diff --git a/container/mts/encoder.go b/container/mts/encoder.go
index a50c2615..fbcd4cc6 100644
--- a/container/mts/encoder.go
+++ b/container/mts/encoder.go
@@ -303,12 +303,12 @@ func (e *Encoder) tick() {
 
 // pts retuns the current presentation timestamp.
 func (e *Encoder) pts() uint64 {
-	return uint64((e.clock + e.ptsOffset).Seconds() * PTSFreq)
+	return uint64((e.clock + e.ptsOffset).Seconds() * PTSFrequency)
 }
 
 // pcr returns the current program clock reference.
 func (e *Encoder) pcr() uint64 {
-	return uint64(e.clock.Seconds() * PCRFreq)
+	return uint64(e.clock.Seconds() * PCRFrequency)
 }
 
 // ccFor returns the next continuity counter for pid.
diff --git a/container/mts/mpegts.go b/container/mts/mpegts.go
index f5fae7dc..3145dab9 100644
--- a/container/mts/mpegts.go
+++ b/container/mts/mpegts.go
@@ -318,9 +318,9 @@ func DiscontinuityIndicator(f bool) Option {
 }
 
 // GetPTSRange retreives the first and last PTS of an MPEGTS clip.
-func GetPTSRange(clip []byte, pidType int) (pts [2]uint64, err error) {
+func GetPTSRange(clip []byte, pidType uint16) (pts [2]uint64, err error) {
 	// Find the first packet with PID pidType.
-	pkt, _, err := FindPid(clip, uint16(pidType))
+	pkt, _, err := FindPid(clip, pidType)
 	if err != nil {
 		return [2]uint64{}, err
 	}
@@ -344,7 +344,7 @@ func GetPTSRange(clip []byte, pidType int) (pts [2]uint64, err error) {
 	// Get the final PTS searching from end of clip for access unit start.
 	for i := len(clip) - PacketSize; i >= 0; i -= PacketSize {
 		copy(_pkt[:], clip[i:i+PacketSize])
-		if packet.PayloadUnitStartIndicator(&_pkt) && _pkt.PID() == pidType {
+		if packet.PayloadUnitStartIndicator(&_pkt) && uint16(_pkt.PID()) == pidType {
 			payload, err = packet.Payload(&_pkt)
 			if err != nil {
 				return [2]uint64{}, err