diff --git a/container/mts/encoder_test.go b/container/mts/encoder_test.go
index 24fb823d..4443e8e8 100644
--- a/container/mts/encoder_test.go
+++ b/container/mts/encoder_test.go
@@ -197,7 +197,7 @@ func TestEncodePcm(t *testing.T) {
 	for i+PacketSize <= len(clip) {
 
 		// Check MTS packet
-		if !(pkt.PID() == audioPid) {
+		if !(pkt.PID() == AudioPid) {
 			i += PacketSize
 			if i+PacketSize <= len(clip) {
 				copy(pkt[:], clip[i:i+PacketSize])
diff --git a/container/mts/mpegts_test.go b/container/mts/mpegts_test.go
index 4c90cc0e..511a9eb1 100644
--- a/container/mts/mpegts_test.go
+++ b/container/mts/mpegts_test.go
@@ -79,7 +79,7 @@ func TestGetPTSRange(t *testing.T) {
 		curTime += interval
 	}
 
-	got, err := GetPTSRange(clip.Bytes(), videoPid)
+	got, err := GetPTSRange(clip.Bytes(), VideoPid)
 	if err != nil {
 		t.Fatalf("did not expect error getting PTS range: %v", err)
 	}
@@ -139,7 +139,7 @@ func writeFrame(b *bytes.Buffer, frame []byte, pts uint64) error {
 	for len(buf) != 0 {
 		pkt := Packet{
 			PUSI: pusi,
-			PID:  videoPid,
+			PID:  VideoPid,
 			RAI:  pusi,
 			CC:   0,
 			AFC:  hasAdaptationField | hasPayload,