diff --git a/src/Rtsp/RtpReceiver.h b/src/Rtsp/RtpReceiver.h
index 8b6f7fed..089f36fe 100644
--- a/src/Rtsp/RtpReceiver.h
+++ b/src/Rtsp/RtpReceiver.h
@@ -236,7 +236,8 @@ public:
      * @param len rtp数据指针长度
      * @return 解析成功返回true
      */
-    bool handleOneRtp(int index, TrackType type, int sample_rate, uint8_t *ptr, size_t len){
+    bool handleOneRtp(int index, TrackType type, int sample_rate, uint8_t *ptr, size_t len) {
+        assert(index < kCount && index >= 0);
         return _track[index].inputRtp(type, sample_rate, ptr, len).operator bool();
     }
 
@@ -247,7 +248,8 @@ public:
      * @param rtp_stamp rtp时间戳
      * @param ntp_stamp_ms ntp时间戳
      */
-    void setNtpStamp(int index, uint32_t rtp_stamp, uint64_t ntp_stamp_ms){
+    void setNtpStamp(int index, uint32_t rtp_stamp, uint64_t ntp_stamp_ms) {
+        assert(index < kCount && index >= 0);
         _track[index].setNtpStamp(rtp_stamp, ntp_stamp_ms);
     }
 
@@ -258,14 +260,17 @@ public:
     }
 
     size_t getJitterSize(int index) const {
+        assert(index < kCount && index >= 0);
         return _track[index].getJitterSize();
     }
 
     size_t getCycleCount(int index) const {
+        assert(index < kCount && index >= 0);
         return _track[index].getCycleCount();
     }
 
     uint32_t getSSRC(int index) const {
+        assert(index < kCount && index >= 0);
         return _track[index].getSSRC();
     }
 
diff --git a/src/Rtsp/RtspPlayer.cpp b/src/Rtsp/RtspPlayer.cpp
index 33dc548d..8e584de6 100644
--- a/src/Rtsp/RtspPlayer.cpp
+++ b/src/Rtsp/RtspPlayer.cpp
@@ -693,7 +693,7 @@ void RtspPlayer::onPlayResult_l(const SockException &ex , bool handshake_done) {
 }
 
 int RtspPlayer::getTrackIndexByInterleaved(int interleaved) const {
-    for (unsigned int i = 0; i < _sdp_track.size(); i++) {
+    for (size_t i = 0; i < _sdp_track.size(); ++i) {
         if (_sdp_track[i]->_interleaved == interleaved) {
             return i;
         }
@@ -705,7 +705,7 @@ int RtspPlayer::getTrackIndexByInterleaved(int interleaved) const {
 }
 
 int RtspPlayer::getTrackIndexByTrackType(TrackType track_type) const {
-    for (unsigned int i = 0; i < _sdp_track.size(); i++) {
+    for (size_t i = 0; i < _sdp_track.size(); ++i) {
         if (_sdp_track[i]->_type == track_type) {
             return i;
         }
@@ -713,7 +713,7 @@ int RtspPlayer::getTrackIndexByTrackType(TrackType track_type) const {
     if (_sdp_track.size() == 1) {
         return 0;
     }
-    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << (int) track_type);
+    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << getTrackString(track_type));
 }
 
 } /* namespace mediakit */
diff --git a/src/Rtsp/RtspPusher.cpp b/src/Rtsp/RtspPusher.cpp
index 8b7226bd..ab628210 100644
--- a/src/Rtsp/RtspPusher.cpp
+++ b/src/Rtsp/RtspPusher.cpp
@@ -419,7 +419,7 @@ void RtspPusher::sendRtpPacket(const RtspMediaSource::RingDataType &pkt) {
 }
 
 int RtspPusher::getTrackIndexByInterleaved(int interleaved) const {
-    for (int i = 0; i < (int)_track_vec.size(); ++i) {
+    for (size_t i = 0; i < _track_vec.size(); ++i) {
         if (_track_vec[i]->_interleaved == interleaved) {
             return i;
         }
@@ -430,8 +430,8 @@ int RtspPusher::getTrackIndexByInterleaved(int interleaved) const {
     throw SockException(Err_shutdown, StrPrinter << "no such track with interleaved:" << interleaved);
 }
 
-int RtspPusher::getTrackIndexByTrackType(TrackType type) const{
-    for (int i = 0; i < (int)_track_vec.size(); ++i) {
+int RtspPusher::getTrackIndexByTrackType(TrackType type) const {
+    for (size_t i = 0; i < _track_vec.size(); ++i) {
         if (type == _track_vec[i]->_type) {
             return i;
         }
@@ -439,7 +439,7 @@ int RtspPusher::getTrackIndexByTrackType(TrackType type) const{
     if (_track_vec.size() == 1) {
         return 0;
     }
-    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << (int) type);
+    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << getTrackString(type));
 }
 
 void RtspPusher::sendRecord() {
diff --git a/src/Rtsp/RtspSession.cpp b/src/Rtsp/RtspSession.cpp
index 536df225..f0a7a608 100644
--- a/src/Rtsp/RtspSession.cpp
+++ b/src/Rtsp/RtspSession.cpp
@@ -1098,36 +1098,36 @@ bool RtspSession::sendRtspResponse(const string &res_code, const std::initialize
 }
 
 int RtspSession::getTrackIndexByTrackType(TrackType type) {
-    for (unsigned int i = 0; i < _sdp_track.size(); i++) {
+    for (size_t i = 0; i < _sdp_track.size(); ++i) {
         if (type == _sdp_track[i]->_type) {
             return i;
         }
     }
-    if(_sdp_track.size() == 1){
+    if (_sdp_track.size() == 1) {
         return 0;
     }
-    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << (int) type);
+    throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << getTrackString(type));
 }
 
 int RtspSession::getTrackIndexByControlUrl(const string &control_url) {
-    for (unsigned int i = 0; i < _sdp_track.size(); i++) {
+    for (size_t i = 0; i < _sdp_track.size(); ++i) {
         if (control_url == _sdp_track[i]->getControlUrl(_content_base)) {
             return i;
         }
     }
-    if(_sdp_track.size() == 1){
+    if (_sdp_track.size() == 1) {
         return 0;
     }
     throw SockException(Err_shutdown, StrPrinter << "no such track with control url:" << control_url);
 }
 
-int RtspSession::getTrackIndexByInterleaved(int interleaved){
-    for (unsigned int i = 0; i < _sdp_track.size(); i++) {
+int RtspSession::getTrackIndexByInterleaved(int interleaved) {
+    for (size_t i = 0; i < _sdp_track.size(); ++i) {
         if (_sdp_track[i]->_interleaved == interleaved) {
             return i;
         }
     }
-    if(_sdp_track.size() == 1){
+    if (_sdp_track.size() == 1) {
         return 0;
     }
     throw SockException(Err_shutdown, StrPrinter << "no such track with interleaved:" << interleaved);