diff --git a/pkg/formats/format_test.go b/pkg/formats/format_test.go
index 9299af52..02997e4d 100644
--- a/pkg/formats/format_test.go
+++ b/pkg/formats/format_test.go
@@ -134,6 +134,7 @@ var casesFormat = []struct {
 		96,
 		"mpeg4-generic/48000/2",
 		map[string]string{
+			"streamtype":       "5",
 			"profile-level-id": "1",
 			"mode":             "AAC-hbr",
 			"sizelength":       "13",
@@ -142,7 +143,8 @@ var casesFormat = []struct {
 			"config":           "11900810",
 		},
 		&MPEG4Audio{
-			PayloadTyp: 96,
+			PayloadTyp:     96,
+			ProfileLevelID: 1,
 			Config: &mpeg4audio.Config{
 				Type:         mpeg4audio.ObjectTypeAACLC,
 				SampleRate:   48000,
@@ -154,6 +156,7 @@ var casesFormat = []struct {
 		},
 		"mpeg4-generic/48000/2",
 		map[string]string{
+			"streamtype":       "5",
 			"profile-level-id": "1",
 			"mode":             "AAC-hbr",
 			"sizelength":       "13",
@@ -176,7 +179,8 @@ var casesFormat = []struct {
 			"config":           "1190",
 		},
 		&MPEG4Audio{
-			PayloadTyp: 96,
+			PayloadTyp:     96,
+			ProfileLevelID: 1,
 			Config: &mpeg4audio.Config{
 				Type:         mpeg4audio.ObjectTypeAACLC,
 				SampleRate:   48000,
@@ -188,6 +192,7 @@ var casesFormat = []struct {
 		},
 		"mpeg4-generic/48000/2",
 		map[string]string{
+			"streamtype":       "5",
 			"profile-level-id": "1",
 			"mode":             "AAC-hbr",
 			"sizelength":       "13",
@@ -202,14 +207,15 @@ var casesFormat = []struct {
 		96,
 		"mpeg4-generic/48000/2",
 		map[string]string{
-			"streamtype":       "3",
+			"streamtype":       "5",
 			"profile-level-id": "14",
 			"mode":             "AAC-hbr",
 			"config":           "1190",
 			"sizelength":       "13",
 		},
 		&MPEG4Audio{
-			PayloadTyp: 96,
+			PayloadTyp:     96,
+			ProfileLevelID: 14,
 			Config: &mpeg4audio.Config{
 				Type:         mpeg4audio.ObjectTypeAACLC,
 				SampleRate:   48000,
@@ -219,7 +225,8 @@ var casesFormat = []struct {
 		},
 		"mpeg4-generic/48000/2",
 		map[string]string{
-			"profile-level-id": "1",
+			"streamtype":       "5",
+			"profile-level-id": "14",
 			"mode":             "AAC-hbr",
 			"config":           "1190",
 			"sizelength":       "13",
@@ -646,6 +653,64 @@ func TestMarshal(t *testing.T) {
 	}
 }
 
+func TestUnmarshalMPEG4AudioGenericErrors(t *testing.T) {
+	_, err := Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"streamtype": "10",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"mode": "asd",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"profile-level-id": "aaa",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"config": "aaa",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"config": "0ab2",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"sizelength": "aaa",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"indexlength": "aaa",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"indexdeltalength": "aaa",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"profile-level-id": "1",
+		"sizelength":       "13",
+		"indexlength":      "3",
+		"indexdeltalength": "3",
+	})
+	require.Error(t, err)
+
+	_, err = Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
+		"profile-level-id": "1",
+		"config":           "1190",
+		"indexlength":      "3",
+		"indexdeltalength": "3",
+	})
+	require.Error(t, err)
+}
+
 func FuzzUnmarshalH264(f *testing.F) {
 	f.Fuzz(func(t *testing.T, sps string, pktMode string) {
 		Unmarshal("video", 96, "H264/90000", map[string]string{
@@ -672,17 +737,6 @@ func FuzzUnmarshalLPCM(f *testing.F) {
 	})
 }
 
-func FuzzUnmarshalMPEG4AudioGeneric(f *testing.F) {
-	f.Fuzz(func(t *testing.T, a, b, c, d string) {
-		Unmarshal("audio", 96, "MPEG4-generic/48000/2", map[string]string{
-			"config":           a,
-			"sizelength":       b,
-			"indexlength":      c,
-			"indexdeltalength": d,
-		})
-	})
-}
-
 func FuzzUnmarshalMPEG4AudioLATM(f *testing.F) {
 	f.Fuzz(func(t *testing.T, a, b, c, d, e, f string) {
 		Unmarshal("audio", 96, "MP4A-LATM/48000/2", map[string]string{
diff --git a/pkg/formats/mpeg4_audio_generic.go b/pkg/formats/mpeg4_audio_generic.go
index ad5b6f72..4ddcb52e 100644
--- a/pkg/formats/mpeg4_audio_generic.go
+++ b/pkg/formats/mpeg4_audio_generic.go
@@ -4,6 +4,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/pion/rtp"
 
@@ -18,6 +19,7 @@ type MPEG4Audio = MPEG4AudioGeneric
 // Specification: https://datatracker.ietf.org/doc/html/rfc3640
 type MPEG4AudioGeneric struct {
 	PayloadTyp       uint8
+	ProfileLevelID   int
 	Config           *mpeg4audio.Config
 	SizeLength       int
 	IndexLength      int
@@ -47,6 +49,24 @@ func (f *MPEG4AudioGeneric) unmarshal(
 
 	for key, val := range fmtp {
 		switch key {
+		case "streamtype":
+			if val != "5" { // AudioStream in ISO 14496-1
+				return fmt.Errorf("streamtype of AAC must be 5")
+			}
+
+		case "mode":
+			if strings.ToLower(val) != "aac-hbr" {
+				return fmt.Errorf("unsupported AAC mode: %v", val)
+			}
+
+		case "profile-level-id":
+			tmp, err := strconv.ParseInt(val, 10, 64)
+			if err != nil {
+				return fmt.Errorf("invalid profile-level-id: %v", val)
+			}
+
+			f.ProfileLevelID = int(tmp)
+
 		case "config":
 			enc, err := hex.DecodeString(val)
 			if err != nil {
@@ -105,9 +125,15 @@ func (f *MPEG4AudioGeneric) Marshal() (string, map[string]string) {
 		sampleRate = f.Config.ExtensionSampleRate
 	}
 
+	profileLevelID := f.ProfileLevelID
+	if profileLevelID == 0 { // support legacy definition which didn't include profile-level-id
+		profileLevelID = 1
+	}
+
 	fmtp := map[string]string{
-		"profile-level-id": "1",
+		"streamtype":       "5",
 		"mode":             "AAC-hbr",
+		"profile-level-id": strconv.FormatInt(int64(profileLevelID), 10),
 	}
 
 	if f.SizeLength > 0 {
diff --git a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/2898e764696b0420 b/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/2898e764696b0420
deleted file mode 100644
index 9c70a86d..00000000
--- a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/2898e764696b0420
+++ /dev/null
@@ -1,5 +0,0 @@
-go test fuzz v1
-string("0")
-string("\xc9u\xb9")
-string("\x94\xe3ȿJ\xcai\xd5\xee\xc0\xff\xff\x00\x00O\x96a\xdb\x04\x01y\xc8@")
-string("d\x00\x00\x00")
diff --git a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/47164857eaf9f343 b/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/47164857eaf9f343
deleted file mode 100644
index e5ce1e0f..00000000
--- a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/47164857eaf9f343
+++ /dev/null
@@ -1,5 +0,0 @@
-go test fuzz v1
-string("0")
-string("")
-string("")
-string("0")
diff --git a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/6775f71697eec2db b/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/6775f71697eec2db
deleted file mode 100644
index ceca43c3..00000000
--- a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/6775f71697eec2db
+++ /dev/null
@@ -1,5 +0,0 @@
-go test fuzz v1
-string("")
-string("")
-string("")
-string("0")
diff --git a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/76b36b8b3c310afb b/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/76b36b8b3c310afb
deleted file mode 100644
index 8d6f0d54..00000000
--- a/pkg/formats/testdata/fuzz/FuzzUnmarshalMPEG4AudioGeneric/76b36b8b3c310afb
+++ /dev/null
@@ -1,5 +0,0 @@
-go test fuzz v1
-string("")
-string("\f3r\x05\x00\xe7\xe8")
-string("2\xf5\xe13")
-string("7")