diff --git a/lib/dtsc.h b/lib/dtsc.h
index de2780a6..2a401e1d 100644
--- a/lib/dtsc.h
+++ b/lib/dtsc.h
@@ -117,7 +117,7 @@ namespace DTSC {
       packType getVersion() const;
       void reInit(Socket::Connection & src);
       void reInit(const char * data_, unsigned int len, bool noCopy = false);
-      void genericFill(long long packTime, long long packOffset, long long packTrack, const char * packData, long long packDataSize, long long packBytePos, bool isKeyframe);
+      void genericFill(long long packTime, long long packOffset, long long packTrack, const char * packData, long long packDataSize, uint64_t packBytePos, bool isKeyframe);
       void getString(const char * identifier, char *& result, unsigned int & len) const;
       void getString(const char * identifier, std::string & result) const;
       void getInt(const char * identifier, int & result) const;
@@ -282,9 +282,9 @@ namespace DTSC {
         return (parts.size() && keySizes.size() && (keySizes.size() == keys.size()));
       }
       /*
-      void update(long long packTime, long long packOffset, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size = 5000);
+      void update(long long packTime, long long packOffset, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size = 5000);
       */
-      void update(long long packTime, long long packOffset, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size = 5000, const char * iVec = 0);
+      void update(long long packTime, long long packOffset, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size = 5000, const char * iVec = 0);
       int getSendLen(bool skipDynamic = false);
       void send(Socket::Connection & conn, bool skipDynamic = false);
       void writeTo(char *& p);
@@ -297,7 +297,7 @@ namespace DTSC {
       Key & getKey(unsigned int keyNum);
       Fragment & getFrag(unsigned int fragNum);
       unsigned int timeToKeynum(unsigned int timestamp);
-      unsigned int timeToFragnum(unsigned int timestamp);
+      uint32_t timeToFragnum(uint64_t timestamp);
       void reset();
       void toPrettyString(std::ostream & str, int indent = 0, int verbosity = 0);
       void finalize();
@@ -342,12 +342,12 @@ namespace DTSC {
       }
       void reinit(const DTSC::Packet & source);
       void update(DTSC::Packet & pack, unsigned long segment_size = 5000);
-      void updatePosOverride(DTSC::Packet & pack, unsigned long bpos);
+      void updatePosOverride(DTSC::Packet & pack, uint64_t bpos);
       void update(JSON::Value & pack, unsigned long segment_size = 5000);
       /*LTS
-      void update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize = 0, unsigned long segment_size = 5000);
+      void update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize = 0, unsigned long segment_size = 5000);
       LTS*/
-      void update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize = 0, unsigned long segment_size = 5000, const char * iVec = 0);
+      void update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize = 0, unsigned long segment_size = 5000, const char * iVec = 0);
       unsigned int getSendLen(bool skipDynamic = false, std::set<unsigned long> selectedTracks = std::set<unsigned long>());
       void send(Socket::Connection & conn, bool skipDynamic = false, std::set<unsigned long> selectedTracks = std::set<unsigned long>());
       void writeTo(char * p);
@@ -367,6 +367,22 @@ namespace DTSC {
       long long int bufferWindow;
   };
 
+  /// An iterator helper for easily iterating over the parts in a Fragment.
+  class PartIter {
+    public:
+      PartIter(Track & Trk, Fragment & frag);
+      Part & operator*() const;///< Dereferences into a Value reference.
+      Part* operator->() const;///< Dereferences into a Value reference.
+      operator bool() const;///< True if not done iterating.
+      PartIter & operator++();///<Go to next iteration.
+    private:
+      uint32_t lastKey;
+      uint32_t currInKey;
+      Track * tRef;
+      std::deque<Part>::iterator pIt;
+      std::deque<Key>::iterator kIt;
+  };
+
   /// A simple wrapper class that will open a file and allow easy reading/writing of DTSC data from/to it.
   class File {
     public:
diff --git a/lib/dtscmeta.cpp b/lib/dtscmeta.cpp
index d4956d2e..2cb67fb9 100644
--- a/lib/dtscmeta.cpp
+++ b/lib/dtscmeta.cpp
@@ -208,7 +208,7 @@ namespace DTSC {
   
   /// Re-initializes this Packet to contain a generic DTSC packet with the given data fields.
   /// When given a NULL pointer, the data is reserved and memset to 0
-  void Packet::genericFill(long long packTime, long long packOffset, long long packTrack, const char * packData, long long packDataSize, long long packBytePos, bool isKeyframe){
+  void Packet::genericFill(long long packTime, long long packOffset, long long packTrack, const char * packData, long long packDataSize, uint64_t packBytePos, bool isKeyframe){
     null();
     master = true;
     //time and trackID are part of the 20-byte header.
@@ -1167,9 +1167,9 @@ namespace DTSC {
   ///\brief Updates a track and its metadata given new packet properties.
   ///Will also insert keyframes on non-video tracks, and creates fragments
   /*LTS
-  void Track::update(long long packTime, long long packOffset, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size) {
+  void Track::update(long long packTime, long long packOffset, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size) {
   LTS*/
-  void Track::update(long long packTime, long long packOffset, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size, const char * iVec) {
+  void Track::update(long long packTime, long long packOffset, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size, const char * iVec) {
     if ((unsigned long long)packTime < lastms) {
       static bool warned = false;
       if (!warned){
@@ -1298,7 +1298,7 @@ namespace DTSC {
   ///\brief Returns a key given its number, or an empty key if the number is out of bounds
   Key & Track::getKey(unsigned int keyNum) {
     static Key empty;
-    if (keyNum < keys[0].getNumber()) {
+    if (!keys.size() || keyNum < keys[0].getNumber()) {
       return empty;
     }
     if ((keyNum - keys[0].getNumber()) > keys.size()) {
@@ -1320,11 +1320,13 @@ namespace DTSC {
   }
 
   /// Gets indice of the fragment containing timestamp, or last fragment if nowhere.
-  unsigned int Track::timeToFragnum(unsigned int timestamp){
-    for (unsigned int i = 0; i<fragments.size(); i++){
-      if (timestamp <= getKey(fragments[i].getNumber()).getTime() + fragments[i].getDuration()){
+  uint32_t Track::timeToFragnum(uint64_t timestamp){
+    uint32_t i = 0;
+    for (std::deque<Fragment>::iterator it = fragments.begin(); it != fragments.end(); ++it){
+      if (timestamp < getKey(it->getNumber()).getTime() + it->getDuration()){
         return i;
       }
+      ++i;
     }
     return fragments.size()-1;
   }
@@ -1404,9 +1406,9 @@ namespace DTSC {
   ///\brief Updates a meta object given a JSON::Value
   void Meta::update(JSON::Value & pack, unsigned long segment_size) {
     /*LTS
-    update(pack["time"].asInt(), pack.isMember("offset")?pack["offset"].asInt():0, pack["trackid"].asInt(), pack["data"].asStringRef().size(), pack.isMember("bpos")?pack["bpos"].asInt():-1, pack.isMember("keyframe"), pack.packedSize(), segment_size);
+    update(pack["time"].asInt(), pack.isMember("offset")?pack["offset"].asInt():0, pack["trackid"].asInt(), pack["data"].asStringRef().size(), pack.isMember("bpos")?pack["bpos"].asInt():0, pack.isMember("keyframe"), pack.packedSize(), segment_size);
     LTS*/
-    update(pack["time"].asInt(), pack.isMember("offset")?pack["offset"].asInt():0, pack["trackid"].asInt(), pack["data"].asStringRef().size(), pack.isMember("bpos")?pack["bpos"].asInt():-1, pack.isMember("keyframe"), pack.packedSize(), segment_size, pack.isMember("ivec")?pack["ivec"].asStringRef().data():0);
+    update(pack["time"].asInt(), pack.isMember("offset")?pack["offset"].asInt():0, pack["trackid"].asInt(), pack["data"].asStringRef().size(), pack.isMember("bpos")?pack["bpos"].asInt():0, pack.isMember("keyframe"), pack.packedSize(), segment_size, pack.isMember("ivec")?pack["ivec"].asStringRef().data():0);
   }
 
   ///\brief Updates a meta object given a DTSC::Packet
@@ -1418,13 +1420,13 @@ namespace DTSC {
     unsigned int ivecLen;
     pack.getString("ivec", ivec, ivecLen);
     /*LTS
-    update(pack.getTime(), pack.hasMember("offset")?pack.getInt("offset"):0, pack.getTrackId(), dataLen, pack.hasMember("bpos")?pack.getInt("bpos"):-1, pack.hasMember("keyframe"), pack.getDataLen(), segment_size);
+    update(pack.getTime(), pack.hasMember("offset")?pack.getInt("offset"):0, pack.getTrackId(), dataLen, pack.hasMember("bpos")?pack.getInt("bpos"):0, pack.hasMember("keyframe"), pack.getDataLen(), segment_size);
     LTS*/
-    update(pack.getTime(), pack.hasMember("offset")?pack.getInt("offset"):0, pack.getTrackId(), dataLen, pack.hasMember("bpos")?pack.getInt("bpos"):-1, pack.hasMember("keyframe"), pack.getDataLen(), segment_size, ivecLen?ivec:0);
+    update(pack.getTime(), pack.hasMember("offset")?pack.getInt("offset"):0, pack.getTrackId(), dataLen, pack.hasMember("bpos")?pack.getInt("bpos"):0, pack.hasMember("keyframe"), pack.getDataLen(), segment_size, ivecLen?ivec:0);
   }
 
   ///\brief Updates a meta object given a DTSC::Packet with byte position override.
-  void Meta::updatePosOverride(DTSC::Packet & pack, unsigned long bpos) {
+  void Meta::updatePosOverride(DTSC::Packet & pack, uint64_t bpos) {
     char * data;
     unsigned int dataLen;
     pack.getString("data", data, dataLen);
@@ -1437,7 +1439,7 @@ namespace DTSC {
     update(pack.getTime(), pack.hasMember("offset")?pack.getInt("offset"):0, pack.getTrackId(), dataLen, bpos, pack.hasMember("keyframe"), pack.getDataLen(), 5000, ivecLen?ivec:0);
   }
 
-  void Meta::update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, long long packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size, const char * ivec){
+  void Meta::update(long long packTime, long long packOffset, long long packTrack, long long packDataSize, uint64_t packBytePos, bool isKeyframe, long long packSendSize, unsigned long segment_size, const char * ivec){
     DONTEVEN_MSG("Updating meta with: t=%lld, o=%lld, s=%lld, t=%lld, p=%lld", packTime, packOffset, packDataSize, packTrack, packBytePos);
     if (!packSendSize){
       //time and trackID are part of the 20-byte header.
@@ -1448,7 +1450,10 @@ namespace DTSC {
       //data adds packDataSize+5 bytes (string type) and 6 bytes (2+namelen)
       packSendSize = 24 + (packOffset?17:0) + (packBytePos>=0?15:0) + (isKeyframe?19:0) + packDataSize+11;
     }
-    vod = (packBytePos >= 0);
+    if (vod != (packBytePos > 0)){
+      INFO_MSG("Changing stream from %s to %s (bPos=%lld)", vod?"VoD":"live", (packBytePos >= 0)?"Vod":"live", packBytePos);
+    }
+    vod = (packBytePos > 0);
     live = !vod;
     if (packTrack > 0 && tracks.count(packTrack)){
       tracks[packTrack].update(packTime, packOffset, packDataSize, packBytePos, isKeyframe, packSendSize, segment_size, ivec);
@@ -2022,6 +2027,63 @@ namespace DTSC {
       it->second.reset();
     }
   }
+
+
+  PartIter::PartIter(Track & Trk, Fragment & frag){
+    tRef = &Trk;
+    pIt = tRef->parts.begin();
+    kIt = tRef->keys.begin();
+    uint32_t fragNum = frag.getNumber();
+    while (kIt->getNumber() < fragNum && kIt != tRef->keys.end()){
+      uint32_t kParts = kIt->getParts();
+      for (uint32_t pCount = 0; pCount < kParts && pIt != tRef->parts.end(); ++pCount){
+        ++pIt;
+      }
+      ++kIt;
+    }
+    if (kIt == tRef->keys.end()){tRef = 0;}
+    currInKey = 0;
+    lastKey = fragNum + frag.getLength();
+  }
+
+  /// Dereferences into a Value reference.
+  /// If invalid iterator, returns an empty reference and prints a warning message.
+  Part & PartIter::operator*() const{
+    if (tRef && pIt != tRef->parts.end()){
+      return *pIt;
+    }
+    static Part error;
+    WARN_MSG("Dereferenced invalid Part iterator");
+    return error;
+  }
+
+  /// Dereferences into a Value reference.
+  /// If invalid iterator, returns an empty reference and prints a warning message.
+  Part* PartIter::operator->() const{
+    return &(operator*());
+  }
+
+  /// True if not done iterating.
+  PartIter::operator bool() const{
+    return (tRef && pIt != tRef->parts.end());
+  }
+
+  PartIter & PartIter::operator++(){
+    if (*this){
+      ++pIt;
+      if (++currInKey >= kIt->getParts()){
+        currInKey = 0;
+        //check if we're done iterating - we assume done if past the last key or arrived past the fragment
+        if (++kIt == tRef->keys.end() || kIt->getNumber() >= lastKey){
+          tRef = 0;
+        }
+      }
+    }
+    return *this;
+  }
+
+
+
 }
 
 
diff --git a/lib/http_parser.cpp b/lib/http_parser.cpp
index e1704330..46510b74 100644
--- a/lib/http_parser.cpp
+++ b/lib/http_parser.cpp
@@ -696,7 +696,7 @@ void HTTP::Parser::Chunkify(const char * data, unsigned int size, Socket::Connec
   if (sendingChunks) {
     //prepend the chunk size and \r\n
     if (!size){
-      conn.SendNow("0\r\n\r\n\r\n", 7);
+      conn.SendNow("0\r\n\r\n", 5);
     }
     size_t offset = 8;
     unsigned int t_size = size;