diff --git a/tsMuxer/hevc.h b/tsMuxer/hevc.h
index 8039b07..40a6ad2 100644
--- a/tsMuxer/hevc.h
+++ b/tsMuxer/hevc.h
@@ -49,7 +49,7 @@ struct HevcUnit
     };
 
     void decodeBuffer(const uint8_t* buffer, const uint8_t* end);
-    virtual int deserialize();
+    int deserialize();
     int serializeBuffer(uint8_t* dstBuffer, uint8_t* dstEnd) const;
 
     int nalBufferLen() const { return m_nalBufferLen; }
@@ -87,7 +87,7 @@ struct HevcUnitWithProfile : public HevcUnit
 struct HevcVpsUnit : public HevcUnitWithProfile
 {
     HevcVpsUnit();
-    int deserialize() override;
+    int deserialize();
     double getFPS() const;
     void setFPS(double value);
     std::string getDescription() const;
@@ -102,7 +102,7 @@ struct HevcVpsUnit : public HevcUnitWithProfile
 struct HevcSpsUnit : public HevcUnitWithProfile
 {
     HevcSpsUnit();
-    int deserialize() override;
+    int deserialize();
     double getFPS() const;
     std::string getDescription() const;
 
@@ -145,7 +145,7 @@ struct HevcSpsUnit : public HevcUnitWithProfile
 struct HevcPpsUnit : public HevcUnit
 {
     HevcPpsUnit();
-    int deserialize() override;
+    int deserialize();
 
    public:
     unsigned pps_id;
@@ -158,7 +158,7 @@ struct HevcPpsUnit : public HevcUnit
 struct HevcHdrUnit : public HevcUnit
 {
     HevcHdrUnit();
-    int deserialize() override;
+    int deserialize();
 
    public:
     bool isHDR10;
diff --git a/tsMuxer/movDemuxer.cpp b/tsMuxer/movDemuxer.cpp
index 4e5d1bd..bd34683 100644
--- a/tsMuxer/movDemuxer.cpp
+++ b/tsMuxer/movDemuxer.cpp
@@ -242,7 +242,7 @@ class MovParsedH264TrackData : public ParsedTrackPrivData
 {
    public:
     MovParsedH264TrackData(MovDemuxer* demuxer, MOVStreamContext* sc)
-        : ParsedTrackPrivData(), m_demuxer(demuxer), m_sc(sc), nal_length_size(4)
+        : ParsedTrackPrivData(), m_sc(sc), m_demuxer(demuxer), nal_length_size(4)
     {
     }
     void setPrivData(uint8_t* buff, int size) override
diff --git a/tsMuxer/nalUnits.h b/tsMuxer/nalUnits.h
index 3463413..f4d3ce4 100644
--- a/tsMuxer/nalUnits.h
+++ b/tsMuxer/nalUnits.h
@@ -81,9 +81,9 @@ class NALUnit
     static int decodeNAL(const uint8_t* srcBuffer, const uint8_t* srcEnd, uint8_t* dstBuffer, size_t dstBufferSize);
     int decodeNAL2(uint8_t* srcBuffer, uint8_t* srcEnd, uint8_t* dstBuffer, size_t dstBufferSize,
                    bool* keepSrcBuffer);  // do not copy buffer if nothink to decode
-    virtual int deserialize(uint8_t* buffer, uint8_t* end);
+    int deserialize(uint8_t* buffer, uint8_t* end);
     virtual int serializeBuffer(uint8_t* dstBuffer, uint8_t* dstEnd, bool writeStartCode) const;
-    virtual int serialize(uint8_t* dstBuffer);
+    int serialize(uint8_t* dstBuffer);
     // void setBuffer(uint8_t* buffer, uint8_t* end);
     void decodeBuffer(const uint8_t* buffer, const uint8_t* end);
     static uint8_t* addStartCode(uint8_t* buffer, uint8_t* boundStart);
@@ -119,8 +119,8 @@ class NALDelimiter : public NALUnit
     const static int PCT_I_SI_P_SP_B_FRAMES = 7;
     int primary_pic_type;
     NALDelimiter() : NALUnit(), primary_pic_type(0) {}
-    int deserialize(uint8_t* buffer, uint8_t* end) override;
-    int serialize(uint8_t* dstBuffer) override;
+    int deserialize(uint8_t* buffer, uint8_t* end);
+    int serialize(uint8_t* dstBuffer);
 };
 
 class PPSUnit : public NALUnit
diff --git a/tsMuxer/vvc.h b/tsMuxer/vvc.h
index 748dedc..daa01b6 100644
--- a/tsMuxer/vvc.h
+++ b/tsMuxer/vvc.h
@@ -50,7 +50,7 @@ struct VvcUnit
     };
 
     void decodeBuffer(const uint8_t* buffer, const uint8_t* end);
-    virtual int deserialize();
+    int deserialize();
     int serializeBuffer(uint8_t* dstBuffer, uint8_t* dstEnd) const;
 
     int nalBufferLen() const { return m_nalBufferLen; }
@@ -95,7 +95,7 @@ struct VvcUnitWithProfile : public VvcUnit
 struct VvcVpsUnit : public VvcUnitWithProfile
 {
     VvcVpsUnit();
-    int deserialize() override;
+    int deserialize();
     double getFPS() const;
     void setFPS(double value);
     std::string getDescription() const;
@@ -113,7 +113,7 @@ struct VvcVpsUnit : public VvcUnitWithProfile
 struct VvcSpsUnit : public VvcUnitWithProfile
 {
     VvcSpsUnit();
-    int deserialize() override;
+    int deserialize();
     double getFPS() const;
     std::string getDescription() const;
 
@@ -152,7 +152,7 @@ struct VvcSpsUnit : public VvcUnitWithProfile
 struct VvcPpsUnit : public VvcUnit
 {
     VvcPpsUnit();
-    int deserialize() override;
+    int deserialize();
 
    public:
     int pps_id;