diff --git a/lib/dtsc.h b/lib/dtsc.h
index 0ddc6793..730d7d5d 100644
--- a/lib/dtsc.h
+++ b/lib/dtsc.h
@@ -325,6 +325,7 @@ namespace DTSC {
       std::string init;
       std::string codec;
       std::string type;
+      std::string lang;///< ISO 639-2 Language of track, empty or und if unknown.
       //audio only
       int rate;
       int size;
diff --git a/lib/dtscmeta.cpp b/lib/dtscmeta.cpp
index 69e1e8cf..0484d420 100644
--- a/lib/dtscmeta.cpp
+++ b/lib/dtscmeta.cpp
@@ -1124,6 +1124,9 @@ namespace DTSC {
     codec = trackRef["codec"].asStringRef();
     type = trackRef["type"].asStringRef();
     init = trackRef["init"].asStringRef();
+    if (trackRef.isMember("lang") && trackRef["lang"].asStringRef().size()){
+      lang = trackRef["lang"].asStringRef();
+    }
     if (type == "audio") {
       rate = trackRef["rate"].asInt();
       size = trackRef["size"].asInt();
@@ -1178,6 +1181,9 @@ namespace DTSC {
     codec = trackRef.getMember("codec").asString();
     type = trackRef.getMember("type").asString();
     init = trackRef.getMember("init").asString();
+    if (trackRef.getMember("lang")){
+      lang = trackRef.getMember("lang").asString();
+    }
     if (type == "audio") {
       rate = trackRef.getMember("rate").asInt();
       size = trackRef.getMember("size").asInt();
@@ -1468,6 +1474,9 @@ namespace DTSC {
       str << std::hex << std::setw(2) << std::setfill('0') << (int)init[i];
     }
     str << std::dec << std::endl;
+    if (lang.size()){
+      str << std::string(indent + 2, ' ') << "Language: " << lang << std::endl;
+    }
     if (type == "audio") {
       str << std::string(indent + 2, ' ') << "Rate: " << rate << std::endl;
       str << std::string(indent + 2, ' ') << "Size: " << size << std::endl;
@@ -1552,6 +1561,9 @@ namespace DTSC {
       result << width << "x" << height << "_";
       result << (double)fpks / 1000 << "fps";
     }
+    if (lang.size() && lang != "und"){
+      result << "_" << lang;
+    }
     return result.str();
   }
 
@@ -1576,6 +1588,9 @@ namespace DTSC {
       result += parts.size() * 9 + 12;
       result += (ivecs.size() * 8) + 12; /*LTS*/
     }
+    if (lang.size() && lang != "und"){
+      result += 11 + lang.size();
+    }
     if (type == "audio") {
       result += 49;
     } else if (type == "video") {
@@ -1666,6 +1681,11 @@ namespace DTSC {
     writePointer(p, "\000\004type\002", 7);
     writePointer(p, convertInt(type.size()), 4);
     writePointer(p, type);
+    if (lang.size() && lang != "und"){
+      writePointer(p, "\000\004lang\002", 7);
+      writePointer(p, convertInt(lang.size()), 4);
+      writePointer(p, lang);
+    }
     if (type == "audio") {
       writePointer(p, "\000\004rate\001", 7);
       writePointer(p, convertLongLong(rate), 8);
@@ -1745,6 +1765,11 @@ namespace DTSC {
     conn.SendNow("\000\004type\002", 7);
     conn.SendNow(convertInt(type.size()), 4);
     conn.SendNow(type);
+    if (lang.size() && lang != "und"){
+    conn.SendNow("\000\004lang\002", 7);
+    conn.SendNow(convertInt(lang.size()), 4);
+    conn.SendNow(lang);
+    }
     if (type == "audio") {
       conn.SendNow("\000\004rate\001", 7);
       conn.SendNow(convertLongLong(rate), 8);
@@ -1879,6 +1904,9 @@ namespace DTSC {
       /*LTS-END*/
     }
     result["init"] = init;
+    if (lang.size() && lang != "und"){
+      result["lang"] = lang;
+    }
     result["trackid"] = trackID;
     result["firstms"] = (long long)firstms;
     result["lastms"] = (long long)lastms;
diff --git a/lib/mp4_generic.cpp b/lib/mp4_generic.cpp
index c0cdcc79..b035f953 100644
--- a/lib/mp4_generic.cpp
+++ b/lib/mp4_generic.cpp
@@ -2476,20 +2476,43 @@ namespace MP4 {
 
   void MDHD::setLanguage(uint16_t newLanguage) {
     if (getVersion() == 0) {
-      setInt16(newLanguage & 0x7F, 20);
+      setInt16(newLanguage & 0x7FFF, 20);
     } else {
-      setInt16(newLanguage & 0x7F, 32);
+      setInt16(newLanguage & 0x7FFF, 32);
     }
   }
 
-  uint16_t MDHD::getLanguage() {
+  uint16_t MDHD::getLanguageInt() {
     if (getVersion() == 0) {
-      return getInt16(20) & 0x7F;
+      return getInt16(20) & 0x7FFF;
     } else {
-      return getInt16(32) & 0x7F;
+      return getInt16(32) & 0x7FFF;
     }
   }
 
+  void MDHD::setLanguage(const std::string & newLanguage) {
+    if (newLanguage.size() != 3){
+      setLanguage("und");
+      return;
+    }
+    uint16_t newLang = 0;
+    newLang += (newLanguage[0] - 0x60) & 0x1F;
+    newLang <<= 5;
+    newLang += (newLanguage[1] - 0x60) & 0x1F;
+    newLang <<= 5;
+    newLang += (newLanguage[2] - 0x60) & 0x1F;
+    setLanguage(newLang);
+  }
+
+  std::string MDHD::getLanguage() {
+    uint16_t lInt = getLanguageInt();
+    std::string ret;
+    ret += (char)(((lInt & 0x7C00) >> 10) + 0x60);
+    ret += (char)(((lInt & 0x3E0) >> 5) + 0x60);
+    ret += (char)((lInt & 0x1F) + 0x60);
+    return ret;
+  }
+
   std::string MDHD::toPrettyString(uint32_t indent) {
     std::stringstream r;
     r << std::string(indent, ' ') << "[mdhd] Media Header Box (" << boxedSize() << ")" << std::endl;
@@ -2498,7 +2521,7 @@ namespace MP4 {
     r << std::string(indent + 1, ' ') << "ModificationTime: " << getModificationTime() << std::endl;
     r << std::string(indent + 1, ' ') << "TimeScale: " << getTimeScale() << std::endl;
     r << std::string(indent + 1, ' ') << "Duration: " << getDuration() << std::endl;
-    r << std::string(indent + 1, ' ') << "Language: 0x" << std::hex << getLanguage() << std::dec << std::endl;
+    r << std::string(indent + 1, ' ') << "Language: " << getLanguage() << std::endl;
     return r.str();
   }
 
diff --git a/lib/mp4_generic.h b/lib/mp4_generic.h
index d2dc7b04..5e870857 100644
--- a/lib/mp4_generic.h
+++ b/lib/mp4_generic.h
@@ -515,9 +515,10 @@ namespace MP4 {
       uint32_t getTimeScale();
       void setDuration(uint64_t newDuration);
       uint64_t getDuration();
-      ///\todo return language properly
       void setLanguage(uint16_t newLanguage);
-      uint16_t getLanguage();
+      uint16_t getLanguageInt();
+      void setLanguage(const std::string & newLanguage);
+      std::string getLanguage();
       std::string toPrettyString(uint32_t indent = 0);
   };
 
diff --git a/lib/ts_packet.cpp b/lib/ts_packet.cpp
index 0e61f829..6fad3d8c 100644
--- a/lib/ts_packet.cpp
+++ b/lib/ts_packet.cpp
@@ -258,6 +258,9 @@ namespace TS {
       if (getRandomAccess()){
         output << " [RandomXS]";
       }
+      if (getESPriority()){
+        output << " [ESPriority]";
+      }
       if (hasPCR()) {
         output << " [PCR " << (double)getPCR() / 27000000 << "s]";
       }
@@ -286,7 +289,7 @@ namespace TS {
       return output.str();
     }
     
-    if (detailLevel >= 3){
+    if (detailLevel >= 10){
       output << std::string(indent+2, ' ') << "Raw data bytes:";
       unsigned int size = getDataSize();
       
@@ -325,12 +328,6 @@ namespace TS {
     }
   }
 
-/// Gets the elementary stream priority indicator of a Packet
-/// \return  The elementary stream priority indicator of a Packet
-  bool Packet::hasESpriority() const{
-    return strBuf[5] & 0x20;
-  }
-
   bool Packet::hasDiscontinuity() const{
     return strBuf[5] & 0x80;
   }
@@ -366,6 +363,15 @@ namespace TS {
     return strBuf[5] & 0x40;
   }
 
+/// Gets whether this Packet has the priority bit set
+/// \return Whether or not this Packet has the priority bit set
+  bool Packet::getESPriority() const{
+    if (getAdaptationField() < 2) {
+      return false;
+    }
+    return strBuf[5] & 0x20;
+  }
+
 ///Gets the value of the PCR flag
 ///\return true if there is a PCR, false otherwise
   bool Packet::hasPCR() const{
@@ -408,6 +414,30 @@ namespace TS {
     }
   }
 
+///Gets the value of the ES priority flag
+///\return the value of the ES priority flag
+  void Packet::setESPriority(bool NewVal) {
+    updPos(6);
+    if (getAdaptationField() == 3) {
+      if (!strBuf[4]) {
+        strBuf[4] = 1;
+      }
+      if (NewVal) {
+        strBuf[5] |= 0x20;
+      } else {
+        strBuf[5] &= 0xDF;
+      }
+    } else {
+      setAdaptationField(3);
+      strBuf[4] = 1;
+      if (NewVal) {
+        strBuf[5] = 0x20;
+      } else {
+        strBuf[5] = 0x00;
+      }
+    }
+  }
+
 /// Transforms the Packet into a standard Program Association Table
   void Packet::setDefaultPAT() {
     static int MyCntr = 0;
@@ -959,17 +989,85 @@ namespace TS {
     while (entry) {
       output << std::string(indent + 4, ' ');
       stream_pids[entry.getElementaryPid()] = entry.getCodec() + std::string(" ") + entry.getStreamTypeString();
-      output << "Stream " << entry.getElementaryPid() << ": " << stream_pids[entry.getElementaryPid()] << " (" << entry.getStreamType() << "), Info (" << entry.getESInfoLength() << ") = ";
-      for (unsigned int i = 0; i<entry.getESInfoLength(); ++i){
-        output << std::hex << std::setw(2) << std::setfill('0') << std::uppercase << (int)entry.getESInfo()[i] << std::dec;
-      }
-      output << std::endl;
+      output << "Stream " << entry.getElementaryPid() << ": " << stream_pids[entry.getElementaryPid()] << " (" << entry.getStreamType() << ")" << std::endl;
+      output << ProgramDescriptors(entry.getESInfo(), entry.getESInfoLength()).toPrettyString(indent+6);
       entry.advance();
     }
     output << std::string(indent + 2, ' ') << "CRC32: " << std::hex << std::setw(8) << std::setfill('0') << std::uppercase << getCRC() << std::dec << std::endl;
     return output.str();
   }
-  
+
+  ProgramDescriptors::ProgramDescriptors(const char * data, const uint32_t len) : p_data(data), p_len(len){
+  }
+
+  ///Returns the ISO-629 language code, or "und" if unknown.
+  std::string ProgramDescriptors::getLanguage() const{
+    for (uint32_t p = 0; p + 1 < p_len; p += p_data[p+1]+2){
+      if (p_data[p] == 0x0A){//language tag
+        //We assume the first one is the only interesting one
+        return std::string(p_data+p+2, 3);
+      }
+    }
+    //No tag found! Undetermined by default.
+    return "und";
+  }
+
+  ///Prints all descriptors we understand in a readable format, the others in raw hex.
+  std::string ProgramDescriptors::toPrettyString(size_t indent) const{
+    std::stringstream output;
+    for (uint32_t p = 0; p + 1 < p_len; p += p_data[p+1]+2){
+      switch (p_data[p]){
+        case 0x0A:{//ISO 639-2 language tag (ISO 13818-1)
+          uint32_t offset = 0;
+          while (offset < p_data[p+1]){//single language
+            output << std::string(indent, ' ') << "Language: " << std::string(p_data+p+2+offset,3);
+            switch (p_data[p+5+offset]){
+              case 1: output << ", clean effects";
+            }
+            output << std::endl;
+            offset += 4;
+          }
+        } break;
+        case 0x7C:{//AAC descriptor (EN 300 468)
+          if (p_data[p+1] < 2 || p+2+p_data[p+1] > p_len){continue;}//skip broken data
+          output << std::string(indent, ' ') << "AAC profile: ";
+          switch (p_data[p+2]){
+            case 0x50: output << "AAC, level 1"; break;
+            case 0x51: output << "AAC, level 2"; break;
+            case 0x52: output << "AAC, level 4"; break;
+            case 0x53: output << "AAC, level 5"; break;
+            case 0x58: output << "AAC-HE, level 2"; break;
+            case 0x59: output << "AAC-HE, level 3"; break;
+            case 0x5A: output << "AAC-HE, level 4"; break;
+            case 0x5B: output << "AAC-HE, level 5"; break;
+            case 0x60: output << "AAC-HEv2, level 2"; break;
+            case 0x61: output << "AAC-HEv2, level 3"; break;
+            case 0x62: output << "AAC-HEv2, level 4"; break;
+            case 0x63: output << "AAC-HEv2, level 5"; break;
+            default: output << std::hex << std::setw(2) << std::setfill('0') << std::uppercase << (int)p_data[p+2] << std::dec;
+          }
+          if (p_data[p+3] & 0x80){
+            output << ", type: " << std::hex << std::setw(2) << std::setfill('0') << std::uppercase << (int)p_data[p+3] << std::dec;
+          }
+          output << std::endl;
+          if (p_data[p+1] > 2){
+            output << std::string(indent+2, ' ') << "Extra data: ";
+            for (uint32_t offset = 2; p+2+offset < p_data[p+1]; ++offset){
+              output << std::hex << std::setw(2) << std::setfill('0') << std::uppercase << (int)p_data[p+2+offset] << std::dec;
+            }
+          }
+        } break;
+        default:{
+          output << std::string(indent, ' ') << "Undecoded descriptor: ";
+          for (uint32_t i = 0; i<p_data[p+1]+2; ++i){
+            output << std::hex << std::setw(2) << std::setfill('0') << std::uppercase << (int)p_data[p+i] << std::dec;
+          }
+          output << std::endl;
+        }
+      }
+    }
+    return output.str();
+  }
   
   /// Construct a PMT (special 188B ts packet) from a set of selected tracks and metadata.
   /// This function is not part of the packet class, but it is in the TS namespace.
@@ -988,6 +1086,12 @@ namespace TS {
       if (myMeta.tracks[*it].codec == "ID3"){
         sectionLen += myMeta.tracks[*it].init.size();
       }
+      if (myMeta.tracks[*it].codec == "AAC"){
+        sectionLen += 4;//aac descriptor
+        if (myMeta.tracks[*it].lang.size() == 3 && myMeta.tracks[*it].lang != "und"){
+          sectionLen += 6;//language descriptor
+        }
+      }
     }
     PMT.setSectionLength(0xB00D + sectionLen);
     PMT.setProgramNumber(1);
@@ -1019,6 +1123,14 @@ namespace TS {
         entry.setStreamType(0x24);
       }else if (myMeta.tracks[*it].codec == "AAC"){
         entry.setStreamType(0x0F);
+        std::string aac_info("\174\002\121\000", 4);//AAC descriptor: AAC Level 2. Hardcoded, because... what are AAC levels, anyway?
+        //language code ddescriptor
+        if (myMeta.tracks[*it].lang.size() == 3 && myMeta.tracks[*it].lang != "und"){
+          aac_info.append("\012\004", 2);
+          aac_info.append(myMeta.tracks[*it].lang);
+          aac_info.append("\000", 1);
+        }
+        entry.setESInfo(aac_info);
       }else if (myMeta.tracks[*it].codec == "MP3"){
         entry.setStreamType(0x03);
       }else if (myMeta.tracks[*it].codec == "AC3"){
diff --git a/lib/ts_packet.h b/lib/ts_packet.h
index 3cdfce36..cba395f2 100644
--- a/lib/ts_packet.h
+++ b/lib/ts_packet.h
@@ -45,6 +45,8 @@ namespace TS {
       bool getUnitStart() const;      
       void setRandomAccess(bool newVal);
       bool getRandomAccess() const;
+      void setESPriority(bool newVal);
+      bool getESPriority() const;
       
       void setDiscontinuity(bool newVal);
       bool hasDiscontinuity() const;
@@ -53,7 +55,6 @@ namespace TS {
       bool hasSplicingPoint() const;
       bool hasTransportError() const;
       bool hasPriority() const;
-      bool hasESpriority() const;
 
       //Helper functions
       operator bool() const;
@@ -101,6 +102,16 @@ namespace TS {
       std::string toPrettyString(size_t indent) const;
   };
 
+  class ProgramDescriptors {
+    public:
+      ProgramDescriptors(const char * data, const uint32_t len);
+      std::string getLanguage() const;
+      std::string toPrettyString(size_t indent) const;
+    private:
+      const char * p_data;
+      const uint32_t p_len;
+  };
+
   class ProgramMappingEntry {
     public:
       ProgramMappingEntry(char * begin, char * end);
diff --git a/src/output/output_progressive_mp4.cpp b/src/output/output_progressive_mp4.cpp
index 8b7fd070..dd2c482f 100644
--- a/src/output/output_progressive_mp4.cpp
+++ b/src/output/output_progressive_mp4.cpp
@@ -159,6 +159,7 @@ namespace Mist {
       
       //Add the mandatory MDHD and HDLR boxes to the MDIA
       MP4::MDHD mdhdBox(thisTrack.lastms - thisTrack.firstms);
+      mdhdBox.setLanguage(thisTrack.lang);
       mdiaBox.setContent(mdhdBox, mdiaOffset++);
       MP4::HDLR hdlrBox(thisTrack.type, thisTrack.getIdentifier());
       mdiaBox.setContent(hdlrBox, mdiaOffset++);
diff --git a/src/output/output_srt.cpp b/src/output/output_srt.cpp
index ad5d6f3d..31ba5e03 100644
--- a/src/output/output_srt.cpp
+++ b/src/output/output_srt.cpp
@@ -17,6 +17,7 @@ namespace Mist {
     capa["url_handler"] = "http";
     capa["url_type"] = "subtitle";
     capa["codecs"][0u][0u].append("srt");
+    capa["codecs"][0u][0u].append("TTXT");
     capa["methods"][0u]["handler"] = "http";
     capa["methods"][0u]["type"] = "html5/text/plain";
     capa["methods"][0u]["priority"] = 8ll;
@@ -36,6 +37,9 @@ namespace Mist {
     tmp.write(tmpBuf, tmpLen);
     tmp << " --> ";
     time += thisPacket.getInt("duration");
+    if (time == thisPacket.getTime()){
+      time += len * 100 + 1000;
+    }
     tmpLen = sprintf(tmpBuf, "%.2llu:%.2llu:%.2llu,%.3llu", (time / 3600000), ((time % 3600000) / 60000), (((time % 3600000) % 60000) / 1000), time % 1000);
     tmp.write(tmpBuf, tmpLen);
     tmp << std::endl;
diff --git a/src/output/output_ts_base.cpp b/src/output/output_ts_base.cpp
index ecb61e4d..1c1b08fa 100644
--- a/src/output/output_ts_base.cpp
+++ b/src/output/output_ts_base.cpp
@@ -40,7 +40,8 @@ namespace Mist {
         packData.setDiscontinuity(true);
         if (myMeta.tracks[thisPacket.getTrackId()].type == "video"){
           if (thisPacket.getInt("keyframe")){
-            packData.setRandomAccess(1);
+            packData.setRandomAccess(true);
+            packData.setESPriority(true);
           }      
           packData.setPCR(thisPacket.getTime() * 27000);      
         }