diff --git a/Makefile b/Makefile
index 0420da27..ad4827f5 100644
--- a/Makefile
+++ b/Makefile
@@ -80,7 +80,6 @@ endif
 
 test-internal:
 	go test -v $(TEST_INTERNAL_OPTS) \
-	./internal/aac \
 	./internal/conf \
 	./internal/confenv \
 	./internal/confwatcher \
diff --git a/go.mod b/go.mod
index 51f576c7..9aba2736 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.16
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
-	github.com/aler9/gortsplib v0.0.0-20210923180721-13c6b69d302d
+	github.com/aler9/gortsplib v0.0.0-20210923181911-321fe06c6dab
 	github.com/asticode/go-astits v1.9.0
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gin-gonic/gin v1.7.2
diff --git a/go.sum b/go.sum
index 465ec0f2..97de03e8 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafo
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/aler9/gortsplib v0.0.0-20210923180721-13c6b69d302d h1:aiMG2qO6tpLgXYeaWH/o/RT9en/tMNco/KZ9XN+QOt0=
-github.com/aler9/gortsplib v0.0.0-20210923180721-13c6b69d302d/go.mod h1:DKI+t4Wj5YjkpxmiQhmG3qRG5VMOprDQvto62wMO68c=
+github.com/aler9/gortsplib v0.0.0-20210923181911-321fe06c6dab h1:Dp3zUKCN/74UdxYBvHNKJubuYZeesDDCAB4gx6wZYh4=
+github.com/aler9/gortsplib v0.0.0-20210923181911-321fe06c6dab/go.mod h1:DKI+t4Wj5YjkpxmiQhmG3qRG5VMOprDQvto62wMO68c=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927 h1:95mXJ5fUCYpBRdSOnLAQAdJHHKxxxJrVCiaqDi965YQ=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927/go.mod h1:vzuE21rowz+lT1NGsWbreIvYulgBpCGnQyeTyFblUHc=
 github.com/asticode/go-astikit v0.20.0 h1:+7N+J4E4lWx2QOkRdOf6DafWJMv6O4RRfgClwQokrH8=
diff --git a/internal/aac/adts.go b/internal/aac/adts.go
deleted file mode 100644
index e5cbac8b..00000000
--- a/internal/aac/adts.go
+++ /dev/null
@@ -1,166 +0,0 @@
-package aac
-
-import (
-	"fmt"
-)
-
-const (
-	mpegAudioTypeAACLLC = 2
-)
-
-var sampleRates = []int{
-	96000,
-	88200,
-	64000,
-	48000,
-	44100,
-	32000,
-	24000,
-	22050,
-	16000,
-	12000,
-	11025,
-	8000,
-	7350,
-}
-
-var channelCounts = []int{
-	1,
-	2,
-	3,
-	4,
-	5,
-	6,
-	8,
-}
-
-// ADTSPacket is an ADTS packet
-type ADTSPacket struct {
-	Type         int
-	SampleRate   int
-	ChannelCount int
-	AU           []byte
-}
-
-// DecodeADTS decodes an ADTS stream into ADTS packets.
-func DecodeADTS(byts []byte) ([]*ADTSPacket, error) {
-	// refs: https://wiki.multimedia.cx/index.php/ADTS
-
-	var ret []*ADTSPacket
-
-	for len(byts) > 0 {
-		syncWord := (uint16(byts[0]) << 4) | (uint16(byts[1]) >> 4)
-		if syncWord != 0xfff {
-			return nil, fmt.Errorf("invalid syncword")
-		}
-
-		protectionAbsent := byts[1] & 0x01
-		if protectionAbsent != 1 {
-			return nil, fmt.Errorf("CRC is not supported")
-		}
-
-		pkt := &ADTSPacket{}
-
-		pkt.Type = int((byts[2] >> 6) + 1)
-
-		switch pkt.Type {
-		case mpegAudioTypeAACLLC:
-
-		default:
-			return nil, fmt.Errorf("unsupported object type: %d", pkt.Type)
-		}
-
-		sampleRateIndex := (byts[2] >> 2) & 0x0F
-
-		switch {
-		case sampleRateIndex <= 12:
-			pkt.SampleRate = sampleRates[sampleRateIndex]
-
-		default:
-			return nil, fmt.Errorf("invalid sample rate index: %d", sampleRateIndex)
-		}
-
-		channelConfig := ((byts[2] & 0x01) << 2) | ((byts[3] >> 6) & 0x03)
-
-		switch {
-		case channelConfig >= 1 && channelConfig <= 7:
-			pkt.ChannelCount = channelCounts[channelConfig-1]
-
-		default:
-			return nil, fmt.Errorf("invalid channel configuration: %d", channelConfig)
-		}
-
-		frameLen := int(((uint16(byts[3])&0x03)<<11)|
-			(uint16(byts[4])<<3)|
-			((uint16(byts[5])>>5)&0x07)) - 7
-
-		// fullness := ((uint16(byts[5]) & 0x1F) << 6) | ((uint16(byts[6]) >> 2) & 0x3F)
-
-		frameCount := byts[6] & 0x03
-		if frameCount != 0 {
-			return nil, fmt.Errorf("multiple frame count not supported")
-		}
-
-		if len(byts[7:]) < frameLen {
-			return nil, fmt.Errorf("invalid frame length")
-		}
-
-		pkt.AU = byts[7 : 7+frameLen]
-		byts = byts[7+frameLen:]
-
-		ret = append(ret, pkt)
-	}
-
-	return ret, nil
-}
-
-// EncodeADTS encodes ADTS packets into an ADTS stream.
-func EncodeADTS(pkts []*ADTSPacket) ([]byte, error) {
-	var ret []byte
-
-	for _, pkt := range pkts {
-		sampleRateIndex := func() int {
-			for i, s := range sampleRates {
-				if s == pkt.SampleRate {
-					return i
-				}
-			}
-			return -1
-		}()
-
-		if sampleRateIndex == -1 {
-			return nil, fmt.Errorf("invalid sample rate: %d", pkt.SampleRate)
-		}
-
-		channelConfig := func() int {
-			for i, co := range channelCounts {
-				if co == pkt.ChannelCount {
-					return i + 1
-				}
-			}
-			return -1
-		}()
-
-		if channelConfig == -1 {
-			return nil, fmt.Errorf("invalid channel count: %d", pkt.ChannelCount)
-		}
-
-		frameLen := len(pkt.AU) + 7
-
-		fullness := 0x07FF // like ffmpeg does
-
-		header := make([]byte, 7)
-		header[0] = 0xFF
-		header[1] = 0xF1
-		header[2] = uint8(((pkt.Type - 1) << 6) | (sampleRateIndex << 2) | ((channelConfig >> 2) & 0x01))
-		header[3] = uint8((channelConfig&0x03)<<6 | (frameLen>>11)&0x03)
-		header[4] = uint8((frameLen >> 3) & 0xFF)
-		header[5] = uint8((frameLen&0x07)<<5 | ((fullness >> 6) & 0x1F))
-		header[6] = uint8((fullness & 0x3F) << 2)
-		ret = append(ret, header...)
-
-		ret = append(ret, pkt.AU...)
-	}
-
-	return ret, nil
-}
diff --git a/internal/aac/adts_test.go b/internal/aac/adts_test.go
deleted file mode 100644
index e942c2f1..00000000
--- a/internal/aac/adts_test.go
+++ /dev/null
@@ -1,68 +0,0 @@
-package aac
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-var casesADTS = []struct {
-	name string
-	byts []byte
-	pkts []*ADTSPacket
-}{
-	{
-		"single",
-		[]byte{0xff, 0xf1, 0x4c, 0x80, 0x1, 0x3f, 0xfc, 0xaa, 0xbb},
-		[]*ADTSPacket{
-			{
-				Type:         2,
-				SampleRate:   48000,
-				ChannelCount: 2,
-				AU:           []byte{0xaa, 0xbb},
-			},
-		},
-	},
-	{
-		"multiple",
-		[]byte{
-			0xff, 0xf1, 0x50, 0x40, 0x1, 0x3f, 0xfc, 0xaa,
-			0xbb, 0xff, 0xf1, 0x4c, 0x80, 0x1, 0x3f, 0xfc,
-			0xcc, 0xdd,
-		},
-		[]*ADTSPacket{
-			{
-				Type:         2,
-				SampleRate:   44100,
-				ChannelCount: 1,
-				AU:           []byte{0xaa, 0xbb},
-			},
-			{
-				Type:         2,
-				SampleRate:   48000,
-				ChannelCount: 2,
-				AU:           []byte{0xcc, 0xdd},
-			},
-		},
-	},
-}
-
-func TestDecodeADTS(t *testing.T) {
-	for _, ca := range casesADTS {
-		t.Run(ca.name, func(t *testing.T) {
-			pkts, err := DecodeADTS(ca.byts)
-			require.NoError(t, err)
-			require.Equal(t, ca.pkts, pkts)
-		})
-	}
-}
-
-func TestEncodeADTS(t *testing.T) {
-	for _, ca := range casesADTS {
-		t.Run(ca.name, func(t *testing.T) {
-			byts, err := EncodeADTS(ca.pkts)
-			require.NoError(t, err)
-			require.Equal(t, ca.byts, byts)
-		})
-	}
-}
diff --git a/internal/hls/client.go b/internal/hls/client.go
index 4349e49e..d05eb6e7 100644
--- a/internal/hls/client.go
+++ b/internal/hls/client.go
@@ -13,13 +13,13 @@ import (
 	"time"
 
 	"github.com/aler9/gortsplib"
+	"github.com/aler9/gortsplib/pkg/aac"
 	"github.com/aler9/gortsplib/pkg/h264"
 	"github.com/aler9/gortsplib/pkg/rtpaac"
 	"github.com/aler9/gortsplib/pkg/rtph264"
 	"github.com/asticode/go-astits"
 	"github.com/grafov/m3u8"
 
-	"github.com/aler9/rtsp-simple-server/internal/aac"
 	"github.com/aler9/rtsp-simple-server/internal/logger"
 )
 
diff --git a/internal/hls/muxer_ts_generator.go b/internal/hls/muxer_ts_generator.go
index 946eafcd..36dcabef 100644
--- a/internal/hls/muxer_ts_generator.go
+++ b/internal/hls/muxer_ts_generator.go
@@ -5,10 +5,9 @@ import (
 	"time"
 
 	"github.com/aler9/gortsplib"
+	"github.com/aler9/gortsplib/pkg/aac"
 	"github.com/aler9/gortsplib/pkg/h264"
 	"github.com/asticode/go-astits"
-
-	"github.com/aler9/rtsp-simple-server/internal/aac"
 )
 
 const (
diff --git a/internal/rtmp/metadata.go b/internal/rtmp/metadata.go
index f4838868..09127677 100644
--- a/internal/rtmp/metadata.go
+++ b/internal/rtmp/metadata.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 
 	"github.com/aler9/gortsplib"
-	"github.com/aler9/gortsplib/pkg/rtpaac"
+	"github.com/aler9/gortsplib/pkg/aac"
 	"github.com/notedit/rtmp/av"
 	nh264 "github.com/notedit/rtmp/codec/h264"
 	"github.com/notedit/rtmp/format/flv/flvio"
@@ -146,7 +146,7 @@ func (c *Conn) ReadMetadata() (*gortsplib.Track, *gortsplib.Track, error) {
 				return nil, nil, fmt.Errorf("audio track setupped twice")
 			}
 
-			var mpegConf rtpaac.MPEG4AudioConfig
+			var mpegConf aac.MPEG4AudioConfig
 			err := mpegConf.Decode(pkt.Data)
 			if err != nil {
 				return nil, nil, err
@@ -241,8 +241,8 @@ func (c *Conn) WriteMetadata(videoTrack *gortsplib.Track, audioTrack *gortsplib.
 			return err
 		}
 
-		enc, err := rtpaac.MPEG4AudioConfig{
-			Type:              rtpaac.MPEG4AudioType(conf.Type),
+		enc, err := aac.MPEG4AudioConfig{
+			Type:              aac.MPEG4AudioType(conf.Type),
 			SampleRate:        conf.SampleRate,
 			ChannelCount:      conf.ChannelCount,
 			AOTSpecificConfig: conf.AOTSpecificConfig,