diff --git a/codec/h264/h264dec/frame.go b/codec/h264/h264dec/frame.go
index 82b32ae5..ca85982b 100644
--- a/codec/h264/h264dec/frame.go
+++ b/codec/h264/h264dec/frame.go
@@ -9,7 +9,7 @@ const (
 	naluTypeSlicePartC
 	naluTypeSliceIDRPicture
 	naluTypeSEI
-	naluTypeSPS
+	NALTypeSPS
 	naluTypePPS
 	naluTypeAccessUnitDelimiter
 	naluTypeEndOfSequence
diff --git a/codec/h264/h264dec/read.go b/codec/h264/h264dec/read.go
index c98d46ca..9b283c92 100644
--- a/codec/h264/h264dec/read.go
+++ b/codec/h264/h264dec/read.go
@@ -61,7 +61,7 @@ func (h *H264Reader) Start() {
 		// TODO: need to handle error from this.
 		nalUnit, _, _ := h.readNalUnit()
 		switch nalUnit.Type {
-		case naluTypeSPS:
+		case NALTypeSPS:
 			// TODO: handle this error
 			sps, _ := NewSPS(nalUnit.RBSP, false)
 			h.VideoStreams = append(
diff --git a/container/mts/encoder.go b/container/mts/encoder.go
index 63413b77..cb3d9d06 100644
--- a/container/mts/encoder.go
+++ b/container/mts/encoder.go
@@ -33,6 +33,7 @@ import (
 	"time"
 
 	"bitbucket.org/ausocean/av/codec/h264"
+	"bitbucket.org/ausocean/av/codec/h264/h264dec"
 	"bitbucket.org/ausocean/av/container/mts/meta"
 	"bitbucket.org/ausocean/av/container/mts/pes"
 	"bitbucket.org/ausocean/av/container/mts/psi"
@@ -252,11 +253,7 @@ func (e *Encoder) Write(data []byte) (int, error) {
 			return 0, fmt.Errorf("could not get type from NAL unit, failed with error: %v", err)
 		}
 
-		// NAL type that will signify refresh. These are defined in H.264 specifications
-		// table 7-1.
-		const nalTypeSPS = 7
-
-		if nalType == nalTypeSPS {
+		if nalType == h264dec.NALTypeSPS {
 			err := e.writePSI()
 			if err != nil {
 				return 0, err