diff --git a/track_aac.go b/track_aac.go
index 75e3d240..a371ae00 100644
--- a/track_aac.go
+++ b/track_aac.go
@@ -37,10 +37,12 @@ func NewTrackAAC(payloadType uint8, typ int, sampleRate int,
 	}
 
 	return &TrackAAC{
-		payloadType:  payloadType,
-		sampleRate:   sampleRate,
-		channelCount: channelCount,
-		mpegConf:     mpegConf,
+		payloadType:       payloadType,
+		typ:               typ,
+		sampleRate:        sampleRate,
+		channelCount:      channelCount,
+		aotSpecificConfig: aotSpecificConfig,
+		mpegConf:          mpegConf,
 	}, nil
 }
 
diff --git a/track_aac_test.go b/track_aac_test.go
index 2cd0a8a3..6d97342b 100644
--- a/track_aac_test.go
+++ b/track_aac_test.go
@@ -8,8 +8,12 @@ import (
 )
 
 func TestTrackAACNew(t *testing.T) {
-	_, err := NewTrackAAC(96, 2, 48000, 2, nil)
+	track, err := NewTrackAAC(96, 2, 48000, 4, []byte{0x01, 0x02})
 	require.NoError(t, err)
+	require.Equal(t, 2, track.typ)
+	require.Equal(t, 48000, track.sampleRate)
+	require.Equal(t, 4, track.channelCount)
+	require.Equal(t, []byte{0x01, 0x02}, track.aotSpecificConfig)
 }
 
 func TestTrackAACNewFromMediaDescription(t *testing.T) {
@@ -39,6 +43,7 @@ func TestTrackAACNewFromMediaDescription(t *testing.T) {
 			},
 			&TrackAAC{
 				payloadType:  96,
+				typ:          2,
 				sampleRate:   48000,
 				channelCount: 2,
 				mpegConf:     []byte{0x11, 0x90},
@@ -65,6 +70,7 @@ func TestTrackAACNewFromMediaDescription(t *testing.T) {
 			},
 			&TrackAAC{
 				payloadType:  96,
+				typ:          2,
 				sampleRate:   48000,
 				channelCount: 2,
 				mpegConf:     []byte{0x11, 0x90},
diff --git a/track_h264_test.go b/track_h264_test.go
index d16274ff..8a5d1628 100644
--- a/track_h264_test.go
+++ b/track_h264_test.go
@@ -165,19 +165,12 @@ func TestTrackH264GetSPSPPSErrors(t *testing.T) {
 }
 
 func TestTrackH264New(t *testing.T) {
-	_, err := NewTrackH264(96,
-		[]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,
-		},
-		[]byte{
-			0x01, 0x02,
-		})
+	track, err := NewTrackH264(96,
+		[]byte{0x01, 0x02}, []byte{0x03, 0x04}, []byte{0x05, 0x06})
 	require.NoError(t, err)
+	require.Equal(t, []byte{0x01, 0x02}, track.sps)
+	require.Equal(t, []byte{0x03, 0x04}, track.pps)
+	require.Equal(t, []byte{0x05, 0x06}, track.extradata)
 }
 
 func TestTrackH264NewFromMediaDescription(t *testing.T) {
diff --git a/track_opus_test.go b/track_opus_test.go
index 653cc4f2..f3932615 100644
--- a/track_opus_test.go
+++ b/track_opus_test.go
@@ -8,8 +8,10 @@ import (
 )
 
 func TestTrackOpusNew(t *testing.T) {
-	_, err := NewTrackOpus(96, 48000, 2)
+	track, err := NewTrackOpus(96, 48000, 2)
 	require.NoError(t, err)
+	require.Equal(t, 48000, track.sampleRate)
+	require.Equal(t, 2, track.channelCount)
 }
 
 func TestTrackOpusNewFromMediaDescription(t *testing.T) {
diff --git a/track_test.go b/track_test.go
index aa34e42c..6d07945f 100644
--- a/track_test.go
+++ b/track_test.go
@@ -51,6 +51,7 @@ func TestTrackNewFromMediaDescription(t *testing.T) {
 			},
 			&TrackAAC{
 				payloadType:  96,
+				typ:          2,
 				sampleRate:   48000,
 				channelCount: 2,
 				mpegConf:     []byte{0x11, 0x90},
@@ -77,6 +78,7 @@ func TestTrackNewFromMediaDescription(t *testing.T) {
 			},
 			&TrackAAC{
 				payloadType:  96,
+				typ:          2,
 				sampleRate:   48000,
 				channelCount: 2,
 				mpegConf:     []byte{0x11, 0x90},