diff --git a/lib/cmaf.cpp b/lib/cmaf.cpp
index ec4271cf..a8c01775 100644
--- a/lib/cmaf.cpp
+++ b/lib/cmaf.cpp
@@ -410,7 +410,10 @@ namespace CMAF{
         trunBox.setSampleInformation(sampleInfo, trunOffset++);
       }
     }else{
-      WARN_MSG("Empty CMAF header for track %zu: %zu-%zu contains no packets (first: %" PRIu64 ", last: %" PRIu64 "), firstPart=%zu, lastPart=%zu", track, startTime, endTime, M.getFirstms(track), M.getLastms(track), firstPart, endPart);
+      WARN_MSG("Empty CMAF header for track %zu: %" PRIu64 "-%" PRIu64 " contains no packets (first: %" PRIu64
+               ", last: %" PRIu64 "), firstPart=%zu, lastPart=%zu",
+               track, startTime, endTime, M.getFirstms(track), M.getLastms(track), firstPart,
+               endPart);
     }
     trafBox.setContent(trunBox, 2);
 
diff --git a/lib/comms.h b/lib/comms.h
index a3f1b7b5..9f459422 100644
--- a/lib/comms.h
+++ b/lib/comms.h
@@ -55,7 +55,7 @@ namespace Comms{
 
   protected:
     bool master;
-    size_t index;
+    uint64_t index;
     size_t currentSize;
     IPC::semaphore sem;
     IPC::sharedPage dataPage;
diff --git a/lib/dtsc.cpp b/lib/dtsc.cpp
index c9378ed9..0b3228c9 100644
--- a/lib/dtsc.cpp
+++ b/lib/dtsc.cpp
@@ -318,7 +318,7 @@ namespace DTSC{
     Bit::htobl(data + offset, Bit::btohl(data + offset) + appendLen);
   }
 
-  size_t Packet::getDataStringLen(){return Bit::btohl(data + getDataStringLenOffset());}
+  uint32_t Packet::getDataStringLen(){return Bit::btohl(data + getDataStringLenOffset());}
 
   /// Method can only be used when using internal functions to build the data.
   size_t Packet::getDataStringLenOffset(){
@@ -472,11 +472,11 @@ namespace DTSC{
 
   ///\brief Returns the size of this packet.
   ///\return The size of this packet.
-  uint64_t Packet::getDataLen() const{return dataLen;}
+  uint32_t Packet::getDataLen() const{return dataLen;}
 
   ///\brief Returns the size of the payload of this packet.
   ///\return The size of the payload of this packet.
-  size_t Packet::getPayloadLen() const{
+  uint32_t Packet::getPayloadLen() const{
     if (version == DTSC_V2){
       return dataLen - 20;
     }else{
diff --git a/lib/dtsc.h b/lib/dtsc.h
index 7523b545..2f05fe3c 100644
--- a/lib/dtsc.h
+++ b/lib/dtsc.h
@@ -123,9 +123,9 @@ namespace DTSC{
       void nullMember(const std::string & memb);
     size_t getTrackId() const;
     char *getData() const;
-    size_t getDataLen() const;
-    size_t getPayloadLen() const;
-    size_t getDataStringLen();
+    uint32_t getDataLen() const;
+    uint32_t getPayloadLen() const;
+    uint32_t getDataStringLen();
     size_t getDataStringLenOffset();
     JSON::Value toJSON() const;
     std::string toSummary() const;
@@ -136,8 +136,8 @@ namespace DTSC{
     packType version;
     void resize(size_t size);
     char *data;
-    size_t bufferLen;
-    size_t dataLen;
+    uint32_t bufferLen;
+    uint32_t dataLen;
 
     uint64_t prevNalSize;
   };
diff --git a/lib/flv_tag.cpp b/lib/flv_tag.cpp
index 5d85b419..b3b81f94 100644
--- a/lib/flv_tag.cpp
+++ b/lib/flv_tag.cpp
@@ -493,14 +493,14 @@ bool FLV::Tag::DTSCAudioInit(const std::string & codec, unsigned int sampleRate,
   return true;
 }
 
-bool FLV::Tag::DTSCMetaInit(const DTSC::Meta &M, std::set<long unsigned int> &selTracks){
+bool FLV::Tag::DTSCMetaInit(const DTSC::Meta &M, std::set<size_t> &selTracks){
   AMF::Object amfdata("root", AMF::AMF0_DDV_CONTAINER);
   amfdata.addContent(AMF::Object("", "onMetaData"));
   amfdata.addContent(AMF::Object("", AMF::AMF0_ECMA_ARRAY));
   AMF::Object trinfo = AMF::Object("trackinfo", AMF::AMF0_STRICT_ARRAY);
   int i = 0;
   uint64_t mediaLen = 0;
-  for (std::set<long unsigned int>::iterator it = selTracks.begin(); it != selTracks.end(); it++){
+  for (std::set<size_t>::iterator it = selTracks.begin(); it != selTracks.end(); it++){
     if (M.getLastms(*it) - M.getFirstms(*it) > mediaLen){
       mediaLen = M.getLastms(*it) - M.getFirstms(*it);
     }
diff --git a/lib/flv_tag.h b/lib/flv_tag.h
index bea495ea..ca27f472 100644
--- a/lib/flv_tag.h
+++ b/lib/flv_tag.h
@@ -52,7 +52,7 @@ namespace FLV{
     bool DTSCLoader(DTSC::Packet &packData, const DTSC::Meta &M, size_t idx);
     bool DTSCVideoInit(DTSC::Meta &meta, uint32_t vTrack);
     bool DTSCAudioInit(const std::string & codec, unsigned int sampleRate, unsigned int sampleSize, unsigned int channels, const std::string & initData);
-    bool DTSCMetaInit(const DTSC::Meta &M, std::set<long unsigned int> &selTracks);
+    bool DTSCMetaInit(const DTSC::Meta &M, std::set<size_t> &selTracks);
     void toMeta(DTSC::Meta &meta, AMF::Object &amf_storage);
     void toMeta(DTSC::Meta &meta, AMF::Object &amf_storage, size_t &reTrack, const std::map<std::string, std::string> &targetParams);
     bool MemLoader(char *D, unsigned int S, unsigned int &P);
diff --git a/lib/h264.cpp b/lib/h264.cpp
index 76948a54..63c92c49 100644
--- a/lib/h264.cpp
+++ b/lib/h264.cpp
@@ -38,10 +38,10 @@ namespace h264{
     return false;
   }
 
-  std::deque<nalu::nalData> analysePackets(const char *data, unsigned long len){
+  std::deque<nalu::nalData> analysePackets(const char *data, size_t len){
     std::deque<nalu::nalData> res;
 
-    int offset = 0;
+    size_t offset = 0;
     // Make sure entire packet is within len
     while (offset + 5 < len && Bit::btohl(data + offset) + offset + 4 <= len){
       nalu::nalData entry;
diff --git a/lib/mp4.cpp b/lib/mp4.cpp
index 38a49a2c..033f7f71 100644
--- a/lib/mp4.cpp
+++ b/lib/mp4.cpp
@@ -110,7 +110,7 @@ namespace MP4{
         fseek(newData, 0, SEEK_END);
         return true;
       }
-      DONTEVEN_MSG("skipping size 0x%.8lX", size);
+      DONTEVEN_MSG("skipping box of size %" PRIu64, size);
       if (fseek(newData, pos + size, SEEK_SET) == 0){
         return true;
       }else{
diff --git a/lib/mp4_generic.cpp b/lib/mp4_generic.cpp
index d6fd2008..9822e4c2 100644
--- a/lib/mp4_generic.cpp
+++ b/lib/mp4_generic.cpp
@@ -2772,7 +2772,7 @@ namespace MP4{
     if (count == index){
       setBox(box, offset);
     }else{
-      INFO_MSG("Should not be here! Index is %zu, count is %zu, offset is %zu, payloadSize is %zu",
+      INFO_MSG("Should not be here! Index is %zu, count is %zu, offset is %zu, payloadSize is %" PRIu64,
                index, count, offset, payloadSize());
     }
   }
@@ -2916,7 +2916,7 @@ namespace MP4{
     if (count == index){
       setBox(box, offset);
     }else{
-      INFO_MSG("Should not be here! Index is %zu, count is %zu, offset is %zu, payloadSize is %zu",
+      INFO_MSG("Should not be here! Index is %zu, count is %zu, offset is %zu, payloadSize is %" PRIu64,
                index, count, offset, payloadSize());
     }
   }
diff --git a/lib/ogg.cpp b/lib/ogg.cpp
index 426ddf9b..fcca9e9a 100644
--- a/lib/ogg.cpp
+++ b/lib/ogg.cpp
@@ -98,8 +98,8 @@ namespace OGG{
 
   /// Reads an OGG Page from the source and if valid, removes it from source.
   bool Page::read(std::string &newData){
-    int len = newData.size();
-    int total = 0;
+    size_t len = newData.size();
+    size_t total = 0;
     segments.clear();
     if (newData.size() < 27){return false;}
     if (newData.substr(0, 4) != "OggS"){
@@ -127,7 +127,7 @@ namespace OGG{
       newData.erase(0, *it);
     }
 
-    INFO_MSG("Erased %lu bytes from the input", len - newData.size());
+    INFO_MSG("Erased %zu bytes from the input", len - newData.size());
     return true;
   }
 
@@ -203,12 +203,12 @@ namespace OGG{
 
   void Page::setGranulePosition(long long unsigned int newVal){set_64(data + 6, newVal);}
 
-  long unsigned int Page::getBitstreamSerialNumber(){
+  uint32_t Page::getBitstreamSerialNumber(){
     // return ntohl(((long unsigned int*)(data+14))[0]);
     return get_32(data + 14);
   }
 
-  void Page::setBitstreamSerialNumber(long unsigned int newVal){set_32(data + 14, newVal);}
+  void Page::setBitstreamSerialNumber(uint32_t newVal){set_32(data + 14, newVal);}
 
   long unsigned int Page::getPageSequenceNumber(){return get_32(data + 18);}
 
diff --git a/lib/ogg.h b/lib/ogg.h
index 719bb119..031b8fca 100644
--- a/lib/ogg.h
+++ b/lib/ogg.h
@@ -45,8 +45,8 @@ namespace OGG{
     void setHeaderType(char newVal);
     long long unsigned int getGranulePosition();
     void setGranulePosition(long long unsigned int newVal);
-    long unsigned int getBitstreamSerialNumber();
-    void setBitstreamSerialNumber(long unsigned int newVal);
+    uint32_t getBitstreamSerialNumber();
+    void setBitstreamSerialNumber(uint32_t newVal);
     long unsigned int getCRCChecksum();
     void setCRCChecksum(long unsigned int newVal);
     long unsigned int getPageSequenceNumber();
diff --git a/lib/rtmpchunks.cpp b/lib/rtmpchunks.cpp
index d8160fff..e7c151f0 100644
--- a/lib/rtmpchunks.cpp
+++ b/lib/rtmpchunks.cpp
@@ -498,7 +498,7 @@ bool RTMPStream::doHandshake(){
   char Version;
   // Read C0
   if (handshake_in.size() < 1537){
-    FAIL_MSG("Handshake wasn't filled properly (%lu/1537) - aborting!", handshake_in.size());
+    FAIL_MSG("Handshake wasn't filled properly (%zu/1537) - aborting!", handshake_in.size());
     return false;
   }
   Version = RTMPStream::handshake_in[0];
diff --git a/lib/rtp.cpp b/lib/rtp.cpp
index c8f454a8..8f4c6ca5 100644
--- a/lib/rtp.cpp
+++ b/lib/rtp.cpp
@@ -771,7 +771,7 @@ namespace RTP{
         return;
       }
       if (fuaBuffer.size() && ((pl[2] & 0x80) || missed)){
-        WARN_MSG("H265 FU packet incompleted: %lu", fuaBuffer.size());
+        WARN_MSG("H265 FU packet incompleted: %zu", fuaBuffer.size());
         Bit::htobl(fuaBuffer, fuaBuffer.size() - 4); // size-prepend
         fuaBuffer[4] |= 0x80;                        // set error bit
         handleHEVCSingle(msTime, fuaBuffer, fuaBuffer.size(),
@@ -794,7 +794,7 @@ namespace RTP{
       }
 
       if (pl[2] & 0x40){// last packet
-        VERYHIGH_MSG("H265 FU packet type %s (%u) completed: %lu",
+        VERYHIGH_MSG("H265 FU packet type %s (%u) completed: %zu",
                      h265::typeToStr((fuaBuffer[4] & 0x7E) >> 1),
                      (uint8_t)((fuaBuffer[4] & 0x7E) >> 1), fuaBuffer.size());
         Bit::htobl(fuaBuffer, fuaBuffer.size() - 4); // size-prepend
@@ -923,7 +923,7 @@ namespace RTP{
       }
       if (fuaBuffer.size() && ((pl[1] & 0x80) || missed)){
         WARN_MSG("Ending unfinished FU-A");
-        INSANE_MSG("H264 FU-A packet incompleted: %lu", fuaBuffer.size());
+        INSANE_MSG("H264 FU-A packet incompleted: %zu", fuaBuffer.size());
         fuaBuffer.truncate(0);
         return;
       }
@@ -941,7 +941,7 @@ namespace RTP{
       }
 
       if (pl[1] & 0x40){// last packet
-        INSANE_MSG("H264 FU-A packet type %u completed: %lu", (unsigned int)(fuaBuffer[4] & 0x1F),
+        INSANE_MSG("H264 FU-A packet type %u completed: %zu", (unsigned int)(fuaBuffer[4] & 0x1F),
                    fuaBuffer.size());
         uint8_t nalType = (fuaBuffer[4] & 0x1F);
         if (nalType == 7 || nalType == 8){
diff --git a/lib/sdp.cpp b/lib/sdp.cpp
index 6fff3dbe..a6ae716b 100644
--- a/lib/sdp.cpp
+++ b/lib/sdp.cpp
@@ -607,10 +607,10 @@ namespace SDP{
   }
 
   /// Calculates H265 track metadata from sps and pps data stored in tracks[trackNo]
-  void State::updateH265Init(size_t tid){
+  void State::updateH265Init(uint64_t tid){
     SDP::Track &RTrk = tracks[tid];
     if (!RTrk.hevcInfo.haveRequired()){
-      MEDIUM_MSG("Aborted meta fill for hevc track %lu: no info nal unit", tid);
+      MEDIUM_MSG("Aborted meta fill for hevc track %" PRIu64 ": no info nal unit", tid);
       return;
     }
     myMeta->setInit(tid, RTrk.hevcInfo.generateHVCC());
@@ -647,7 +647,7 @@ namespace SDP{
   }
 
   size_t State::getTrackNoForChannel(uint8_t chan){
-    for (std::map<size_t, Track>::iterator it = tracks.begin(); it != tracks.end(); ++it){
+    for (std::map<uint64_t, Track>::iterator it = tracks.begin(); it != tracks.end(); ++it){
       if (chan == it->second.channel){return it->first;}
     }
     return INVALID_TRACK_ID;
@@ -671,7 +671,7 @@ namespace SDP{
 
     while (loop){
       if (tracks.size()){
-        for (std::map<size_t, Track>::iterator it = tracks.begin(); it != tracks.end(); ++it){
+        for (std::map<uint64_t, Track>::iterator it = tracks.begin(); it != tracks.end(); ++it){
           if (!it->second.control.size()){
             it->second.control = "/track" + JSON::Value(it->first).asString();
             INFO_MSG("Control track: %s", it->second.control.c_str());
@@ -681,7 +681,7 @@ namespace SDP{
                urlString.substr(urlString.size() - it->second.control.size()) == it->second.control) ||
               (pw.size() >= it->second.control.size() &&
                pw.substr(pw.size() - it->second.control.size()) == it->second.control)){
-            INFO_MSG("Parsing SETUP against track %lu", it->first);
+            INFO_MSG("Parsing SETUP against track %" PRIu64, it->first);
             if (!it->second.parseTransport(H.GetHeader("Transport"), cH, src, myMeta, it->first)){
               return INVALID_TRACK_ID;
             }
@@ -720,7 +720,7 @@ namespace SDP{
     return ((double)M->getRate(tid) / 1000.0);
   }
 
-  void State::updateInit(const size_t tid, const std::string &initData){
+  void State::updateInit(const uint64_t tid, const std::string &initData){
     myMeta->setInit(tid, initData.data(), initData.size());
   }
 
diff --git a/lib/sdp.h b/lib/sdp.h
index 0de371c6..4560aeca 100644
--- a/lib/sdp.h
+++ b/lib/sdp.h
@@ -47,8 +47,8 @@ namespace SDP{
     void (*incomingPacketCallback)(const DTSC::Packet &pkt);
     void parseSDP(const std::string &sdp);
     void parseSDPEx(const std::string &sdp);
-    void updateH264Init(size_t trackNo);
-    void updateH265Init(size_t tid);
+    void updateH264Init(uint64_t trackNo);
+    void updateH265Init(uint64_t trackNo);
     void updateInit(const uint64_t trackNo, const std::string &initData);
     size_t getTrackNoForChannel(uint8_t chan);
     size_t parseSetup(HTTP::Parser &H, const std::string &host, const std::string &source);
@@ -56,8 +56,8 @@ namespace SDP{
 
   public:
     DTSC::Meta *myMeta;
-    std::map<size_t, RTP::toDTSC> tConv; ///< Converters to DTSC
-    std::map<size_t, Track> tracks; ///< List of selected tracks with SDP-specific session data.
+    std::map<uint64_t, RTP::toDTSC> tConv; ///< Converters to DTSC
+    std::map<uint64_t, Track> tracks; ///< List of selected tracks with SDP-specific session data.
   };
 
   std::string mediaDescription(const DTSC::Meta *M, size_t tid);
diff --git a/lib/sdp_media.cpp b/lib/sdp_media.cpp
index 8f7f2d40..86214c80 100644
--- a/lib/sdp_media.cpp
+++ b/lib/sdp_media.cpp
@@ -847,7 +847,7 @@ namespace SDP{
     M.setType(tid, "video");
     M.setRate(tid, answerVideoFormat.getVideoRate());
     M.setID(tid, answerVideoFormat.payloadType);
-    INFO_MSG("Setup video track %zu for payload type %zu", tid, answerVideoFormat.payloadType);
+    INFO_MSG("Setup video track %zu for payload type %" PRIu64, tid, answerVideoFormat.payloadType);
     return true;
   }
 
@@ -869,7 +869,7 @@ namespace SDP{
     M.setChannels(tid, answerAudioFormat.getAudioNumChannels());
     M.setSize(tid, answerAudioFormat.getAudioBitSize());
     M.setID(tid, answerAudioFormat.payloadType);
-    INFO_MSG("Setup audio track %zu for payload time %zu", tid, answerAudioFormat.payloadType);
+    INFO_MSG("Setup audio track %zu for payload time %" PRIu64, tid, answerAudioFormat.payloadType);
     return true;
   }
 
@@ -1017,8 +1017,8 @@ namespace SDP{
           usedProfile = "42e01f";
         }
 
-        addLine("a=fmtp:%u profile-level-id=%s;level-asymmetry-allowed=1;packetization-mode=1",
-                fmtMedia->payloadType, usedProfile.c_str());
+        addLine("a=fmtp:%u profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1",
+                fmtMedia->payloadType);
       }else if (fmtMedia->encodingName == "OPUS"){
         addLine("a=fmtp:%u minptime=10;useinbandfec=1", fmtMedia->payloadType);
       }
diff --git a/lib/stream.cpp b/lib/stream.cpp
index 11832446..c0332780 100644
--- a/lib/stream.cpp
+++ b/lib/stream.cpp
@@ -331,7 +331,7 @@ void Util::packetSorter::getTrackList(std::set<size_t> &toFill) const{
 JSON::Value Util::getStreamConfig(const std::string &streamname){
   JSON::Value result;
   if (streamname.size() > 100){
-    FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%lu).", streamname.c_str(),
+    FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%zu).", streamname.c_str(),
              streamname.size());
     return result;
   }
@@ -408,7 +408,7 @@ bool Util::startInput(std::string streamname, std::string filename, bool forkFir
                       const std::map<std::string, std::string> &overrides, pid_t *spawn_pid){
   sanitizeName(streamname);
   if (streamname.size() > 100){
-    FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%lu).", streamname.c_str(),
+    FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%zu).", streamname.c_str(),
              streamname.size());
     return false;
   }
diff --git a/lib/ts_packet.cpp b/lib/ts_packet.cpp
index 94ed7ff0..f4039af8 100644
--- a/lib/ts_packet.cpp
+++ b/lib/ts_packet.cpp
@@ -1369,13 +1369,13 @@ namespace TS{
   ///\param selectedTracks tracks to include in PMT creation
   ///\param myMeta
   ///\returns character pointer to a static 188B TS packet
-  const char *createPMT(std::set<unsigned long> &selectedTracks, const DTSC::Meta &M, int contCounter){
+  const char *createPMT(std::set<size_t> &selectedTracks, const DTSC::Meta &M, int contCounter){
     static ProgramMappingTable PMT;
     PMT.setPID(4096);
     PMT.setTableId(2);
     // section length met 2 tracks: 0xB017
     int sectionLen = 0;
-    for (std::set<long unsigned int>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
+    for (std::set<size_t>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
       std::string codec = M.getCodec(*it);
       sectionLen += 5;
       if (codec == "ID3" || codec == "RAW"){sectionLen += M.getInit(*it).size();}
@@ -1394,7 +1394,7 @@ namespace TS{
     PMT.setLastSectionNumber(0);
     PMT.setContinuityCounter(contCounter);
     int vidTrack = -1;
-    for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
+    for (std::set<size_t>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
       if (M.getType(*it) == "video"){
         vidTrack = *it;
         break;
@@ -1404,7 +1404,7 @@ namespace TS{
     PMT.setPCRPID(getUniqTrackID(M, vidTrack));
     PMT.setProgramInfoLength(0);
     ProgramMappingEntry entry = PMT.getEntry(0);
-    for (std::set<long unsigned int>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
+    for (std::set<size_t>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
       std::string codec = M.getCodec(*it);
       entry.setElementaryPid(getUniqTrackID(M, *it));
       std::string es_info;
diff --git a/lib/ts_packet.h b/lib/ts_packet.h
index a74f4b38..bd098718 100644
--- a/lib/ts_packet.h
+++ b/lib/ts_packet.h
@@ -255,7 +255,7 @@ namespace TS{
 
   size_t getUniqTrackID(const DTSC::Meta &M, size_t idx);
 
-  const char *createPMT(std::set<unsigned long> &selectedTracks, const DTSC::Meta &M, int contCounter = 0);
+  const char *createPMT(std::set<size_t> &selectedTracks, const DTSC::Meta &M, int contCounter = 0);
   const char *createSDT(const std::string &streamName, int contCounter = 0);
 
 }// namespace TS
diff --git a/lib/ts_stream.cpp b/lib/ts_stream.cpp
index 79cf4478..1cab14e1 100644
--- a/lib/ts_stream.cpp
+++ b/lib/ts_stream.cpp
@@ -635,7 +635,7 @@ namespace TS{
           offset += pesPayload[offset] + 1;
         }
         if (realPayloadSize < offset+packSize){
-          WARN_MSG("Encountered invalid Opus frame (%zu > %zu) - discarding!", offset+packSize, realPayloadSize);
+          WARN_MSG("Encountered invalid Opus frame (%zu > %" PRIu64 ") - discarding!", offset+packSize, realPayloadSize);
           break;
         }
         out.push_back(DTSC::Packet());
@@ -783,7 +783,7 @@ namespace TS{
     }
 
     if (!packetReady){
-      ERROR_MSG("Track %lu: PES without valid packets?", tid);
+      ERROR_MSG("Track %zu: PES without valid packets?", tid);
       return;
     }
 
@@ -955,7 +955,7 @@ namespace TS{
       switch (it->second){
       case H264:{
         if (!spsInfo.count(it->first) || !ppsInfo.count(it->first)){
-          MEDIUM_MSG("Aborted meta fill for h264 track %lu: no SPS/PPS", it->first);
+          MEDIUM_MSG("Aborted meta fill for h264 track %zu: no SPS/PPS", it->first);
           continue;
         }
         // First generate needed data
@@ -984,7 +984,7 @@ namespace TS{
       }break;
       case H265:{
         if (!hevcInfo.count(it->first) || !hevcInfo[it->first].haveRequired()){
-          MEDIUM_MSG("Aborted meta fill for hevc track %lu: no info nal unit", it->first);
+          MEDIUM_MSG("Aborted meta fill for hevc track %zu: no info nal unit", it->first);
           continue;
         }
         addNewTrack = true;
@@ -1123,7 +1123,7 @@ namespace TS{
           entry.advance();
         }
       }
-      MEDIUM_MSG("Initialized track %lu as %s %s", idx, codec.c_str(), type.c_str());
+      MEDIUM_MSG("Initialized track %zu as %s %s", idx, codec.c_str(), type.c_str());
     }
   }
 
diff --git a/src/analysers/analyser_h264.cpp b/src/analysers/analyser_h264.cpp
index 42d46c22..e496f6a9 100644
--- a/src/analysers/analyser_h264.cpp
+++ b/src/analysers/analyser_h264.cpp
@@ -39,7 +39,7 @@ bool AnalyserH264::parsePacket(){
     FAIL_MSG("Could not read a NAL unit at position %" PRIu64, prePos);
     return false;
   }
-  HIGH_MSG("Read a %lu-byte NAL unit at position %" PRIu64, size, prePos);
+  HIGH_MSG("Read a %zu-byte NAL unit at position %" PRIu64, size, prePos);
   if (detail >= 2){nalPtr->toPrettyString(std::cout);}
   //SPS unit? Find the FPS, if any.
   if (nalPtr->getType() == 7){
diff --git a/src/analysers/analyser_hls.cpp b/src/analysers/analyser_hls.cpp
index d185d558..18902ec5 100644
--- a/src/analysers/analyser_hls.cpp
+++ b/src/analysers/analyser_hls.cpp
@@ -105,7 +105,7 @@ bool AnalyserHLS::parsePacket(){
       if (!DL.get(part.uri)){return false;}
       if (DL.getHeader("Content-Length") != ""){
         if (DL.data().size() != atoi(DL.getHeader("Content-Length").c_str())){
-          FAIL_MSG("Expected %s bytes of data, but only received %lu.",
+          FAIL_MSG("Expected %s bytes of data, but only received %zu.",
                    DL.getHeader("Content-Length").c_str(), DL.data().size());
           return false;
         }
diff --git a/src/analysers/analyser_ogg.cpp b/src/analysers/analyser_ogg.cpp
index c4774a82..51736401 100644
--- a/src/analysers/analyser_ogg.cpp
+++ b/src/analysers/analyser_ogg.cpp
@@ -28,10 +28,10 @@ bool AnalyserOGG::parsePacket(){
       sn2Codec[oggPage.getBitstreamSerialNumber()] = "Opus";
     }
     if (sn2Codec[oggPage.getBitstreamSerialNumber()] != ""){
-      INFO_MSG("Bitstream %" PRIu64 " recognized as %s", oggPage.getBitstreamSerialNumber(),
+      INFO_MSG("Bitstream %" PRIu32 " recognized as %s", oggPage.getBitstreamSerialNumber(),
                sn2Codec[oggPage.getBitstreamSerialNumber()].c_str());
     }else{
-      WARN_MSG("Bitstream %" PRIu64 " not recognized!", oggPage.getBitstreamSerialNumber());
+      WARN_MSG("Bitstream %" PRIu32 " not recognized!", oggPage.getBitstreamSerialNumber());
     }
   }
 
diff --git a/src/analysers/analyser_rtmp.cpp b/src/analysers/analyser_rtmp.cpp
index 38c1a342..7c3a08e8 100644
--- a/src/analysers/analyser_rtmp.cpp
+++ b/src/analysers/analyser_rtmp.cpp
@@ -67,17 +67,17 @@ bool AnalyserRTMP::parsePacket(){
   }
 
   // We now know for sure that we've parsed a packet
-  DETAIL_HI("Chunk info: [%#2X] CS ID %u, timestamp %u, len %u, type ID %u, Stream ID %u",
+  DETAIL_HI("Chunk info: [%#2X] CS ID %u, timestamp %" PRIu64 ", len %u, type ID %u, Stream ID %u",
             next.headertype, next.cs_id, next.timestamp, next.len, next.msg_type_id, next.msg_stream_id);
   switch (next.msg_type_id){
   case 0: // does not exist
-    DETAIL_LOW("Error chunk @ %lu - CS%i, T%i, L%i, LL%i, MID%i", read_in - strbuf.size(),
+    DETAIL_LOW("Error chunk @ %zu - CS%u, T%" PRIu64 ", L%i, LL%i, MID%i", read_in - strbuf.size(),
                next.cs_id, next.timestamp, next.real_len, next.len_left, next.msg_stream_id);
     return 0;
     break; // happens when connection breaks unexpectedly
   case 1:  // set chunk size
     RTMPStream::chunk_rec_max = ntohl(*(int *)next.data.c_str());
-    DETAIL_MED("CTRL: Set chunk size: %" PRIu64, RTMPStream::chunk_rec_max);
+    DETAIL_MED("CTRL: Set chunk size: %zu", RTMPStream::chunk_rec_max);
     break;
   case 2: // abort message - we ignore this one
     DETAIL_MED("CTRL: Abort message: %" PRIu32, Bit::btohl(next.data.data()));
@@ -85,7 +85,7 @@ bool AnalyserRTMP::parsePacket(){
     break;
   case 3: // ack
     RTMPStream::snd_window_at = Bit::btohl(next.data.data());
-    DETAIL_MED("CTRL: Acknowledgement: %" PRIu64, RTMPStream::snd_window_at);
+    DETAIL_MED("CTRL: Acknowledgement: %zu", RTMPStream::snd_window_at);
     break;
   case 4:{
     int16_t ucmtype = Bit::btohs(next.data.data());
@@ -124,12 +124,12 @@ bool AnalyserRTMP::parsePacket(){
   case 5: // window size of other end
     RTMPStream::rec_window_size = Bit::btohl(next.data.data());
     RTMPStream::rec_window_at = RTMPStream::rec_cnt;
-    DETAIL_MED("CTRL: Window size: %" PRIu64, RTMPStream::rec_window_size);
+    DETAIL_MED("CTRL: Window size: %zu", RTMPStream::rec_window_size);
     break;
   case 6:
     RTMPStream::snd_window_size = Bit::btohl(next.data.data());
     // 4 bytes window size, 1 byte limit type (ignored)
-    DETAIL_MED("CTRL: Set peer bandwidth: %" PRIu64, RTMPStream::snd_window_size);
+    DETAIL_MED("CTRL: Set peer bandwidth: %zu", RTMPStream::snd_window_size);
     break;
   case 8:
   case 9:
diff --git a/src/controller/controller_statistics.cpp b/src/controller/controller_statistics.cpp
index 0ab6fcf6..c5b7f643 100644
--- a/src/controller/controller_statistics.cpp
+++ b/src/controller/controller_statistics.cpp
@@ -670,7 +670,7 @@ void Controller::statSession::update(uint64_t index, Comms::Statistics &statComm
   uint64_t currPktLost = getPktLost();
   uint64_t currPktRetrans = getPktRetransmit();
   if (currUp - prevUp < 0 || currDown - prevDown < 0){
-    INFO_MSG("Negative data usage! %lldu/%lldd (u%lld->%lld) in %s over %s, #%lu", currUp - prevUp,
+    INFO_MSG("Negative data usage! %lldu/%lldd (u%lld->%lld) in %s over %s, #%" PRIu64, currUp - prevUp,
              currDown - prevDown, prevUp, currUp, myStream.c_str(), myConnector.c_str(), index);
   }else{
     if (!noBWCount){
diff --git a/src/input/input.cpp b/src/input/input.cpp
index 84831421..886af766 100644
--- a/src/input/input.cpp
+++ b/src/input/input.cpp
@@ -529,7 +529,7 @@ namespace Mist{
     if (M && M.getVod()){
       meta.removeEmptyTracks();
       parseHeader();
-      INFO_MSG("Header parsed, %lu tracks", M.getValidTracks().size());
+      INFO_MSG("Header parsed, %zu tracks", M.getValidTracks().size());
     }
 
     if (!streamName.size()){
@@ -1121,7 +1121,7 @@ namespace Mist{
         WARN_MSG("No pages for track %zu found", *it);
         continue;
       }
-      MEDIUM_MSG("Track %zu (%s) split into %zu pages", *it, M.getCodec(*it).c_str(), tPages.getEndPos());
+      MEDIUM_MSG("Track %zu (%s) split into %" PRIu64 " pages", *it, M.getCodec(*it).c_str(), tPages.getEndPos());
       for (size_t j = tPages.getDeleted(); j < tPages.getEndPos(); j++){
         size_t pageNumber = tPages.getInt("firstkey", j);
         size_t pageKeys = tPages.getInt("keycount", j);
diff --git a/src/input/input_buffer.cpp b/src/input/input_buffer.cpp
index abbd51aa..c3cf51e2 100644
--- a/src/input/input_buffer.cpp
+++ b/src/input/input_buffer.cpp
@@ -499,7 +499,7 @@ namespace Mist{
 
     std::set<size_t> validTracks = M.getValidTracks();
     if (validTracks != prevValidTracks){
-      MEDIUM_MSG("Valid tracks count changed from %lu to %lu", prevValidTracks.size(), validTracks.size());
+      MEDIUM_MSG("Valid tracks count changed from %zu to %zu", prevValidTracks.size(), validTracks.size());
       prevValidTracks = validTracks;
       if (Triggers::shouldTrigger("LIVE_TRACK_LIST")){
         JSON::Value triggerPayload;
@@ -566,7 +566,7 @@ namespace Mist{
     if (tmpNum < meta.biggestFragment() / 2){tmpNum = meta.biggestFragment() / 2;}
     segmentSize = meta.getMinimumFragmentDuration();
     if (segmentSize != tmpNum){
-      INFO_MSG("Setting segmentSize from %" PRIu64 " to new value of %" PRIu64, segmentSize, tmpNum);
+      INFO_MSG("Setting segmentSize from %zu to new value of %" PRIu64, segmentSize, tmpNum);
       segmentSize = tmpNum;
       meta.setMinimumFragmentDuration(segmentSize);
     }
diff --git a/src/input/input_hls.cpp b/src/input/input_hls.cpp
index f5d01a88..8faad7d1 100644
--- a/src/input/input_hls.cpp
+++ b/src/input/input_hls.cpp
@@ -809,7 +809,7 @@ namespace Mist{
           tsStream.getEarliestPacket(thisPacket);
           tid = getOriginalTrackId(currentPlaylist, thisPacket.getTrackId());
           if (!tid){
-            INFO_MSG("Track %" PRIu64 " on PLS %" PRIu64 " -> %" PRIu32, thisPacket.getTrackId(), currentPlaylist, tid);
+            INFO_MSG("Track %zu on PLS %" PRIu64 " -> %" PRIu32, thisPacket.getTrackId(), currentPlaylist, tid);
             continue;
           }
         }else{
@@ -1243,7 +1243,7 @@ namespace Mist{
          pListIt != listEntries.end(); pListIt++){
       segCount += pListIt->second.size();
       if (pListIt->second.size()){
-        INSANE_MSG("Playlist %u contains %lu segments, with the earliest segment starting @%zu ms", pListIt->first, pListIt->second.size(), firstTimeStamp);
+        INSANE_MSG("Playlist %u contains %zu segments, with the earliest segment starting @%" PRIu64 " ms", pListIt->first, pListIt->second.size(), firstTimeStamp);
         if (pListIt->second.front().timestamp < firstTimeStamp || tmpId < 0){
           firstTimeStamp = pListIt->second.front().timestamp;
           tmpId = pListIt->first;
diff --git a/src/input/input_mp3.cpp b/src/input/input_mp3.cpp
index 83bc7f37..cbe75a5a 100644
--- a/src/input/input_mp3.cpp
+++ b/src/input/input_mp3.cpp
@@ -63,7 +63,7 @@ namespace Mist{
       size_t id3size = (((int)header[6] & 0x7F) << 21) | (((int)header[7] & 0x7F) << 14) |
                        (((int)header[8] & 0x7F) << 7) |
                        ((header[9] & 0x7F) + 10 + ((header[5] & 0x10) ? 10 : 0));
-      INFO_MSG("id3 size: %lu bytes", id3size);
+      INFO_MSG("id3 size: %zu bytes", id3size);
       fseek(inFile, id3size, SEEK_SET);
     }else{
       fseek(inFile, 0, SEEK_SET);
diff --git a/src/input/input_mp4.cpp b/src/input/input_mp4.cpp
index b27a5943..45dcd19a 100644
--- a/src/input/input_mp4.cpp
+++ b/src/input/input_mp4.cpp
@@ -484,7 +484,7 @@ namespace Mist{
       malSize = curPart.size;
     }
     if (fread(data, curPart.size, 1, inFile) != 1){
-      FAIL_MSG("read unsuccessful at %" PRIu64, ftell(inFile));
+      FAIL_MSG("read unsuccessful at %ld", ftell(inFile));
       thisPacket.null();
       return;
     }
diff --git a/src/input/input_ogg.cpp b/src/input/input_ogg.cpp
index e8a04aa8..7e262138 100644
--- a/src/input/input_ogg.cpp
+++ b/src/input/input_ogg.cpp
@@ -430,7 +430,7 @@ namespace Mist{
       }
       tmpPos.segmentNo = backChrs - (loc - buffer);
       tmpPos.bytepos -= tmpPos.segmentNo;
-      INFO_MSG("Track %zu, segment %zu found at bytepos %" PRIu64, it->first, tmpPos.segmentNo,
+      INFO_MSG("Track %zu, segment %" PRIu64 " found at bytepos %" PRIu64, it->first, tmpPos.segmentNo,
                tmpPos.bytepos);
 
       currentPositions.insert(tmpPos);
diff --git a/src/input/input_rtsp.cpp b/src/input/input_rtsp.cpp
index ce48c0ef..fef613bb 100644
--- a/src/input/input_rtsp.cpp
+++ b/src/input/input_rtsp.cpp
@@ -157,7 +157,7 @@ namespace Mist{
     }
     if (sdpState.tracks.size()){
       bool atLeastOne = false;
-      for (std::map<size_t, SDP::Track>::iterator it = sdpState.tracks.begin();
+      for (std::map<uint64_t, SDP::Track>::iterator it = sdpState.tracks.begin();
            it != sdpState.tracks.end(); ++it){
         transportSet = false;
         extraHeaders.clear();
@@ -358,7 +358,7 @@ namespace Mist{
   bool InputRTSP::handleUDP(){
     if (TCPmode){return false;}
     bool r = false;
-    for (std::map<size_t, SDP::Track>::iterator it = sdpState.tracks.begin();
+    for (std::map<uint64_t, SDP::Track>::iterator it = sdpState.tracks.begin();
          it != sdpState.tracks.end(); ++it){
       Socket::UDPConnection &s = it->second.data;
       it->second.sorter.setCallback(it->first, insertRTP);
diff --git a/src/input/input_ts.cpp b/src/input/input_ts.cpp
index f29582df..6165e333 100644
--- a/src/input/input_ts.cpp
+++ b/src/input/input_ts.cpp
@@ -587,7 +587,7 @@ namespace Mist{
           for (std::set<size_t>::iterator it = activeTracks.begin(); it != activeTracks.end(); it++){
             if (!liveStream.isDataTrack(*it)){continue;}
             if (threadTimer.count(*it) && ((Util::bootSecs() - threadTimer[*it]) > (2 * THREAD_TIMEOUT))){
-              WARN_MSG("Thread for track %" PRIu64 " timed out %" PRIu64
+              WARN_MSG("Thread for track %zu timed out %" PRIu64
                        " seconds ago without a clean shutdown.",
                        *it, Util::bootSecs() - threadTimer[*it]);
               threadTimer.erase(*it);
diff --git a/src/io.cpp b/src/io.cpp
index bb9f9a11..7bd5c4d7 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -220,7 +220,7 @@ namespace Mist{
     uint64_t pageSize = tPages.getInt("size", pageIdx);
     // Do nothing when there is not enough free space on the page to add the packet.
     if (pageSize - pageOffset < packDataLen){
-      FAIL_MSG("Track %" PRIu32 "p%" PRIu32 " : Pack %" PRIu64 "ms of %" PRIu64 "b exceeds size %" PRIu64 " @ bpos %" PRIu64,
+      FAIL_MSG("Track %" PRIu32 "p%" PRIu32 " : Pack %" PRIu64 "ms of %zub exceeds size %" PRIu64 " @ bpos %" PRIu64,
                packTrack, currPagNum, packTime, packDataLen, pageSize, pageOffset);
       return;
     }
@@ -386,7 +386,7 @@ namespace Mist{
         }
         // Create the book keeping data for the new page
         nextPageNum = tPages.getInt("firstkey", endPage - 1) + tPages.getInt("keycount", endPage - 1);
-        HIGH_MSG("Live page transition from %" PRIu32 ":%zu to %" PRIu32 ":%" PRIu32, packTrack,
+        HIGH_MSG("Live page transition from %" PRIu32 ":%" PRIu64 " to %" PRIu32 ":%" PRIu32, packTrack,
                  tPages.getInt("firstkey", endPage - 1), packTrack, nextPageNum);
         tPages.setInt("firstkey", nextPageNum, endPage);
         tPages.setInt("firsttime", packTime, endPage);
diff --git a/src/output/output.cpp b/src/output/output.cpp
index b2cbb6d3..dd8b0ef3 100644
--- a/src/output/output.cpp
+++ b/src/output/output.cpp
@@ -857,7 +857,7 @@ namespace Mist{
           }
           if (mainTrack == ti->first){continue;}// skip self
           if (!M.trackValid(ti->first)){
-            HIGH_MSG("Skipping track %lu, not in tracks", ti->first);
+            HIGH_MSG("Skipping track %zu, not in tracks", ti->first);
             continue;
           }// ignore missing tracks
           if (M.getLastms(ti->first) < seekPos + needsLookAhead + extraKeepAway + M.getMinKeepAway(ti->first)){
@@ -865,7 +865,7 @@ namespace Mist{
             break;
           }
           if (meta.getLastms(ti->first) == M.getFirstms(ti->first)){
-            HIGH_MSG("Skipping track %lu, last equals first", ti->first);
+            HIGH_MSG("Skipping track %zu, last equals first", ti->first);
             continue;
           }// ignore point-tracks
           if (meta.getLastms(ti->first) < seekPos){
@@ -881,7 +881,7 @@ namespace Mist{
     /*LTS-START*/
     if (isRecordingToFile){
       if (M.getLive()){
-        MEDIUM_MSG("Stream currently contains data from %lu ms to %lu ms", startTime(), endTime());
+        MEDIUM_MSG("Stream currently contains data from %" PRIu64 " ms to %" PRIu64 " ms", startTime(), endTime());
       }
       // Overwrite recstart/recstop with recstartunix/recstopunix if set
       if (M.getLive() &&
@@ -952,7 +952,7 @@ namespace Mist{
         INFO_MSG("Recording will start at timestamp %llu ms", atoll(targetParams["recstart"].c_str()));
       }
       else{
-        INFO_MSG("Recording will start at timestamp %lu ms", endTime()); 
+        INFO_MSG("Recording will start at timestamp %" PRIu64 " ms", endTime()); 
       }
       if (targetParams.count("recstop")){
         INFO_MSG("Recording will stop at timestamp %llu ms", atoll(targetParams["recstop"].c_str()));
@@ -988,12 +988,12 @@ namespace Mist{
             int64_t origStartUnix = startUnix;
             startUnix += Util::epoch();
             if (startUnix < unixStreamBegin){
-              INFO_MSG("Waiting for stream to reach playback starting point. Current last ms is '%lu'", streamAvail);
+              INFO_MSG("Waiting for stream to reach playback starting point. Current last ms is '%" PRIu64 "'", streamAvail);
               while (startUnix < Util::epoch() - (endTime() / 1000) && keepGoing()){
                 Util::wait(1000);
                 stats();
                 startUnix = origStartUnix + Util::epoch();
-                HIGH_MSG("Waiting for stream to reach playback starting point. Current last ms is '%lu'", streamAvail);
+                HIGH_MSG("Waiting for stream to reach playback starting point. Current last ms is '%" PRIu64 "'", streamAvail);
               }
             }
           }
@@ -1034,11 +1034,11 @@ namespace Mist{
           }
           int64_t streamAvail = M.getLastms(mainTrack);
           int64_t lastUpdated = Util::getMS();
-          INFO_MSG("Waiting for stream to reach playback starting point. Current last ms is '%lu'", streamAvail);
+          INFO_MSG("Waiting for stream to reach playback starting point. Current last ms is '%" PRIu64 "'", streamAvail);
           while (Util::getMS() - lastUpdated < 5000 && startRec > streamAvail && keepGoing()){
             Util::sleep(500);
             if (M.getLastms(mainTrack) > streamAvail){
-              HIGH_MSG("Waiting for stream to reach playback starting point. Current last ms is '%lu'", streamAvail);
+              HIGH_MSG("Waiting for stream to reach playback starting point. Current last ms is '%" PRIu64 "'", streamAvail);
               stats();
               streamAvail = M.getLastms(mainTrack);
               lastUpdated = Util::getMS();
@@ -1064,7 +1064,7 @@ namespace Mist{
       MEDIUM_MSG("Initial seek to %" PRIu64 "ms", seekPos);
       seek(seekPos);
     }else{
-      ERROR_MSG("Aborting seek to %" PRIu64 " since stream only has available from %lu ms to %lu ms", seekPos, startTime(), endTime());
+      ERROR_MSG("Aborting seek to %" PRIu64 " since stream only has available from %" PRIu64 " ms to %" PRIu64 " ms", seekPos, startTime(), endTime());
     }
   }
 
@@ -1116,7 +1116,7 @@ namespace Mist{
         }
       }
       if (realTime != newSpeed){
-        HIGH_MSG("Changing playback speed from %" PRIu64 " to %" PRIu64 "(%" PRIu64 " ms LA, %" PRIu64 " ms mKA, %lu eKA)", realTime, newSpeed, needsLookAhead, mKa, extraKeepAway);
+        HIGH_MSG("Changing playback speed from %" PRIu64 " to %" PRIu64 "(%" PRIu64 " ms LA, %" PRIu64 " ms mKA, %" PRIu64 " eKA)", realTime, newSpeed, needsLookAhead, mKa, extraKeepAway);
         firstTime = Util::bootMS() - (cTime * newSpeed / 1000);
         realTime = newSpeed;
       }
@@ -1144,15 +1144,15 @@ namespace Mist{
         }
         if (mainTrack == ti->first){continue;}// skip self
         if (meta.getLastms(ti->first) == meta.getFirstms(ti->first)){
-          HIGH_MSG("Skipping track %lu, last equals first", ti->first);
+          HIGH_MSG("Skipping track %zu, last equals first", ti->first);
           continue;
         }// ignore point-tracks
-        HIGH_MSG("Track %lu is good", ti->first);
+        HIGH_MSG("Track %zu is good", ti->first);
       }
       // if yes, seek here
       if (good){
         HIGH_MSG("Skipping forward %" PRIu64 "ms (%" PRIu64 " ms LA, %" PRIu64
-                 " ms mKA, %lu eKA, > %" PRIu32 "ms, mSa %" PRIu64 " ms)",
+                 " ms mKA, %" PRIu64 " eKA, > %" PRIu32 "ms, mSa %" PRIu64 " ms)",
                  seekPos - cTime, needsLookAhead, mKa, extraKeepAway, seekCount * 100, maxSkipAhead);
         if (seekCount < 20){++seekCount;}
         seek(seekPos);
@@ -1316,7 +1316,7 @@ namespace Mist{
             // delay the stream until metadata has caught up, if needed
             if (needsLookAhead && M.getLive()){
               // we sleep in 20ms increments, or less if the lookahead time itself is less
-              uint32_t sleepTime = std::min(20ul, needsLookAhead);
+              uint32_t sleepTime = std::min((uint64_t)20, needsLookAhead);
               // wait at most double the look ahead time, plus ten seconds
               uint64_t timeoutTries = (needsLookAhead / sleepTime) * 2 + (10000 / sleepTime);
               uint64_t needsTime = thisTime + needsLookAhead;
@@ -1346,7 +1346,7 @@ namespace Mist{
                 meta.reloadReplacedPagesIfNeeded();
               }
               if (!timeoutTries){
-                WARN_MSG("Waiting for lookahead (%zums in %zu tracks) timed out - resetting lookahead!", needsLookAhead, userSelect.size());
+                WARN_MSG("Waiting for lookahead (%" PRIu64 "ms in %zu tracks) timed out - resetting lookahead!", needsLookAhead, userSelect.size());
                 needsLookAhead = 0;
               }
             }
@@ -1452,8 +1452,8 @@ namespace Mist{
     // depending on whether this is probably bad and the current debug level, print a message
     size_t printLevel = (probablyBad ? DLVL_WARN : DLVL_INFO);
     const Comms::Users &usr = userSelect.at(trackId);
-    DEBUG_MSG(printLevel, "Dropping %s (%s) track %zu@k%zu (nextP=%zu, lastP=%zu): %s",
-              streamName.c_str(), meta.getCodec(trackId).c_str(), trackId, usr.getKeyNum() + 1,
+    DEBUG_MSG(printLevel, "Dropping %s track %zu@k%zu (nextP=%" PRIu64 ", lastP=%" PRIu64 "): %s",
+              meta.getCodec(trackId).c_str(), trackId, usr.getKeyNum() + 1,
               pageNumForKey(trackId, usr.getKeyNum() + 1), pageNumMax(trackId), reason.c_str());
     // now actually drop the track from the buffer
     buffer.dropTrack(trackId);
@@ -1651,7 +1651,7 @@ namespace Mist{
           }
           //every ~16 seconds, reconnect to metadata
           if (emptyCount % 1600 == 0){
-            INFO_MSG("Reconnecting to input; track %" PRIu64 " key %" PRIu32 " is on page %" PRIu32 " and we're currently serving %" PRIu32 " from %" PRIu32, nxt.tid, thisKey+1, nextKeyPage, thisKey, currentPage[nxt.tid]);
+            INFO_MSG("Reconnecting to input; track %zu key %" PRIu32 " is on page %" PRIu32 " and we're currently serving %" PRIu32 " from %" PRIu32, nxt.tid, thisKey+1, nextKeyPage, thisKey, currentPage[nxt.tid]);
             reconnect();
             if (!meta){
               onFail("Could not connect to stream data", true);
@@ -1768,7 +1768,7 @@ namespace Mist{
 
     lastStats = now;
 
-    VERYHIGH_MSG("Writing stats: %s, %s, %u, %lu, %lu", getConnectedHost().c_str(), streamName.c_str(),
+    VERYHIGH_MSG("Writing stats: %s, %s, %u, %" PRIu64 ", %" PRIu64, getConnectedHost().c_str(), streamName.c_str(),
              crc & 0xFFFFFFFFu, myConn.dataUp(), myConn.dataDown());
     /*LTS-START*/
     if (statComm.getStatus() & COMM_STATUS_REQDISCONNECT){
diff --git a/src/output/output_ebml.cpp b/src/output/output_ebml.cpp
index e69cf876..59aec749 100644
--- a/src/output/output_ebml.cpp
+++ b/src/output/output_ebml.cpp
@@ -348,7 +348,7 @@ namespace Mist{
       EBML::sendElemHead(myConn, EBML::EID_CUES, cuesSize);
       uint64_t tmpsegSize = infoSize + tracksSize + seekheadSize + cuesSize +
                             EBML::sizeElemHead(EBML::EID_CUES, cuesSize);
-      for (std::map<uint64_t, uint64_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
+      for (std::map<size_t, size_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
         EBML::sendElemCuePoint(myConn, it->first, idx + 1, tmpsegSize, 0);
         tmpsegSize += it->second;
       }
@@ -358,8 +358,8 @@ namespace Mist{
 
   /// Seeks to the given byte position by doing a regular seek and remembering the byte offset from
   /// that point
-  void OutEBML::byteSeek(uint64_t startPos){
-    INFO_MSG("Seeking to %" PRIu64 " bytes", startPos);
+  void OutEBML::byteSeek(size_t startPos){
+    INFO_MSG("Seeking to %zu bytes", startPos);
     sentHeader = false;
     newClusterTime = 0;
     if (startPos == 0){
@@ -377,10 +377,10 @@ namespace Mist{
     }
     startPos -= headerSize;
     sentHeader = true; // skip the header
-    for (std::map<uint64_t, uint64_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
-      VERYHIGH_MSG("Cluster %" PRIu64 " (%" PRIu64 " bytes) -> %" PRIu64 " to go", it->first, it->second, startPos);
+    for (std::map<size_t, size_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
+      VERYHIGH_MSG("Cluster %zu (%zu bytes) -> %zu to go", it->first, it->second, startPos);
       if (startPos < it->second){
-        HIGH_MSG("Seek to fragment at %" PRIu64 " ms", it->first);
+        HIGH_MSG("Seek to fragment at %zu ms", it->first);
         myConn.skipBytes(startPos);
         seek(it->first);
         newClusterTime = it->first;
@@ -413,8 +413,8 @@ namespace Mist{
       totalSize = EBML::sizeElemEBML(doctype) + EBML::sizeElemHead(EBML::EID_SEGMENT, segmentSize) + segmentSize;
     }
 
-    size_t byteEnd = totalSize - 1;
-    size_t byteStart = 0;
+    uint64_t byteEnd = totalSize - 1;
+    uint64_t byteStart = 0;
     if (!M.getLive() && req.GetHeader("Range") != ""){
       //Range request
       if (parseRange(req.GetHeader("Range"), byteStart, byteEnd)){
@@ -521,7 +521,7 @@ namespace Mist{
       segmentSize = infoSize + tracksSize + seekheadSize + cuesSize +
                     EBML::sizeElemHead(EBML::EID_CUES, cuesSize);
       uint32_t cuesInside = 0;
-      for (std::map<uint64_t, uint64_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
+      for (std::map<size_t, size_t>::iterator it = clusterSizes.begin(); it != clusterSizes.end(); ++it){
         cuesInside += EBML::sizeElemCuePoint(it->first, idx + 1, segmentSize, 0);
         segmentSize += it->second;
       }
diff --git a/src/output/output_ebml.h b/src/output/output_ebml.h
index bc121263..4889f403 100644
--- a/src/output/output_ebml.h
+++ b/src/output/output_ebml.h
@@ -24,7 +24,7 @@ namespace Mist{
     uint64_t newClusterTime;
     // VoD-only
     void calcVodSizes();
-    size_t segmentSize;                    // size of complete segment contents (excl. header)
+    uint64_t segmentSize;                    // size of complete segment contents (excl. header)
     size_t tracksSize;                     // size of Tracks (incl. header)
     size_t infoSize;                       // size of Info (incl. header)
     size_t cuesSize;                       // size of Cues (excl. header)
diff --git a/src/output/output_mp4.cpp b/src/output/output_mp4.cpp
index 5a15d062..d5695c1e 100644
--- a/src/output/output_mp4.cpp
+++ b/src/output/output_mp4.cpp
@@ -836,7 +836,7 @@ namespace Mist{
        segfaults.
     */
     if (!thisPacket.getData()) {
-      FAIL_MSG("Current packet has no data, lookahead: %lu.", needsLookAhead);
+      FAIL_MSG("Current packet has no data, lookahead: %" PRIu64, needsLookAhead);
       return;
     }
     
@@ -1185,7 +1185,7 @@ namespace Mist{
           H.SendResponse("500", "Error generating MP4 header", myConn);
           return;
         }
-        INFO_MSG("Have %zu bytes, sending %zu bytes", headerData.size(), std::min(headerSize, byteEnd) - byteStart);
+        INFO_MSG("Have %zu bytes, sending %" PRIu64 " bytes", headerData.size(), std::min(headerSize, byteEnd) - byteStart);
         H.Chunkify(headerData + byteStart, std::min(headerSize, byteEnd) - byteStart, myConn);
         leftOver -= std::min(headerSize, byteEnd) - byteStart;
       }
diff --git a/src/output/output_ogg.cpp b/src/output/output_ogg.cpp
index 78d4737c..15325b95 100644
--- a/src/output/output_ogg.cpp
+++ b/src/output/output_ogg.cpp
@@ -66,7 +66,7 @@ namespace Mist{
     size_t index = 0;
     if (initData[0] == 0x02){//"special" case, requires interpretation similar to table
       if (initData.size() < 7){
-        FAIL_MSG("initData size too tiny (size: %lu)", initData.size());
+        FAIL_MSG("initData size too tiny (size: %zu)", initData.size());
         return false;
       }
       size_t len1 = 0;
@@ -94,7 +94,7 @@ namespace Mist{
       output.push_back(initData.substr(index));
     }else{
       if (initData.size() < 7){
-        FAIL_MSG("initData size too tiny (size: %lu)", initData.size());
+        FAIL_MSG("initData size too tiny (size: %zu)", initData.size());
         return false;
       }
       unsigned int len = 0;
diff --git a/src/output/output_rtmp.cpp b/src/output/output_rtmp.cpp
index d295d5a9..f63fce72 100644
--- a/src/output/output_rtmp.cpp
+++ b/src/output/output_rtmp.cpp
@@ -1329,7 +1329,7 @@ namespace Mist{
         break; // happens when connection breaks unexpectedly
       case 1:  // set chunk size
         RTMPStream::chunk_rec_max = Bit::btohl(next.data.data());
-        MEDIUM_MSG("CTRL: Set chunk size: %" PRIu64, RTMPStream::chunk_rec_max);
+        MEDIUM_MSG("CTRL: Set chunk size: %zu", RTMPStream::chunk_rec_max);
         break;
       case 2: // abort message - we ignore this one
         MEDIUM_MSG("CTRL: Abort message");
@@ -1438,7 +1438,7 @@ namespace Mist{
               tagTime -= (tagTime - ltt) - 1;
             }
           }
-          uint64_t idx = reTrackToID[reTrack];
+          size_t idx = reTrackToID[reTrack];
           if (idx != INVALID_TRACK_ID && !userSelect.count(idx)){
             userSelect[idx].reload(streamName, idx, COMM_STATUS_ACTIVE | COMM_STATUS_SOURCE);
           }
diff --git a/src/output/output_rtsp.cpp b/src/output/output_rtsp.cpp
index 8e09c10a..c4b235cc 100644
--- a/src/output/output_rtsp.cpp
+++ b/src/output/output_rtsp.cpp
@@ -506,7 +506,7 @@ namespace Mist{
   /// Reads and handles RTP packets over UDP, if needed
   void OutRTSP::handleUDP(){
     if (!isPushing()){return;}
-    for (std::map<size_t, SDP::Track>::iterator it = sdpState.tracks.begin();
+    for (std::map<uint64_t, SDP::Track>::iterator it = sdpState.tracks.begin();
          it != sdpState.tracks.end(); ++it){
       Socket::UDPConnection &s = it->second.data;
       it->second.sorter.setCallback(it->first, insertRTP);
diff --git a/src/output/output_ts_base.cpp b/src/output/output_ts_base.cpp
index 90a5be58..42843c45 100644
--- a/src/output/output_ts_base.cpp
+++ b/src/output/output_ts_base.cpp
@@ -134,7 +134,7 @@ namespace Mist{
         while (i + 4 < (unsigned int)dataLen){
           ThisNaluSize = Bit::btohl(dataPointer + i);
           if (ThisNaluSize + i + 4 > dataLen){
-            WARN_MSG("Too big NALU detected (%" PRIu32 " > %" PRIu64 ") - skipping!",
+            WARN_MSG("Too big NALU detected (%" PRIu32 " > %zu) - skipping!",
                      ThisNaluSize + i + 4, dataLen);
             break;
           }
diff --git a/src/process/process_livepeer.cpp b/src/process/process_livepeer.cpp
index 87121a04..85ad12fc 100644
--- a/src/process/process_livepeer.cpp
+++ b/src/process/process_livepeer.cpp
@@ -230,7 +230,7 @@ namespace Mist{
               trackId = (S.ID << 16) + thisPacket.getTrackId();
               size_t idx = M.trackIDToIndex(trackId, getpid());
               if (idx == INVALID_TRACK_ID || !M.getCodec(idx).size()){
-                INFO_MSG("Initializing track %zi as %" PRIu64 " for playlist %" PRIu64, thisPacket.getTrackId(), trackId, S.ID);
+                INFO_MSG("Initializing track %zi as %" PRIu64 " for playlist %zu", thisPacket.getTrackId(), trackId, S.ID);
                 S.S.initializeMetadata(meta, thisPacket.getTrackId(), trackId);
               }
             }
diff --git a/src/utils/util_nuke.cpp b/src/utils/util_nuke.cpp
index 8f984864..fa8a1c86 100644
--- a/src/utils/util_nuke.cpp
+++ b/src/utils/util_nuke.cpp
@@ -99,7 +99,7 @@ int main(int argc, char **argv){
                   for (uint64_t j = pages.getDeleted(); j < pages.getEndPos(); j++){
                     char thisPageName[NAME_BUFFER_SIZE];
                     snprintf(thisPageName, NAME_BUFFER_SIZE, SHM_TRACK_DATA,
-                             Util::streamName, i, pages.getInt("firstkey", j));
+                             Util::streamName, i, (uint32_t)pages.getInt("firstkey", j));
                     IPC::sharedPage p(thisPageName, 0);
                     p.master = true;
                   }