.WriteBits(uint64(channelConfig), 4)
+
+	for _, b := range c.AOTSpecificConfig {
+		w.WriteBits(uint64(b), 8)
+	}
+
+	w.Close()
+
+	return buf.Bytes(), nil
+}
diff --git a/pkg/rtpaac/mpeg4audioconfig_test.go b/pkg/rtpaac/mpeg4audioconfig_test.go
index 8bb348ed..598a9a4d 100644
--- a/pkg/rtpaac/mpeg4audioconfig_test.go
+++ b/pkg/rtpaac/mpeg4audioconfig_test.go
@@ -15,9 +15,10 @@ var configCases = []struct {
 		"aac-lc 44.1khz mono",
 		[]byte{0x12, 0x08, 0x56, 0xe5, 0x00},
 		MPEG4AudioConfig{
-			Type:         MPEG4AudioTypeAACLC,
-			SampleRate:   44100,
-			ChannelCount: 1,
+			Type:              MPEG4AudioTypeAACLC,
+			SampleRate:        44100,
+			ChannelCount:      1,
+			AOTSpecificConfig: []byte{0x0A, 0xDC, 0xA0},
 		},
 	},
 	{
@@ -33,9 +34,10 @@ var configCases = []struct {
 		"aac-lc 96khz stereo",
 		[]byte{0x10, 0x10, 0x56, 0xE5, 0x00},
 		MPEG4AudioConfig{
-			Type:         MPEG4AudioTypeAACLC,
-			SampleRate:   96000,
-			ChannelCount: 2,
+			Type:              MPEG4AudioTypeAACLC,
+			SampleRate:        96000,
+			ChannelCount:      2,
+			AOTSpecificConfig: []byte{0x0A, 0xDC, 0xA0},
 		},
 	},
 	{
@@ -81,14 +83,9 @@ func TestConfigDecodeErrors(t *testing.T) {
 			"EOF",
 		},
 		{
-			"extended type missing",
-			[]byte{31 << 3},
-			"EOF",
-		},
-		{
-			"extended type invalid",
-			[]byte{31 << 3, 20},
-			"unsupported type: 32",
+			"unsupported type",
+			[]byte{18 << 3},
+			"unsupported type: 18",
 		},
 		{
 			"sample rate missing",
@@ -123,3 +120,36 @@ func TestConfigDecodeErrors(t *testing.T) {
 		})
 	}
 }
+
+func TestConfigEncode(t *testing.T) {
+	for _, ca := range configCases {
+		t.Run(ca.name, func(t *testing.T) {
+			enc, err := ca.dec.Encode()
+			require.NoError(t, err)
+			require.Equal(t, ca.enc, enc)
+		})
+	}
+}
+
+func TestConfigEncodeErrors(t *testing.T) {
+	for _, ca := range []struct {
+		name string
+		conf MPEG4AudioConfig
+		err  string
+	}{
+		{
+			"invalid channel config",
+			MPEG4AudioConfig{
+				Type:         2,
+				SampleRate:   44100,
+				ChannelCount: 0,
+			},
+			"invalid channel count (0)",
+		},
+	} {
+		t.Run(ca.name, func(t *testing.T) {
+			_, err := ca.conf.Encode()
+			require.Equal(t, ca.err, err.Error())
+		})
+	}
+}
diff --git a/server_publish_test.go b/server_publish_test.go
index b7cae9e4..0e5309d2 100644
--- a/server_publish_test.go
+++ b/server_publish_test.go
@@ -100,7 +100,7 @@ func TestServerPublishErrorAnnounce(t *testing.T) {
 					"Content-Type": base.HeaderValue{"application/sdp"},
 				},
 				Body: func() []byte {
-					track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+					track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 					require.NoError(t, err)
 					track.Media.Attributes = append(track.Media.Attributes, psdp.Attribute{
 						Key:   "control",
@@ -139,7 +139,7 @@ func TestServerPublishErrorAnnounce(t *testing.T) {
 					"Content-Type": base.HeaderValue{"application/sdp"},
 				},
 				Body: func() []byte {
-					track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+					track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 					require.NoError(t, err)
 					track.Media.Attributes = append(track.Media.Attributes, psdp.Attribute{
 						Key:   "control",
@@ -178,7 +178,7 @@ func TestServerPublishErrorAnnounce(t *testing.T) {
 					"Content-Type": base.HeaderValue{"application/sdp"},
 				},
 				Body: func() []byte {
-					track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+					track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 					require.NoError(t, err)
 					track.Media.Attributes = append(track.Media.Attributes, psdp.Attribute{
 						Key:   "control",
@@ -320,7 +320,7 @@ func TestServerPublishSetupPath(t *testing.T) {
 			defer conn.Close()
 			bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 			track.Media.Attributes = append(track.Media.Attributes, psdp.Attribute{
 				Key:   "control",
@@ -415,7 +415,7 @@ func TestServerPublishErrorSetupDifferentPaths(t *testing.T) {
 	defer conn.Close()
 	bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	tracks := Tracks{track}
@@ -497,7 +497,7 @@ func TestServerPublishErrorSetupTrackTwice(t *testing.T) {
 	defer conn.Close()
 	bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	tracks := Tracks{track}
@@ -596,10 +596,10 @@ func TestServerPublishErrorRecordPartialTracks(t *testing.T) {
 	defer conn.Close()
 	bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-	track1, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track1, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
-	track2, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track2, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	tracks := Tracks{track1, track2}
@@ -749,7 +749,7 @@ func TestServerPublish(t *testing.T) {
 
 			<-connOpened
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			tracks := Tracks{track}
@@ -937,7 +937,7 @@ func TestServerPublishErrorInvalidProtocol(t *testing.T) {
 	defer conn.Close()
 	bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	tracks := Tracks{track}
@@ -1038,7 +1038,7 @@ func TestServerPublishRTCPReport(t *testing.T) {
 	defer conn.Close()
 	bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	tracks := Tracks{track}
@@ -1197,7 +1197,7 @@ func TestServerPublishTimeout(t *testing.T) {
 			defer nconn.Close()
 			bconn := bufio.NewReadWriter(bufio.NewReader(nconn), bufio.NewWriter(nconn))
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			tracks := Tracks{track}
@@ -1324,7 +1324,7 @@ func TestServerPublishWithoutTeardown(t *testing.T) {
 			require.NoError(t, err)
 			bconn := bufio.NewReadWriter(bufio.NewReader(nconn), bufio.NewWriter(nconn))
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			tracks := Tracks{track}
@@ -1443,7 +1443,7 @@ func TestServerPublishUDPChangeConn(t *testing.T) {
 		defer conn.Close()
 		bconn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
-		track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+		track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 		require.NoError(t, err)
 
 		tracks := Tracks{track}
diff --git a/server_read_test.go b/server_read_test.go
index 644d4198..55aa8edf 100644
--- a/server_read_test.go
+++ b/server_read_test.go
@@ -89,7 +89,7 @@ func TestServerReadSetupPath(t *testing.T) {
 		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			stream := NewServerStream(Tracks{track, track, track, track, track})
@@ -145,7 +145,7 @@ func TestServerReadSetupPath(t *testing.T) {
 func TestServerReadErrorSetupDifferentPaths(t *testing.T) {
 	connClosed := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -217,7 +217,7 @@ func TestServerReadErrorSetupDifferentPaths(t *testing.T) {
 func TestServerReadErrorSetupTrackTwice(t *testing.T) {
 	connClosed := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -300,7 +300,7 @@ func TestServerRead(t *testing.T) {
 			sessionClosed := make(chan struct{})
 			framesReceived := make(chan struct{})
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			stream := NewServerStream(Tracks{track})
@@ -593,7 +593,7 @@ func TestServerReadTCPResponseBeforeFrames(t *testing.T) {
 	writerDone := make(chan struct{})
 	writerTerminate := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -686,7 +686,7 @@ func TestServerReadTCPResponseBeforeFrames(t *testing.T) {
 }
 
 func TestServerReadPlayPlay(t *testing.T) {
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -767,7 +767,7 @@ func TestServerReadPlayPausePlay(t *testing.T) {
 	writerDone := make(chan struct{})
 	writerTerminate := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -884,7 +884,7 @@ func TestServerReadPlayPausePause(t *testing.T) {
 	writerDone := make(chan struct{})
 	writerTerminate := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -1008,7 +1008,7 @@ func TestServerReadTimeout(t *testing.T) {
 		t.Run(proto, func(t *testing.T) {
 			sessionClosed := make(chan struct{})
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			stream := NewServerStream(Tracks{track})
@@ -1100,7 +1100,7 @@ func TestServerReadWithoutTeardown(t *testing.T) {
 			connClosed := make(chan struct{})
 			sessionClosed := make(chan struct{})
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			stream := NewServerStream(Tracks{track})
@@ -1197,7 +1197,7 @@ func TestServerReadWithoutTeardown(t *testing.T) {
 }
 
 func TestServerReadUDPChangeConn(t *testing.T) {
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -1295,7 +1295,7 @@ func TestServerReadUDPChangeConn(t *testing.T) {
 }
 
 func TestServerReadNonSetuppedPath(t *testing.T) {
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -1459,7 +1459,7 @@ func TestServerReadAdditionalInfos(t *testing.T) {
 		return &ri, ssrcs
 	}
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track, track})
diff --git a/server_test.go b/server_test.go
index f5bb90d5..af882f67 100644
--- a/server_test.go
+++ b/server_test.go
@@ -633,7 +633,7 @@ func TestServerErrorInvalidMethod(t *testing.T) {
 }
 
 func TestServerErrorTCPTwoConnOneSession(t *testing.T) {
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -730,7 +730,7 @@ func TestServerErrorTCPTwoConnOneSession(t *testing.T) {
 }
 
 func TestServerErrorTCPOneConnTwoSessions(t *testing.T) {
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -989,7 +989,7 @@ func TestServerSessionClose(t *testing.T) {
 func TestServerSessionAutoClose(t *testing.T) {
 	sessionClosed := make(chan struct{})
 
-	track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+	track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 	require.NoError(t, err)
 
 	stream := NewServerStream(Tracks{track})
@@ -1055,7 +1055,7 @@ func TestServerErrorInvalidPath(t *testing.T) {
 		t.Run(string(method), func(t *testing.T) {
 			connClosed := make(chan struct{})
 
-			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+			track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 			require.NoError(t, err)
 
 			stream := NewServerStream(Tracks{track})
@@ -1096,7 +1096,7 @@ func TestServerErrorInvalidPath(t *testing.T) {
 			sxID := ""
 
 			if method == base.Record {
-				track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
+				track, err := NewTrackH264(96, &TrackConfigH264{[]byte{0x01, 0x02, 0x03, 0x04}, []byte{0x01, 0x02, 0x03, 0x04}})
 				require.NoError(t, err)
 
 				tracks := Tracks{track}
diff --git a/track.go b/track.go
index 171b4298..fcf81aff 100644
--- a/track.go
+++ b/track.go
@@ -20,6 +20,20 @@ type Track struct {
 	Media *psdp.MediaDescription
 }
 
+// TrackConfigH264 is the configuration of an H264 track.
+type TrackConfigH264 struct {
+	SPS []byte
+	PPS []byte
+}
+
+// TrackConfigAAC is the configuration of an AAC track.
+type TrackConfigAAC struct {
+	Type              int
+	SampleRate        int
+	ChannelCount      int
+	AOTSpecificConfig []byte
+}
+
 func (t *Track) hasControlAttribute() bool {
 	for _, attr := range t.Media.Attributes {
 		if attr.Key == "control" {
@@ -127,10 +141,10 @@ func (t *Track) ClockRate() (int, error) {
 }
 
 // NewTrackH264 initializes an H264 track from a SPS and PPS.
-func NewTrackH264(payloadType uint8, sps []byte, pps []byte) (*Track, error) {
-	spropParameterSets := base64.StdEncoding.EncodeToString(sps) +
-		"," + base64.StdEncoding.EncodeToString(pps)
-	profileLevelID := strings.ToUpper(hex.EncodeToString(sps[1:4]))
+func NewTrackH264(payloadType uint8, conf *TrackConfigH264) (*Track, error) {
+	spropParameterSets := base64.StdEncoding.EncodeToString(conf.SPS) +
+		"," + base64.StdEncoding.EncodeToString(conf.PPS)
+	profileLevelID := strings.ToUpper(hex.EncodeToString(conf.SPS[1:4]))
 
 	typ := strconv.FormatInt(int64(payloadType), 10)
 
@@ -176,21 +190,18 @@ func (t *Track) IsH264() bool {
 	return vals[1] == "H264/90000"
 }
 
-// ExtractDataH264 extracts the SPS and PPS from an H264 track.
-func (t *Track) ExtractDataH264() ([]byte, []byte, error) {
+// ExtractConfigH264 extracts the configuration from an H264 track.
+func (t *Track) ExtractConfigH264() (*TrackConfigH264, error) {
 	v, ok := t.Media.Attribute("fmtp")
 	if !ok {
-		return nil, nil, fmt.Errorf("fmtp attribute is missing")
+		return nil, fmt.Errorf("fmtp attribute is missing")
 	}
 
 	tmp := strings.SplitN(v, " ", 2)
 	if len(tmp) != 2 {
-		return nil, nil, fmt.Errorf("invalid fmtp attribute (%v)", v)
+		return nil, fmt.Errorf("invalid fmtp attribute (%v)", v)
 	}
 
-	var sps []byte
-	var pps []byte
-
 	for _, kv := range strings.Split(tmp[1], ";") {
 		kv = strings.Trim(kv, " ")
 
@@ -200,41 +211,47 @@ func (t *Track) ExtractDataH264() ([]byte, []byte, error) {
 
 		tmp := strings.SplitN(kv, "=", 2)
 		if len(tmp) != 2 {
-			return nil, nil, fmt.Errorf("invalid fmtp attribute (%v)", v)
+			return nil, fmt.Errorf("invalid fmtp attribute (%v)", v)
 		}
 
 		if tmp[0] == "sprop-parameter-sets" {
 			tmp := strings.SplitN(tmp[1], ",", 2)
 			if len(tmp) != 2 {
-				return nil, nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
+				return nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
 			}
 
-			var err error
-			sps, err = base64.StdEncoding.DecodeString(tmp[0])
+			sps, err := base64.StdEncoding.DecodeString(tmp[0])
 			if err != nil {
-				return nil, nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
+				return nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
 			}
 
-			pps, err = base64.StdEncoding.DecodeString(tmp[1])
+			pps, err := base64.StdEncoding.DecodeString(tmp[1])
 			if err != nil {
-				return nil, nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
+				return nil, fmt.Errorf("invalid sprop-parameter-sets (%v)", v)
 			}
+
+			conf := &TrackConfigH264{
+				SPS: sps,
+				PPS: pps,
+			}
+
+			return conf, nil
 		}
 	}
 
-	if sps == nil || pps == nil {
-		return nil, nil, fmt.Errorf("sprop-parameter-sets is missing (%v)", v)
-	}
-
-	return sps, pps, nil
+	return nil, fmt.Errorf("sprop-parameter-sets is missing (%v)", v)
 }
 
-// NewTrackAAC initializes an AAC track from a configuration.
-func NewTrackAAC(payloadType uint8, config []byte) (*Track, error) {
-	var conf rtpaac.MPEG4AudioConfig
-	err := conf.Decode(config)
+// NewTrackAAC initializes an AAC track.
+func NewTrackAAC(payloadType uint8, conf *TrackConfigAAC) (*Track, error) {
+	mpegConf, err := rtpaac.MPEG4AudioConfig{
+		Type:              rtpaac.MPEG4AudioType(conf.Type),
+		SampleRate:        conf.SampleRate,
+		ChannelCount:      conf.ChannelCount,
+		AOTSpecificConfig: conf.AOTSpecificConfig,
+	}.Encode()
 	if err != nil {
-		return nil, fmt.Errorf("invalid MPEG-4 Audio config: %v", err)
+		return nil, err
 	}
 
 	typ := strconv.FormatInt(int64(payloadType), 10)
@@ -259,7 +276,7 @@ func NewTrackAAC(payloadType uint8, config []byte) (*Track, error) {
 						"sizelength=13; " +
 						"indexlength=3; " +
 						"indexdeltalength=3; " +
-						"config=" + hex.EncodeToString(config),
+						"config=" + hex.EncodeToString(mpegConf),
 				},
 			},
 		},
@@ -285,8 +302,8 @@ func (t *Track) IsAAC() bool {
 	return strings.HasPrefix(strings.ToLower(vals[1]), "mpeg4-generic/")
 }
 
-// ExtractDataAAC extracts the config from an AAC track.
-func (t *Track) ExtractDataAAC() ([]byte, error) {
+// ExtractConfigAAC extracts the configuration from an AAC track.
+func (t *Track) ExtractConfigAAC() (*TrackConfigAAC, error) {
 	v, ok := t.Media.Attribute("fmtp")
 	if !ok {
 		return nil, fmt.Errorf("fmtp attribute is missing")
@@ -297,8 +314,6 @@ func (t *Track) ExtractDataAAC() ([]byte, error) {
 		return nil, fmt.Errorf("invalid fmtp (%v)", v)
 	}
 
-	var config []byte
-
 	for _, kv := range strings.Split(tmp[1], ";") {
 		kv = strings.Trim(kv, " ")
 
@@ -312,19 +327,29 @@ func (t *Track) ExtractDataAAC() ([]byte, error) {
 		}
 
 		if tmp[0] == "config" {
-			var err error
-			config, err = hex.DecodeString(tmp[1])
+			enc, err := hex.DecodeString(tmp[1])
 			if err != nil {
-				return nil, fmt.Errorf("invalid config (%v)", v)
+				return nil, fmt.Errorf("invalid AAC config (%v)", tmp[1])
 			}
+
+			var mpegConf rtpaac.MPEG4AudioConfig
+			err = mpegConf.Decode(enc)
+			if err != nil {
+				return nil, fmt.Errorf("invalid AAC config (%v)", tmp[1])
+			}
+
+			conf := &TrackConfigAAC{
+				Type:              int(mpegConf.Type),
+				SampleRate:        mpegConf.SampleRate,
+				ChannelCount:      mpegConf.ChannelCount,
+				AOTSpecificConfig: mpegConf.AOTSpecificConfig,
+			}
+
+			return conf, nil
 		}
 	}
 
-	if config == nil {
-		return nil, fmt.Errorf("config is missing (%v)", v)
-	}
-
-	return config, nil
+	return nil, fmt.Errorf("config is missing (%v)", v)
 }
 
 // Tracks is a list of tracks.
diff --git a/track_test.go b/track_test.go
index a47cd9a4..4955c8eb 100644
--- a/track_test.go
+++ b/track_test.go
@@ -225,7 +225,7 @@ func TestTrackH264New(t *testing.T) {
 		0x68, 0xee, 0x3c, 0x80,
 	}
 
-	tr, err := NewTrackH264(96, sps, pps)
+	tr, err := NewTrackH264(96, &TrackConfigH264{sps, pps})
 	require.NoError(t, err)
 	require.Equal(t, &Track{
 		Media: &psdp.MediaDescription{
@@ -282,12 +282,11 @@ func TestTrackIsH264(t *testing.T) {
 	}
 }
 
-func TestTrackH264Extract(t *testing.T) {
+func TestTrackExtractConfigH264(t *testing.T) {
 	for _, ca := range []struct {
 		name  string
 		track *Track
-		sps   []byte
-		pps   []byte
+		conf  *TrackConfigH264
 	}{
 		{
 			"generic",
@@ -310,13 +309,15 @@ func TestTrackH264Extract(t *testing.T) {
 					},
 				},
 			},
-			[]byte{
-				0x67, 0x64, 0x00, 0x0c, 0xac, 0x3b, 0x50, 0xb0,
-				0x4b, 0x42, 0x00, 0x00, 0x03, 0x00, 0x02, 0x00,
-				0x00, 0x03, 0x00, 0x3d, 0x08,
-			},
-			[]byte{
-				0x68, 0xee, 0x3c, 0x80,
+			&TrackConfigH264{
+				SPS: []byte{
+					0x67, 0x64, 0x00, 0x0c, 0xac, 0x3b, 0x50, 0xb0,
+					0x4b, 0x42, 0x00, 0x00, 0x03, 0x00, 0x02, 0x00,
+					0x00, 0x03, 0x00, 0x3d, 0x08,
+				},
+				PPS: []byte{
+					0x68, 0xee, 0x3c, 0x80,
+				},
 			},
 		},
 		{
@@ -340,27 +341,28 @@ func TestTrackH264Extract(t *testing.T) {
 					},
 				},
 			},
-			[]byte{
-				0x67, 0x64, 0x00, 0x1f, 0xac, 0xd9, 0x40, 0x50,
-				0x05, 0xbb, 0x01, 0x6c, 0x80, 0x00, 0x00, 0x03,
-				0x00, 0x80, 0x00, 0x00, 0x1e, 0x07, 0x8c, 0x18,
-				0xcb,
-			},
-			[]byte{
-				0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0,
+			&TrackConfigH264{
+				SPS: []byte{
+					0x67, 0x64, 0x00, 0x1f, 0xac, 0xd9, 0x40, 0x50,
+					0x05, 0xbb, 0x01, 0x6c, 0x80, 0x00, 0x00, 0x03,
+					0x00, 0x80, 0x00, 0x00, 0x1e, 0x07, 0x8c, 0x18,
+					0xcb,
+				},
+				PPS: []byte{
+					0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0,
+				},
 			},
 		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
-			sps, pps, err := ca.track.ExtractDataH264()
+			conf, err := ca.track.ExtractConfigH264()
 			require.NoError(t, err)
-			require.Equal(t, ca.sps, sps)
-			require.Equal(t, ca.pps, pps)
+			require.Equal(t, ca.conf, conf)
 		})
 	}
 }
 
-func TestTrackH264ExtractErrors(t *testing.T) {
+func TestTrackConfigH264Errors(t *testing.T) {
 	for _, ca := range []struct {
 		name  string
 		track *Track
@@ -525,14 +527,14 @@ func TestTrackH264ExtractErrors(t *testing.T) {
 		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
-			_, _, err := ca.track.ExtractDataH264()
+			_, err := ca.track.ExtractConfigH264()
 			require.Equal(t, ca.err, err.Error())
 		})
 	}
 }
 
 func TestTrackAACNew(t *testing.T) {
-	tr, err := NewTrackAAC(96, []byte{17, 144})
+	track, err := NewTrackAAC(96, &TrackConfigAAC{Type: 2, SampleRate: 48000, ChannelCount: 2})
 	require.NoError(t, err)
 	require.Equal(t, &Track{
 		Media: &psdp.MediaDescription{
@@ -552,7 +554,7 @@ func TestTrackAACNew(t *testing.T) {
 				},
 			},
 		},
-	}, tr)
+	}, track)
 }
 
 func TestTrackIsAAC(t *testing.T) {
@@ -611,11 +613,11 @@ func TestTrackIsAAC(t *testing.T) {
 	}
 }
 
-func TestTrackAACExtract(t *testing.T) {
+func TestTrackExtractConfigAAC(t *testing.T) {
 	for _, ca := range []struct {
-		name   string
-		track  *Track
-		config []byte
+		name  string
+		track *Track
+		conf  *TrackConfigAAC
 	}{
 		{
 			"generic",
@@ -638,7 +640,11 @@ func TestTrackAACExtract(t *testing.T) {
 					},
 				},
 			},
-			[]byte{17, 144},
+			&TrackConfigAAC{
+				Type:         2,
+				SampleRate:   48000,
+				ChannelCount: 2,
+			},
 		},
 		{
 			"vlc rtsp server",
@@ -661,18 +667,22 @@ func TestTrackAACExtract(t *testing.T) {
 					},
 				},
 			},
-			[]byte{17, 144},
+			&TrackConfigAAC{
+				Type:         2,
+				SampleRate:   48000,
+				ChannelCount: 2,
+			},
 		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
-			config, err := ca.track.ExtractDataAAC()
+			conf, err := ca.track.ExtractConfigAAC()
 			require.NoError(t, err)
-			require.Equal(t, ca.config, config)
+			require.Equal(t, ca.conf, conf)
 		})
 	}
 }
 
-func TestTrackAACExtractErrors(t *testing.T) {
+func TestTrackConfigAACErrors(t *testing.T) {
 	for _, ca := range []struct {
 		name  string
 		track *Track
@@ -787,11 +797,11 @@ func TestTrackAACExtractErrors(t *testing.T) {
 					},
 				},
 			},
-			"invalid config (96 profile-level-id=1; config=zz)",
+			"invalid AAC config (zz)",
 		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
-			_, err := ca.track.ExtractDataAAC()
+			_, err := ca.track.ExtractConfigAAC()
 			require.Equal(t, ca.err, err.Error())
 		})
 	}