diff --git a/src/Common/config.h b/src/Common/config.h
index 14c57815..78adbea5 100644
--- a/src/Common/config.h
+++ b/src/Common/config.h
@@ -57,7 +57,7 @@ bool loadIniConfig(const char *ini_path = nullptr);
 #define CLEAR_ARR(arr) for(auto &item : arr){ item = 0;}
 #endif //CLEAR_ARR
 
-#define SERVER_NAME "ZLMediaKit-4.0"
+#define SERVER_NAME "ZLMediaKit-4.0(build in " __DATE__ " " __TIME__ ")"
 #define VHOST_KEY "vhost"
 #define HTTP_SCHEMA "http"
 #define RTSP_SCHEMA "rtsp"
diff --git a/src/Http/HttpClient.cpp b/src/Http/HttpClient.cpp
index c7483b33..16551796 100644
--- a/src/Http/HttpClient.cpp
+++ b/src/Http/HttpClient.cpp
@@ -71,7 +71,7 @@ void HttpClient::sendRequest(const string &strUrl, float fTimeOutSec) {
         host = FindField(host.data(), NULL, ":");
     }
     _header.emplace("Host", host);
-    _header.emplace("Tools", "ZLMediaKit");
+    _header.emplace("Tools", SERVER_NAME);
     _header.emplace("Connection", "keep-alive");
     _header.emplace("Accept", "*/*");
     _header.emplace("Accept-Language", "zh-CN,zh;q=0.8");
diff --git a/src/Http/HttpSession.cpp b/src/Http/HttpSession.cpp
index a6a886d1..fb59dc91 100644
--- a/src/Http/HttpSession.cpp
+++ b/src/Http/HttpSession.cpp
@@ -398,7 +398,6 @@ static const string kContentType = "Content-Type";
 static const string kContentLength = "Content-Length";
 static const string kAccessControlAllowOrigin = "Access-Control-Allow-Origin";
 static const string kAccessControlAllowCredentials = "Access-Control-Allow-Credentials";
-static const string kServerName = SERVER_NAME;
 
 void HttpSession::sendResponse(const char *pcStatus,
                                bool bClose,
@@ -426,7 +425,7 @@ void HttpSession::sendResponse(const char *pcStatus,
 
     HttpSession::KeyValue &headerOut = const_cast<HttpSession::KeyValue &>(header);
     headerOut.emplace(kDate, dateStr());
-    headerOut.emplace(kServer, kServerName);
+    headerOut.emplace(kServer, SERVER_NAME);
     headerOut.emplace(kConnection, bClose ? "close" : "keep-alive");
     if(!bClose){
         string keepAliveString = "timeout=";
diff --git a/src/Rtmp/Rtmp.h b/src/Rtmp/Rtmp.h
index 8607fa62..74aaf91b 100644
--- a/src/Rtmp/Rtmp.h
+++ b/src/Rtmp/Rtmp.h
@@ -325,7 +325,7 @@ public:
               const map<string,string> &header = map<string,string>()){
         _metadata.set("duration", dur_sec);
         _metadata.set("fileSize", 0);
-        _metadata.set("server","ZLMediaKit");
+        _metadata.set("server",SERVER_NAME);
         for (auto &pr : header){
             _metadata.set(pr.first, pr.second);
         }
diff --git a/src/Rtsp/Rtsp.cpp b/src/Rtsp/Rtsp.cpp
index d6415231..716913ea 100644
--- a/src/Rtsp/Rtsp.cpp
+++ b/src/Rtsp/Rtsp.cpp
@@ -108,8 +108,7 @@ string SdpTrack::toString() const {
                 _printer << "t=" << _t << "\r\n";
             }
 
-            _printer << "s=RTSP Session, streamed by the ZLMediaKit\r\n";
-            _printer << "i=ZLMediaKit Live Stream\r\n";
+            _printer << "s=Streamed by " << SERVER_NAME << "\r\n";
             getAttrSdp(_attr,_printer);
         }
             break;
diff --git a/src/Rtsp/Rtsp.h b/src/Rtsp/Rtsp.h
index c428f2e4..48204939 100644
--- a/src/Rtsp/Rtsp.h
+++ b/src/Rtsp/Rtsp.h
@@ -258,17 +258,17 @@ public:
                 _printer << pr.first << "=" << pr.second << "\r\n";
             }
         } else {
-            _printer << "o=- 1383190487994921 1 IN IP4 0.0.0.0\r\n";
-            _printer << "s=RTSP Session, streamed by the ZLMediaKit\r\n";
-            _printer << "i=ZLMediaKit Live Stream\r\n";
+            _printer << "o=- 0 0 IN IP4 0.0.0.0\r\n";
+            _printer << "s=Streamed by " << SERVER_NAME << "\r\n";
             _printer << "c=IN IP4 0.0.0.0\r\n";
             _printer << "t=0 0\r\n";
         }
 
         if(dur_sec <= 0){
+            //直播
             _printer << "a=range:npt=now-\r\n";
         }else{
-            //点播情况下,vlc不支持支持npt=now-xxx, 但是貌似echo show只支持npt=now-xxx ?
+            //点播
             _printer << "a=range:npt=0-" << dur_sec  << "\r\n";
         }
         _printer << "a=control:*\r\n";
diff --git a/src/Rtsp/RtspMediaSource.h b/src/Rtsp/RtspMediaSource.h
index d191cad5..32386835 100644
--- a/src/Rtsp/RtspMediaSource.h
+++ b/src/Rtsp/RtspMediaSource.h
@@ -133,7 +133,7 @@ public:
             case 1:
                 return tracks[0]->_time_stamp;
             default:
-                return MAX(tracks[0]->_time_stamp, tracks[1]->_time_stamp);
+                return MIN(tracks[0]->_time_stamp, tracks[1]->_time_stamp);
         }
     }
 
diff --git a/src/Rtsp/RtspPlayer.cpp b/src/Rtsp/RtspPlayer.cpp
index 1cbc0eaa..377d8e41 100644
--- a/src/Rtsp/RtspPlayer.cpp
+++ b/src/Rtsp/RtspPlayer.cpp
@@ -668,7 +668,7 @@ void RtspPlayer::sendRtspRequest(const string &cmd, const string &url, const std
 void RtspPlayer::sendRtspRequest(const string &cmd, const string &url,const StrCaseMap &header_const) {
     auto header = header_const;
     header.emplace("CSeq",StrPrinter << _uiCseq++);
-    header.emplace("User-Agent",SERVER_NAME "(build in " __DATE__ " " __TIME__ ")");
+    header.emplace("User-Agent",SERVER_NAME);
 
     if(!_strSession.empty()){
         header.emplace("Session",_strSession);
diff --git a/src/Rtsp/RtspPusher.cpp b/src/Rtsp/RtspPusher.cpp
index 7dd6a61f..84afca73 100644
--- a/src/Rtsp/RtspPusher.cpp
+++ b/src/Rtsp/RtspPusher.cpp
@@ -398,7 +398,7 @@ void RtspPusher::sendRtspRequest(const string &cmd, const string &url, const std
 void RtspPusher::sendRtspRequest(const string &cmd, const string &url,const StrCaseMap &header_const,const string &sdp ) {
     auto header = header_const;
     header.emplace("CSeq",StrPrinter << _uiCseq++);
-    header.emplace("User-Agent",SERVER_NAME "(build in " __DATE__ " " __TIME__ ")");
+    header.emplace("User-Agent",SERVER_NAME);
 
     if(!_strSession.empty()){
         header.emplace("Session",_strSession);
diff --git a/src/Rtsp/RtspSession.cpp b/src/Rtsp/RtspSession.cpp
index 0c2e3f1a..35d023e3 100644
--- a/src/Rtsp/RtspSession.cpp
+++ b/src/Rtsp/RtspSession.cpp
@@ -795,7 +795,7 @@ void RtspSession::handleReq_Play(const Parser &parser) {
         rtp_info.pop_back();
 
         sendRtspResponse("200 OK",
-                         {"Range", StrPrinter << "npt=" << setiosflags(ios::fixed) << setprecision(2) <<  pMediaSrc->getTimeStamp(TrackInvalid) / 1000.0,
+                         {"Range", StrPrinter << "npt=" << setiosflags(ios::fixed) << setprecision(2) <<  pMediaSrc->getTimeStamp(TrackInvalid) / 1000.0 << "-",
                           "RTP-Info",rtp_info
                          });
 
@@ -1033,7 +1033,7 @@ bool RtspSession::sendRtspResponse(const string &res_code,
         header.emplace("Session",_strSession);
     }
 
-    header.emplace("Server",SERVER_NAME "(build in " __DATE__ " " __TIME__ ")");
+    header.emplace("Server",SERVER_NAME);
     header.emplace("Date",dateStr());
 
     if(!sdp.empty()){
diff --git a/src/Rtsp/RtspSession.h b/src/Rtsp/RtspSession.h
index 3747fda8..99c09f2b 100644
--- a/src/Rtsp/RtspSession.h
+++ b/src/Rtsp/RtspSession.h
@@ -236,8 +236,6 @@ private:
     RtcpCounter _aRtcpCnt[2];
     //rtcp发送时间,trackid idx 为数组下标
     Ticker _aRtcpTicker[2];
-    //时间戳修整器
-    Stamp _stamp[2];
 };
 
 /**