diff --git a/mkvparser.cpp b/mkvparser.cpp
index b2f04ab..0b46694 100644
--- a/mkvparser.cpp
+++ b/mkvparser.cpp
@@ -19,7 +19,6 @@ mkvparser::IMkvReader::~IMkvReader()
 {
 }
 
-
 void mkvparser::GetVersion(int& major, int& minor, int& build, int& revision)
 {
     major = 1;
@@ -28,7 +27,6 @@ void mkvparser::GetVersion(int& major, int& minor, int& build, int& revision)
     revision = 7;
 }
 
-
 long long mkvparser::ReadUInt(IMkvReader* pReader, long long pos, long& len)
 {
     assert(pReader);
@@ -235,6 +233,7 @@ long long mkvparser::UnserializeUInt(
 
         if (hr < 0)
             return hr;
+
         result <<= 8;
         result |= b;
 
@@ -366,7 +365,6 @@ bool mkvparser::Match(
     long long& pos,
     unsigned long id_,
     long long& val)
-
 {
     assert(pReader);
     assert(pos >= 0);
@@ -2984,13 +2982,12 @@ Track::~Track()
 Track::Info::Info():
     type(-1),
     number(-1),
-    uid(-1),
+    uid(ULLONG_MAX),
     nameAsUTF8(NULL),
     codecId(NULL),
     codecPrivate(NULL),
     codecPrivateSize(0),
     codecNameAsUTF8(NULL)
-    //lacing(false)
 {
 }
 
@@ -3027,6 +3024,11 @@ long long Track::GetNumber() const
     return m_info.number;
 }
 
+unsigned long long Track::GetUid() const
+{
+    return m_info.uid;
+}
+
 const char* Track::GetNameAsUTF8() const
 {
     return m_info.nameAsUTF8;
@@ -3530,8 +3532,8 @@ void Tracks::ParseTrackEntry(
 #endif
         if (Match(pReader, pos, 0x57, i.number))
             assert(i.number > 0);
-        else if (Match(pReader, pos, 0x33C5, i.uid))
-            ;
+        //else if (Match(pReader, pos, 0x33C5, i.uid))
+        //    ;
         else if (Match(pReader, pos, 0x03, i.type))
             ;
         else if (Match(pReader, pos, 0x136E, i.nameAsUTF8))
@@ -3552,6 +3554,9 @@ void Tracks::ParseTrackEntry(
         {
             long len;
 
+            const long long idpos = pos;
+            idpos;
+
             const long long id = ReadUInt(pReader, pos, len);
             assert(id >= 0);  //TODO: handle error case
             assert((pos + len) <= stop);
@@ -3578,6 +3583,27 @@ void Tracks::ParseTrackEntry(
                 audioSettings.start = start;
                 audioSettings.size = size;
             }
+            else if (id == 0x33C5)  //Track UID
+            {
+                assert(size <= 8);
+
+                i.uid = 0;
+                long long pos_ = start;
+                const long long pos_end = start + size;
+
+                while (pos_ != pos_end)
+                {
+                    unsigned char b;
+
+                    const long status = pReader->Read(pos_, 1, &b);
+                    assert(status == 0);
+
+                    i.uid <<= 8;
+                    i.uid |= b;
+
+                    ++pos_;
+                }
+            }
         }
     }
 
diff --git a/mkvparser.hpp b/mkvparser.hpp
index a2ac71b..8bc417f 100644
--- a/mkvparser.hpp
+++ b/mkvparser.hpp
@@ -37,7 +37,7 @@ short Unserialize2SInt(IMkvReader*, long long);
 signed char Unserialize1SInt(IMkvReader*, long long);
 bool Match(IMkvReader*, long long&, unsigned long, long long&);
 bool Match(IMkvReader*, long long&, unsigned long, char*&);
-bool Match(IMkvReader*, long long&, unsigned long,unsigned char*&, size_t&);
+bool Match(IMkvReader*, long long&, unsigned long, unsigned char*&, size_t&);
 bool Match(IMkvReader*, long long&, unsigned long, double&);
 bool Match(IMkvReader*, long long&, unsigned long, short&);
 
@@ -209,6 +209,7 @@ public:
 
     long long GetType() const;
     long long GetNumber() const;
+    unsigned long long GetUid() const;
     const char* GetNameAsUTF8() const;
     const char* GetCodecNameAsUTF8() const;
     const char* GetCodecId() const;
@@ -227,7 +228,7 @@ public:
     {
         long long type;
         long long number;
-        long long uid;
+        unsigned long long uid;
         char* nameAsUTF8;
         char* codecId;
         unsigned char* codecPrivate;
diff --git a/sample.cpp b/sample.cpp
index 61f40ba..03daab8 100644
--- a/sample.cpp
+++ b/sample.cpp
@@ -148,14 +148,14 @@ int main(int argc, char* argv[])
         if (pTrack == NULL)
             continue;
 
-        const long long trackType_ = pTrack->GetType();
-        unsigned long trackType = static_cast<unsigned long>(trackType_);
-
-        unsigned long trackNumber = pTrack->GetNumber();
+        const long long trackType = pTrack->GetType();
+        const long long trackNumber = pTrack->GetNumber();
+        const unsigned long long trackUid = pTrack->GetUid();
         const wchar_t* const pTrackName = utf8towcs(pTrack->GetNameAsUTF8());
 
         printf("\t\tTrack Type\t\t: %ld\n", trackType);
         printf("\t\tTrack Number\t\t: %ld\n", trackNumber);
+        printf("\t\tTrack Uid\t\t: %lld\n", trackUid);
 
         if (pTrackName == NULL)
             printf("\t\tTrack Name\t\t: NULL\n");
@@ -235,8 +235,9 @@ int main(int argc, char* argv[])
         while ((pBlockEntry != NULL) && !pBlockEntry->EOS())
         {
             const Block* const pBlock  = pBlockEntry->GetBlock();
-            const unsigned long trackNum = pBlock->GetTrackNumber();
-            const Track* const pTrack = pTracks->GetTrackByNumber(trackNum);
+            const long long trackNum = pBlock->GetTrackNumber();
+            const unsigned long tn = static_cast<unsigned long>(trackNum);
+            const Track* const pTrack = pTracks->GetTrackByNumber(tn);
             const long long trackType = pTrack->GetType();
             const int frameCount = pBlock->GetFrameCount();
             const long long time_ns = pBlock->GetTime(pCluster);
@@ -250,7 +251,7 @@ int main(int argc, char* argv[])
             {
                 const Block::Frame& theFrame = pBlock->GetFrame(i);
                 const long size = theFrame.len;
-                const long offset = theFrame.pos;
+                const long long offset = theFrame.pos;
                 printf("\t\t\t %15ld,%15lx\n", size, offset);
             }