diff --git a/README.md b/README.md
index a3d2faae..56f29476 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@
 - 极致体验，[独家特性](https://github.com/ZLMediaKit/ZLMediaKit/wiki/ZLMediakit%E7%8B%AC%E5%AE%B6%E7%89%B9%E6%80%A7%E4%BB%8B%E7%BB%8D)
 - [谁在使用zlmediakit?](https://github.com/ZLMediaKit/ZLMediaKit/issues/511)
 - 全面支持ipv6网络
+- 支持多轨道模式(一个流中多个视频/音频)
 
 ## 项目定位
 
@@ -76,16 +77,19 @@
   - 通过cookie追踪技术，可以模拟HLS播放为长连接，可以实现HLS按需拉流、播放统计等业务
   - 支持HLS播发器，支持拉流HLS转rtsp/rtmp/mp4
   - 支持H264/H265/AAC/G711/OPUS编码
+  - 支持多轨道模式
   
 - TS
   - 支持http[s]-ts直播
   - 支持ws[s]-ts直播
   - 支持H264/H265/AAC/G711/OPUS编码
+  - 支持多轨道模式
   
 - fMP4
   - 支持http[s]-fmp4直播
   - 支持ws[s]-fmp4直播
   - 支持H264/H265/AAC/G711/OPUS/MJPEG编码
+  - 支持多轨道模式
 
 - HTTP[S]与WebSocket
   - 服务器支持`目录索引生成`,`文件下载`,`表单提交请求`
@@ -104,11 +108,13 @@
   - 支持es/ps rtp转推
   - 支持GB28181主动拉流模式
   - 支持双向语音对讲
+  - 支持多轨道模式
 
 - MP4点播与录制
   - 支持录制为FLV/HLS/MP4
   - RTSP/RTMP/HTTP-FLV/WS-FLV支持MP4文件点播，支持seek
   - 支持H264/H265/AAC/G711/OPUS编码
+  - 支持多轨道模式
   
 - WebRTC
   - 支持WebRTC推流，支持转其他协议
diff --git a/server/WebApi.cpp b/server/WebApi.cpp
index 0985604f..c80774cc 100755
--- a/server/WebApi.cpp
+++ b/server/WebApi.cpp
@@ -1818,6 +1818,8 @@ void installWebApi() {
         CHECK_ARGS("vhost", "app", "stream", "file_path");
 
         ProtocolOption option;
+        // mp4支持多track
+        option.max_track = 16;
         // 默认解复用mp4不生成mp4
         option.enable_mp4 = false;
         // 但是如果参数明确指定开启mp4, 那么也允许之
diff --git a/src/Common/MediaSink.cpp b/src/Common/MediaSink.cpp
index adae1738..3fc5a9ea 100644
--- a/src/Common/MediaSink.cpp
+++ b/src/Common/MediaSink.cpp
@@ -12,6 +12,8 @@
 #include "Common/config.h"
 #include "Extension/Factory.h"
 
+#define MUTE_AUDIO_INDEX 0xFFFF
+
 using namespace std;
 
 namespace mediakit{
@@ -33,28 +35,30 @@ bool MediaSink::addTrack(const Track::Ptr &track_in) {
         WarnL << "All track is ready, add track too late: " << track_in->getCodecName();
         return false;
     }
-    //克隆Track，只拷贝其数据，不拷贝其数据转发关系
+    // 克隆Track，只拷贝其数据，不拷贝其数据转发关系
     auto track = track_in->clone();
-    auto track_type = track->getTrackType();
-    _track_map[track_type] = std::make_pair(track, false);
-    _track_ready_callback[track_type] = [this, track]() {
-        onTrackReady(track);
-    };
+    auto index = track->getIndex();
+    if (!_track_map.emplace(index, std::make_pair(track, false)).second) {
+        WarnL << "Already add a same track: " << track->getIndex() << ", codec: " << track->getCodecName();
+        return false;
+    }
     _ticker.resetTime();
+    _audio_add = track->getTrackType() == TrackAudio ? true : _audio_add;
+    _track_ready_callback[index] = [this, track]() { onTrackReady(track); };
 
     track->addDelegate([this](const Frame::Ptr &frame) {
         if (_all_track_ready) {
             return onTrackFrame(frame);
         }
-        auto &frame_unread = _frame_unread[frame->getTrackType()];
+        auto &frame_unread = _frame_unread[frame->getIndex()];
 
         GET_CONFIG(uint32_t, kMaxUnreadyFrame, General::kUnreadyFrameCache);
         if (frame_unread.size() > kMaxUnreadyFrame) {
-            //未就绪的的track，不能缓存太多的帧，否则可能内存溢出
+            // 未就绪的的track，不能缓存太多的帧，否则可能内存溢出
             frame_unread.clear();
             WarnL << "Cached frame of unready track(" << frame->getCodecName() << ") is too much, now cleared";
         }
-        //还有Track未就绪，先缓存之
+        // 还有Track未就绪，先缓存之
         frame_unread.emplace_back(Frame::getCacheAbleFrame(frame));
         return true;
     });
@@ -62,36 +66,37 @@ bool MediaSink::addTrack(const Track::Ptr &track_in) {
 }
 
 void MediaSink::resetTracks() {
-    _all_track_ready = false;
+    _audio_add = false;
     _have_video = false;
-    _track_map.clear();
-    _track_ready_callback.clear();
+    _all_track_ready = false;
+    _mute_audio_maker = nullptr;
     _ticker.resetTime();
-    _max_track_size = 2;
+    _track_map.clear();
     _frame_unread.clear();
+    _track_ready_callback.clear();
 }
 
 bool MediaSink::inputFrame(const Frame::Ptr &frame) {
-    auto it = _track_map.find(frame->getTrackType());
+    auto it = _track_map.find(frame->getIndex());
     if (it == _track_map.end()) {
         return false;
     }
-    //got frame
+    // got frame
     it->second.second = true;
     auto ret = it->second.first->inputFrame(frame);
     if (_mute_audio_maker && frame->getTrackType() == TrackVideo) {
-        //视频驱动产生静音音频
+        // 视频驱动产生静音音频
         _mute_audio_maker->inputFrame(frame);
     }
     checkTrackIfReady();
     return ret;
 }
 
-void MediaSink::checkTrackIfReady(){
+void MediaSink::checkTrackIfReady() {
     if (!_all_track_ready && !_track_ready_callback.empty()) {
         for (auto &pr : _track_map) {
             if (pr.second.second && pr.second.first->ready()) {
-                //Track由未就绪状态转换成就绪状态，我们就触发onTrackReady回调
+                // Track由未就绪状态转换成就绪状态，我们就触发onTrackReady回调
                 auto it = _track_ready_callback.find(pr.first);
                 if (it != _track_ready_callback.end()) {
                     it->second();
@@ -101,28 +106,34 @@ void MediaSink::checkTrackIfReady(){
         }
     }
 
-    if(!_all_track_ready){
+    if (!_all_track_ready) {
         GET_CONFIG(uint32_t, kMaxWaitReadyMS, General::kWaitTrackReadyMS);
-        if(_ticker.elapsedTime() > kMaxWaitReadyMS){
-            //如果超过规定时间，那么不再等待并忽略未准备好的Track
+        if (_ticker.elapsedTime() > kMaxWaitReadyMS) {
+            // 如果超过规定时间，那么不再等待并忽略未准备好的Track
             emitAllTrackReady();
             return;
         }
 
-        if(!_track_ready_callback.empty()){
-            //在超时时间内，如果存在未准备好的Track，那么继续等待
+        if (!_track_ready_callback.empty()) {
+            // 在超时时间内，如果存在未准备好的Track，那么继续等待
             return;
         }
 
-        if(_track_map.size() == _max_track_size){
-            //如果已经添加了音视频Track，并且不存在未准备好的Track，那么说明所有Track都准备好了
+        if (_only_audio && _audio_add) {
+            // 只开启音频
+            emitAllTrackReady();
+            return;
+        }
+
+        if (_track_map.size() == _max_track_size) {
+            // 如果已经添加了音视频Track，并且不存在未准备好的Track，那么说明所有Track都准备好了
             emitAllTrackReady();
             return;
         }
 
         GET_CONFIG(uint32_t, kMaxAddTrackMS, General::kWaitAddTrackMS);
-        if(_track_map.size() == 1 && _ticker.elapsedTime() > kMaxAddTrackMS){
-            //如果只有一个Track，那么在该Track添加后，我们最多还等待若干时间(可能后面还会添加Track)
+        if (_track_map.size() == 1 && _ticker.elapsedTime() > kMaxAddTrackMS) {
+            // 如果只有一个Track，那么在该Track添加后，我们最多还等待若干时间(可能后面还会添加Track)
             emitAllTrackReady();
             return;
         }
@@ -138,7 +149,7 @@ void MediaSink::setMaxTrackCount(size_t i) {
         WarnL << "All track is ready, set max track count ignored";
         return;
     }
-    _max_track_size = MAX(MIN(i, 2), 1);
+    _max_track_size = MAX(i, 1);
     checkTrackIfReady();
 }
 
@@ -149,9 +160,9 @@ void MediaSink::emitAllTrackReady() {
 
     DebugL << "All track ready use " << _ticker.elapsedTime() << "ms";
     if (!_track_ready_callback.empty()) {
-        //这是超时强制忽略未准备好的Track
+        // 这是超时强制忽略未准备好的Track
         _track_ready_callback.clear();
-        //移除未准备好的Track
+        // 移除未准备好的Track
         for (auto it = _track_map.begin(); it != _track_map.end();) {
             if (!it->second.second || !it->second.first->ready()) {
                 WarnL << "Track not ready for a long time, ignored: " << it->second.first->getCodecName();
@@ -163,25 +174,23 @@ void MediaSink::emitAllTrackReady() {
     }
 
     if (!_track_map.empty()) {
-        //最少有一个有效的Track
+        // 最少有一个有效的Track
         onAllTrackReady_l();
 
-        //全部Track就绪，我们一次性把之前的帧输出
-        for(auto &pr : _frame_unread){
+        // 全部Track就绪，我们一次性把之前的帧输出
+        for (auto &pr : _frame_unread) {
             if (_track_map.find(pr.first) == _track_map.end()) {
-                //该Track已经被移除
+                // 该Track已经被移除
                 continue;
             }
-            pr.second.for_each([&](const Frame::Ptr &frame) {
-                MediaSink::inputFrame(frame);
-            });
+            pr.second.for_each([&](const Frame::Ptr &frame) { MediaSink::inputFrame(frame); });
         }
         _frame_unread.clear();
     }
 }
 
 void MediaSink::onAllTrackReady_l() {
-    //是否添加静音音频
+    // 是否添加静音音频
     if (_add_mute_audio) {
         addMuteAudioTrack();
     }
@@ -190,10 +199,10 @@ void MediaSink::onAllTrackReady_l() {
     _have_video = (bool)getTrack(TrackVideo);
 }
 
-vector<Track::Ptr> MediaSink::getTracks(bool ready) const{
+vector<Track::Ptr> MediaSink::getTracks(bool ready) const {
     vector<Track::Ptr> ret;
-    for (auto &pr : _track_map){
-        if(ready && !pr.second.first->ready()){
+    for (auto &pr : _track_map) {
+        if (ready && !pr.second.first->ready()) {
             continue;
         }
         ret.emplace_back(pr.second.first);
@@ -230,14 +239,20 @@ static uint8_t s_mute_adts[] = {0xff, 0xf1, 0x6c, 0x40, 0x2d, 0x3f, 0xfc, 0x00,
 static uint8_t ADTS_CONFIG[2] = { 0x15, 0x88 };
 
 bool MuteAudioMaker::inputFrame(const Frame::Ptr &frame) {
-    if (frame->getTrackType() == TrackVideo) {
-        auto audio_idx = frame->dts() / MUTE_ADTS_DATA_MS;
-        if (_audio_idx != audio_idx) {
-            _audio_idx = audio_idx;
-            auto aacFrame = std::make_shared<FrameToCache<FrameFromPtr>>(CodecAAC, (char *) MUTE_ADTS_DATA, sizeof(s_mute_adts),
-                                                                         _audio_idx * MUTE_ADTS_DATA_MS, 0, 7);
-            return FrameDispatcher::inputFrame(aacFrame);
-        }
+    if (_track_index == -1) {
+        // 锁定track
+        _track_index = frame->getIndex();
+    }
+    if (frame->getIndex() != _track_index) {
+        // 不是锁定的track
+        return false;
+    }
+    auto audio_idx = frame->dts() / MUTE_ADTS_DATA_MS;
+    if (_audio_idx != audio_idx) {
+        _audio_idx = audio_idx;
+        auto aacFrame = std::make_shared<FrameToCache<FrameFromPtr>>(CodecAAC, (char *)MUTE_ADTS_DATA, sizeof(s_mute_adts), _audio_idx * MUTE_ADTS_DATA_MS, 0, 7);
+        aacFrame->setIndex(MUTE_AUDIO_INDEX);
+        return FrameDispatcher::inputFrame(aacFrame);
     }
     return false;
 }
@@ -246,19 +261,18 @@ bool MediaSink::addMuteAudioTrack() {
     if (!_enable_audio) {
         return false;
     }
-    if (_track_map.find(TrackAudio) != _track_map.end()) {
-        return false;
+    for (auto &pr : _track_map) {
+        if (pr.second.first->getTrackType() == TrackAudio) {
+            return false;
+        }
     }
     auto audio = Factory::getTrackByCodecId(CodecAAC);
+    audio->setIndex(MUTE_AUDIO_INDEX);
     audio->setExtraData(ADTS_CONFIG, 2);
-    _track_map[audio->getTrackType()] = std::make_pair(audio, true);
-    audio->addDelegate([this](const Frame::Ptr &frame) {
-        return onTrackFrame(frame);
-    });
+    _track_map[MUTE_AUDIO_INDEX] = std::make_pair(audio, true);
+    audio->addDelegate([this](const Frame::Ptr &frame) { return onTrackFrame(frame); });
     _mute_audio_maker = std::make_shared<MuteAudioMaker>();
-    _mute_audio_maker->addDelegate([audio](const Frame::Ptr &frame) {
-        return audio->inputFrame(frame);
-    });
+    _mute_audio_maker->addDelegate([audio](const Frame::Ptr &frame) { return audio->inputFrame(frame); });
     onTrackReady(audio);
     TraceL << "Mute aac track added";
     return true;
@@ -270,14 +284,12 @@ bool MediaSink::isAllTrackReady() const {
 
 void MediaSink::enableAudio(bool flag) {
     _enable_audio = flag;
-    _max_track_size = flag ? 2 : 1;
 }
 
-void MediaSink::setOnlyAudio(){
+void MediaSink::setOnlyAudio() {
     _only_audio = true;
     _enable_audio = true;
     _add_mute_audio = false;
-    _max_track_size = 1;
 }
 
 void MediaSink::enableMuteAudio(bool flag) {
@@ -332,9 +344,7 @@ bool Demuxer::addTrack(const Track::Ptr &track) {
     }
 
     if (_sink->addTrack(track)) {
-        track->addDelegate([this](const Frame::Ptr &frame) {
-            return _sink->inputFrame(frame);
-        });
+        track->addDelegate([this](const Frame::Ptr &frame) { return _sink->inputFrame(frame); });
         return true;
     }
     return false;
@@ -370,4 +380,4 @@ vector<Track::Ptr> Demuxer::getTracks(bool ready) const {
     }
     return ret;
 }
-}//namespace mediakit
+} // namespace mediakit
diff --git a/src/Common/MediaSink.h b/src/Common/MediaSink.h
index c3cd94d6..683878e3 100644
--- a/src/Common/MediaSink.h
+++ b/src/Common/MediaSink.h
@@ -55,6 +55,7 @@ public:
     bool inputFrame(const Frame::Ptr &frame) override;
 
 private:
+    int _track_index = -1;
     uint64_t _audio_idx = 0;
 };
 
@@ -86,7 +87,7 @@ public:
     void addTrackCompleted() override;
 
     /**
-     * 设置最大track数，取值范围1~2；该方法与addTrackCompleted类型；
+     * 设置最大track数，取值范围>=1；该方法与addTrackCompleted类型；
      * 在设置单track时，可以加快媒体注册速度
      */
     void setMaxTrackCount(size_t i);
@@ -163,17 +164,20 @@ private:
     bool addMuteAudioTrack();
 
 private:
+    bool _audio_add = false;
+    bool _have_video = false;
     bool _enable_audio = true;
     bool _only_audio = false;
     bool _add_mute_audio = true;
     bool _all_track_ready = false;
-    bool _have_video = false;
     size_t _max_track_size = 2;
-    std::unordered_map<int, std::pair<Track::Ptr, bool/*got frame*/> > _track_map;
-    std::unordered_map<int, toolkit::List<Frame::Ptr> > _frame_unread;
-    std::unordered_map<int, std::function<void()> > _track_ready_callback;
+
     toolkit::Ticker _ticker;
     MuteAudioMaker::Ptr _mute_audio_maker;
+
+    std::unordered_map<int, toolkit::List<Frame::Ptr> > _frame_unread;
+    std::unordered_map<int, std::function<void()> > _track_ready_callback;
+    std::unordered_map<int, std::pair<Track::Ptr, bool/*got frame*/> > _track_map;
 };
 
 
diff --git a/src/Common/MediaSource.h b/src/Common/MediaSource.h
index 7d423f0b..4c6b33e9 100644
--- a/src/Common/MediaSource.h
+++ b/src/Common/MediaSource.h
@@ -202,6 +202,9 @@ public:
     // 支持通过on_publish返回值替换stream_id
     std::string stream_replace;
 
+    // 最大track数
+    size_t max_track = 2;
+
     template <typename MAP>
     ProtocolOption(const MAP &allArgs) : ProtocolOption() {
         load(allArgs);
@@ -237,6 +240,7 @@ public:
 
         GET_OPT_VALUE(hls_save_path);
         GET_OPT_VALUE(stream_replace);
+        GET_OPT_VALUE(max_track);
     }
 
 private:
diff --git a/src/Common/MultiMediaSourceMuxer.cpp b/src/Common/MultiMediaSourceMuxer.cpp
index 0e91fe30..5b3b8d72 100644
--- a/src/Common/MultiMediaSourceMuxer.cpp
+++ b/src/Common/MultiMediaSourceMuxer.cpp
@@ -177,11 +177,8 @@ MultiMediaSourceMuxer::MultiMediaSourceMuxer(const MediaTuple& tuple, float dur_
     _poller = EventPollerPool::Instance().getPoller();
     _create_in_poller = _poller->isCurrentThread();
     _option = option;
-    if (dur_sec > 0.01) {
-        // 点播
-        _stamp[TrackVideo].setPlayBack();
-        _stamp[TrackAudio].setPlayBack();
-    }
+    _dur_sec = dur_sec;
+    setMaxTrackCount(option.max_track);
 
     if (option.enable_rtmp) {
         _rtmp = std::make_shared<RtmpMediaSourceMuxer>(_tuple, option, std::make_shared<TitleMeta>(dur_sec));
@@ -464,6 +461,12 @@ std::shared_ptr<MultiMediaSourceMuxer> MultiMediaSourceMuxer::getMuxer(MediaSour
 }
 
 bool MultiMediaSourceMuxer::onTrackReady(const Track::Ptr &track) {
+    auto &stamp = _stamps[track->getIndex()];
+    if (_dur_sec > 0.01) {
+        // 点播
+        stamp.setPlayBack();
+    }
+
     bool ret = false;
     if (_rtmp) {
         ret = _rtmp->addTrack(track) ? true : ret;
@@ -536,10 +539,14 @@ void MultiMediaSourceMuxer::onAllTrackReady() {
         createGopCacheIfNeed();
     }
 #endif
-    auto tracks = getTracks(false);
-    if (tracks.size() >= 2) {
-        // 音频时间戳同步于视频，因为音频时间戳被修改后不影响播放
-        _stamp[TrackAudio].syncTo(_stamp[TrackVideo]);
+
+    Stamp *first = nullptr;
+    for (auto &pr : _stamps) {
+        if (!first) {
+            first = &pr.second;
+        } else {
+            pr.second.syncTo(*first);
+        }
     }
     InfoL << "stream: " << shortUrl() << " , codec info: " << getTrackInfoStr(this);
 }
@@ -589,7 +596,7 @@ void MultiMediaSourceMuxer::resetTracks() {
 bool MultiMediaSourceMuxer::onTrackFrame(const Frame::Ptr &frame) {
     if (_option.modify_stamp != ProtocolOption::kModifyStampOff) {
         // 时间戳不采用原始的绝对时间戳
-        const_cast<Frame::Ptr&>(frame) = std::make_shared<FrameStamp>(frame, _stamp[frame->getTrackType()], _option.modify_stamp);
+        const_cast<Frame::Ptr&>(frame) = std::make_shared<FrameStamp>(frame, _stamps[frame->getIndex()], _option.modify_stamp);
     }
     return _paced_sender ? _paced_sender->inputFrame(frame) : onTrackFrame_l(frame);
 }
diff --git a/src/Common/MultiMediaSourceMuxer.h b/src/Common/MultiMediaSourceMuxer.h
index 5a6adf12..9ca34370 100644
--- a/src/Common/MultiMediaSourceMuxer.h
+++ b/src/Common/MultiMediaSourceMuxer.h
@@ -162,11 +162,12 @@ private:
     bool _is_enable = false;
     bool _create_in_poller = false;
     bool _video_key_pos = false;
+    float _dur_sec;
     std::shared_ptr<class FramePacedSender> _paced_sender;
     MediaTuple _tuple;
     ProtocolOption _option;
     toolkit::Ticker _last_check;
-    Stamp _stamp[2];
+    std::unordered_map<int, Stamp> _stamps;
     std::weak_ptr<Listener> _track_listener;
     std::unordered_multimap<std::string, RingType::RingReader::Ptr> _rtp_sender;
     FMP4MediaSourceMuxer::Ptr _fmp4;
diff --git a/src/Extension/AAC.cpp b/src/Extension/AAC.cpp
index ee4ad947..148504ac 100644
--- a/src/Extension/AAC.cpp
+++ b/src/Extension/AAC.cpp
@@ -275,6 +275,7 @@ static Frame::Ptr addADTSHeader(const Frame::Ptr &frame_in, const std::string &a
     frame->_dts = frame_in->dts();
     frame->_buffer.assign(adts_header, size);
     frame->_buffer.append(frame_in->data(), frame_in->size());
+    frame->setIndex(frame_in->getIndex());
     return frame;
 }
 
diff --git a/src/Extension/Frame.cpp b/src/Extension/Frame.cpp
index 5b01d1ca..27973f9f 100644
--- a/src/Extension/Frame.cpp
+++ b/src/Extension/Frame.cpp
@@ -42,6 +42,7 @@ Frame::Ptr Frame::getCacheAbleFrame(const Frame::Ptr &frame){
 
 FrameStamp::FrameStamp(Frame::Ptr frame, Stamp &stamp, int modify_stamp)
 {
+    setIndex(frame->getIndex());
     _frame = std::move(frame);
     // kModifyStampSystem时采用系统时间戳，kModifyStampRelative采用相对时间戳
     stamp.revise(_frame->dts(), _frame->pts(), _dts, _pts, modify_stamp == ProtocolOption::kModifyStampSystem);
diff --git a/src/Extension/Frame.h b/src/Extension/Frame.h
index 1bdf526c..da55e8fe 100644
--- a/src/Extension/Frame.h
+++ b/src/Extension/Frame.h
@@ -123,7 +123,24 @@ public:
      * 获取音视频类型
      */
     TrackType getTrackType() const;
+
+    /**
+     * 获取音视频类型描述
+     */
     std::string getTrackTypeStr() const;
+
+    /**
+     * 设置track index, 用于支持多track
+     */
+    void setIndex(int index) { _index = index; }
+
+    /**
+     * 获取track index, 用于支持多track
+     */
+    int getIndex() const { return _index < 0 ? (int)getTrackType() : _index; }
+
+private:
+    int _index = -1;
 };
 
 /**
@@ -302,6 +319,7 @@ public:
     FrameInternalBase(Frame::Ptr parent_frame, char *ptr, size_t size, uint64_t dts, uint64_t pts = 0, size_t prefix_size = 0)
         : Parent(parent_frame->getCodecId(), ptr, size, dts, pts, prefix_size) {
         _parent_frame = std::move(parent_frame);
+        this->setIndex(_parent_frame->getIndex());
     }
 
     bool cacheAble() const override { return _parent_frame->cacheAble(); }
@@ -353,6 +371,7 @@ public:
     using Ptr = std::shared_ptr<FrameCacheAble>;
 
     FrameCacheAble(const Frame::Ptr &frame, bool force_key_frame = false, toolkit::Buffer::Ptr buf = nullptr) {
+        setIndex(frame->getIndex());
         if (frame->cacheAble()) {
             _ptr = frame->data();
             _buffer = frame;
diff --git a/src/Extension/H264.cpp b/src/Extension/H264.cpp
index 29931499..c147011e 100644
--- a/src/Extension/H264.cpp
+++ b/src/Extension/H264.cpp
@@ -285,6 +285,7 @@ void H264Track::insertConfigFrame(const Frame::Ptr &frame) {
         spsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
         spsFrame->_buffer.append(_sps);
         spsFrame->_dts = frame->dts();
+        spsFrame->setIndex(frame->getIndex());
         VideoTrack::inputFrame(spsFrame);
     }
 
@@ -294,6 +295,7 @@ void H264Track::insertConfigFrame(const Frame::Ptr &frame) {
         ppsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
         ppsFrame->_buffer.append(_pps);
         ppsFrame->_dts = frame->dts();
+        ppsFrame->setIndex(frame->getIndex());
         VideoTrack::inputFrame(ppsFrame);
     }
 }
diff --git a/src/Extension/H265.cpp b/src/Extension/H265.cpp
index fb62e508..e8daf399 100644
--- a/src/Extension/H265.cpp
+++ b/src/Extension/H265.cpp
@@ -195,6 +195,7 @@ void H265Track::insertConfigFrame(const Frame::Ptr &frame) {
         vpsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
         vpsFrame->_buffer.append(_vps);
         vpsFrame->_dts = frame->dts();
+        vpsFrame->setIndex(frame->getIndex());
         VideoTrack::inputFrame(vpsFrame);
     }
     if (!_sps.empty()) {
@@ -203,6 +204,7 @@ void H265Track::insertConfigFrame(const Frame::Ptr &frame) {
         spsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
         spsFrame->_buffer.append(_sps);
         spsFrame->_dts = frame->dts();
+        spsFrame->setIndex(frame->getIndex());
         VideoTrack::inputFrame(spsFrame);
     }
 
@@ -212,6 +214,7 @@ void H265Track::insertConfigFrame(const Frame::Ptr &frame) {
         ppsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
         ppsFrame->_buffer.append(_pps);
         ppsFrame->_dts = frame->dts();
+        ppsFrame->setIndex(frame->getIndex());
         VideoTrack::inputFrame(ppsFrame);
     }
 }
diff --git a/src/Extension/Track.h b/src/Extension/Track.h
index ec6d5cae..8264b3a8 100644
--- a/src/Extension/Track.h
+++ b/src/Extension/Track.h
@@ -34,7 +34,10 @@ public:
      * 复制拷贝，只能拷贝派生类的信息，
      * 环形缓存和代理关系不能拷贝，否则会关系紊乱
      */
-    Track(const Track &that) { _bit_rate = that._bit_rate; }
+    Track(const Track &that) {
+        _bit_rate = that._bit_rate;
+        setIndex(that.getIndex());
+    }
 
     /**
      * 是否准备好，准备好才能获取譬如sps pps等信息
diff --git a/src/Player/PlayerProxy.cpp b/src/Player/PlayerProxy.cpp
index a0a57ffe..0f31e33b 100644
--- a/src/Player/PlayerProxy.cpp
+++ b/src/Player/PlayerProxy.cpp
@@ -96,7 +96,16 @@ void PlayerProxy::setTranslationInfo()
     }
 }
 
+static int getMaxTrackSize(const std::string &url) {
+    if (url.find(".m3u8") != std::string::npos || url.find(".ts") != std::string::npos) {
+        // hls和ts协议才开放多track支持
+        return 16;
+    }
+    return 2;
+}
+
 void PlayerProxy::play(const string &strUrlTmp) {
+    _option.max_track = getMaxTrackSize(strUrlTmp);
     weak_ptr<PlayerProxy> weakSelf = shared_from_this();
     std::shared_ptr<int> piFailedCnt(new int(0)); // 连续播放失败次数
     setOnPlayResult([weakSelf, strUrlTmp, piFailedCnt](const SockException &err) {
diff --git a/src/Record/MP4Demuxer.cpp b/src/Record/MP4Demuxer.cpp
index 652ac8c4..4d6800d2 100644
--- a/src/Record/MP4Demuxer.cpp
+++ b/src/Record/MP4Demuxer.cpp
@@ -61,7 +61,8 @@ void MP4Demuxer::onVideoTrack(uint32_t track, uint8_t object, int width, int hei
     if (!video) {
         return;
     }
-    _track_to_codec.emplace(track, video);
+    video->setIndex(track);
+    _tracks.emplace(track, video);
     if (extra && bytes) {
         video->setExtraData((uint8_t *)extra, bytes);
     }
@@ -72,7 +73,8 @@ void MP4Demuxer::onAudioTrack(uint32_t track, uint8_t object, int channel_count,
     if (!audio) {
         return;
     }
-    _track_to_codec.emplace(track, audio);
+    audio->setIndex(track);
+    _tracks.emplace(track, audio);
     if (extra && bytes) {
         audio->setExtraData((uint8_t *)extra, bytes);
     }
@@ -134,8 +136,8 @@ Frame::Ptr MP4Demuxer::readFrame(bool &keyFrame, bool &eof) {
 }
 
 Frame::Ptr MP4Demuxer::makeFrame(uint32_t track_id, const Buffer::Ptr &buf, int64_t pts, int64_t dts) {
-    auto it = _track_to_codec.find(track_id);
-    if (it == _track_to_codec.end()) {
+    auto it = _tracks.find(track_id);
+    if (it == _tracks.end()) {
         return nullptr;
     }
     Frame::Ptr ret;
@@ -166,15 +168,16 @@ Frame::Ptr MP4Demuxer::makeFrame(uint32_t track_id, const Buffer::Ptr &buf, int6
         }
     }
     if (ret) {
+        ret->setIndex(track_id);
         it->second->inputFrame(ret);
     }
     return ret;
 }
 
-vector<Track::Ptr> MP4Demuxer::getTracks(bool trackReady) const {
+vector<Track::Ptr> MP4Demuxer::getTracks(bool ready) const {
     vector<Track::Ptr> ret;
-    for (auto &pr : _track_to_codec) {
-        if (trackReady && !pr.second->ready()) {
+    for (auto &pr : _tracks) {
+        if (ready && !pr.second->ready()) {
             continue;
         }
         ret.push_back(pr.second);
diff --git a/src/Record/MP4Demuxer.h b/src/Record/MP4Demuxer.h
index 166a1770..889f91fc 100644
--- a/src/Record/MP4Demuxer.h
+++ b/src/Record/MP4Demuxer.h
@@ -71,7 +71,7 @@ private:
     MP4FileDisk::Ptr _mp4_file;
     MP4FileDisk::Reader _mov_reader;
     uint64_t _duration_ms = 0;
-    std::map<int, Track::Ptr> _track_to_codec;
+    std::unordered_map<int, Track::Ptr> _tracks;
     toolkit::ResourcePool<toolkit::BufferRaw> _buffer_pool;
 };
 
diff --git a/src/Record/MP4Muxer.cpp b/src/Record/MP4Muxer.cpp
index c7490d99..37c6cfd7 100644
--- a/src/Record/MP4Muxer.cpp
+++ b/src/Record/MP4Muxer.cpp
@@ -60,7 +60,7 @@ bool MP4MuxerInterface::haveVideo() const {
 
 uint64_t MP4MuxerInterface::getDuration() const {
     uint64_t ret = 0;
-    for (auto &pr : _codec_to_trackid) {
+    for (auto &pr : _tracks) {
         if (pr.second.stamp.getRelativeStamp() > (int64_t)ret) {
             ret = pr.second.stamp.getRelativeStamp();
         }
@@ -72,61 +72,50 @@ void MP4MuxerInterface::resetTracks() {
     _started = false;
     _have_video = false;
     _mov_writter = nullptr;
-    _frame_merger.clear();
-    _codec_to_trackid.clear();
+    _tracks.clear();
 }
 
 void MP4MuxerInterface::flush() {
-    _frame_merger.flush();
+    for (auto &pr : _tracks) {
+        pr.second.merger.flush();
+    }
 }
 
 bool MP4MuxerInterface::inputFrame(const Frame::Ptr &frame) {
-    auto it = _codec_to_trackid.find(frame->getCodecId());
-    if (it == _codec_to_trackid.end()) {
-        //该Track不存在或初始化失败
+    auto it = _tracks.find(frame->getIndex());
+    if (it == _tracks.end()) {
+        // 该Track不存在或初始化失败
         return false;
     }
 
     if (!_started) {
-        //该逻辑确保含有视频时，第一帧为关键帧
+        // 该逻辑确保含有视频时，第一帧为关键帧
         if (_have_video && !frame->keyFrame()) {
-            //含有视频，但是不是关键帧，那么前面的帧丢弃
+            // 含有视频，但是不是关键帧，那么前面的帧丢弃
             return false;
         }
-        //开始写文件
+        // 开始写文件
         _started = true;
     }
 
-    //mp4文件时间戳需要从0开始
-    auto &track_info = it->second;
+    // mp4文件时间戳需要从0开始
+    auto &track = it->second;
     switch (frame->getCodecId()) {
         case CodecH264:
         case CodecH265: {
-            //这里的代码逻辑是让SPS、PPS、IDR这些时间戳相同的帧打包到一起当做一个帧处理，
-            _frame_merger.inputFrame(frame, [this, &track_info](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
+            // 这里的代码逻辑是让SPS、PPS、IDR这些时间戳相同的帧打包到一起当做一个帧处理，
+            track.merger.inputFrame(frame, [&](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
                 int64_t dts_out, pts_out;
-                track_info.stamp.revise(dts, pts, dts_out, pts_out);
-                mp4_writer_write(_mov_writter.get(),
-                                 track_info.track_id,
-                                 buffer->data(),
-                                 buffer->size(),
-                                 pts_out,
-                                 dts_out,
-                                 have_idr ? MOV_AV_FLAG_KEYFREAME : 0);
+                track.stamp.revise(dts, pts, dts_out, pts_out);
+                mp4_writer_write(_mov_writter.get(), track.track_id, buffer->data(), buffer->size(), pts_out, dts_out, have_idr ? MOV_AV_FLAG_KEYFREAME : 0);
             });
             break;
         }
 
         default: {
             int64_t dts_out, pts_out;
-            track_info.stamp.revise(frame->dts(), frame->pts(), dts_out, pts_out);
-            mp4_writer_write(_mov_writter.get(),
-                             track_info.track_id,
-                             frame->data() + frame->prefixSize(),
-                             frame->size() - frame->prefixSize(),
-                             pts_out,
-                             dts_out,
-                             frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0);
+            track.stamp.revise(frame->dts(), frame->pts(), dts_out, pts_out);
+            mp4_writer_write(_mov_writter.get(), track.track_id, frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize(), pts_out, dts_out, frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0);
             break;
         }
     }
@@ -134,23 +123,14 @@ bool MP4MuxerInterface::inputFrame(const Frame::Ptr &frame) {
 }
 
 void MP4MuxerInterface::stampSync() {
-    if (_codec_to_trackid.size() < 2) {
-        return;
-    }
-
-    Stamp *audio = nullptr, *video = nullptr;
-    for(auto &pr : _codec_to_trackid){
-        switch (getTrackType((CodecId) pr.first)){
-            case TrackAudio : audio = &pr.second.stamp; break;
-            case TrackVideo : video = &pr.second.stamp; break;
-            default : break;
+    Stamp *first = nullptr;
+    for (auto &pr : _tracks) {
+        if (!first) {
+            first = &pr.second.stamp;
+        } else {
+            pr.second.stamp.syncTo(*first);
         }
     }
-
-    if (audio && video) {
-        //音频时间戳同步于视频，因为音频时间戳被修改后不影响播放
-        audio->syncTo(*video);
-    }
 }
 
 bool MP4MuxerInterface::addTrack(const Track::Ptr &track) {
@@ -164,7 +144,7 @@ bool MP4MuxerInterface::addTrack(const Track::Ptr &track) {
     }
 
     if (!track->ready()) {
-        WarnL << "Track[" << track->getCodecName() << "] unready";
+        WarnL << "Track " << track->getCodecName() << " unready";
         return false;
     }
 
@@ -175,36 +155,26 @@ bool MP4MuxerInterface::addTrack(const Track::Ptr &track) {
     auto extra_size = extra ? extra->size() : 0;
     if (track->getTrackType() == TrackVideo) {
         auto video_track = dynamic_pointer_cast<VideoTrack>(track);
-        if (!video_track) {
-            WarnL << "不是VideoTrack";
-            return false;
-        }
-
+        CHECK(video_track);
         auto track_id = mp4_writer_add_video(_mov_writter.get(), mp4_object, video_track->getVideoWidth(), video_track->getVideoHeight(), extra_data, extra_size);
         if (track_id < 0) {
-            WarnL << "添加Video Track失败:" << video_track->getCodecName();
+            WarnL << "mp4_writer_add_video failed: " << video_track->getCodecName();
             return false;
         }
-        _codec_to_trackid[track->getCodecId()].track_id = track_id;
+        _tracks[track->getIndex()].track_id = track_id;
         _have_video = true;
     } else if (track->getTrackType() == TrackAudio) {
         auto audio_track = dynamic_pointer_cast<AudioTrack>(track);
-        if (!audio_track) {
-            WarnL << "不是音频Track:" << track->getCodecName();
-            return false;
-        }
-
-        auto track_id = mp4_writer_add_audio(_mov_writter.get(), mp4_object, audio_track->getAudioChannel(),
-                                             audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
-                                             audio_track->getAudioSampleRate(), extra_data, extra_size);
+        CHECK(audio_track);
+        auto track_id = mp4_writer_add_audio(_mov_writter.get(), mp4_object, audio_track->getAudioChannel(), audio_track->getAudioSampleBit() * audio_track->getAudioChannel(), audio_track->getAudioSampleRate(), extra_data, extra_size);
         if (track_id < 0) {
-            WarnL << "添加Track[" << track->getCodecName() << "]失败:" << track_id;
+            WarnL << "mp4_writer_add_audio failed: " << audio_track->getCodecName();
             return false;
         }
-        _codec_to_trackid[track->getCodecId()].track_id = track_id;
+        _tracks[track->getIndex()].track_id = track_id;
     }
 
-    //尝试音视频同步
+    // 尝试音视频同步
     stampSync();
     return true;
 }
@@ -236,7 +206,7 @@ void MP4MuxerMemory::resetTracks() {
 
 bool MP4MuxerMemory::inputFrame(const Frame::Ptr &frame) {
     if (_init_segment.empty()) {
-        //尚未生成init segment
+        // 尚未生成init segment
         return false;
     }
 
@@ -259,5 +229,5 @@ bool MP4MuxerMemory::inputFrame(const Frame::Ptr &frame) {
     return MP4MuxerInterface::inputFrame(frame);
 }
 
-}//namespace mediakit
-#endif //defined(ENABLE_MP4)
+} // namespace mediakit
+#endif // defined(ENABLE_MP4)
diff --git a/src/Record/MP4Muxer.h b/src/Record/MP4Muxer.h
index 1591699d..4f764c3f 100644
--- a/src/Record/MP4Muxer.h
+++ b/src/Record/MP4Muxer.h
@@ -72,12 +72,18 @@ private:
     bool _started = false;
     bool _have_video = false;
     MP4FileIO::Writer _mov_writter;
-    struct track_info {
+
+    class FrameMergerImp : public FrameMerger {
+    public:
+        FrameMergerImp() : FrameMerger(FrameMerger::mp4_nal_size) {}
+    };
+
+    struct MP4Track {
         int track_id = -1;
         Stamp stamp;
+        FrameMergerImp merger;
     };
-    std::unordered_map<int, track_info> _codec_to_trackid;
-    FrameMerger _frame_merger { FrameMerger::mp4_nal_size };
+    std::unordered_map<int, MP4Track> _tracks;
 };
 
 class MP4Muxer : public MP4MuxerInterface{
diff --git a/src/Record/MP4Reader.cpp b/src/Record/MP4Reader.cpp
index aa5fe1a6..e70f9fe8 100644
--- a/src/Record/MP4Reader.cpp
+++ b/src/Record/MP4Reader.cpp
@@ -27,7 +27,8 @@ MP4Reader::MP4Reader(const std::string &vhost, const std::string &app, const std
     option.enable_mp4 = false;
     option.enable_hls = false;
     option.enable_hls_fmp4 = false;
-
+    // mp4支持多track
+    option.max_track = 16;
     setup(vhost, app, stream_id, file_path, option, std::move(poller));
 }
 
diff --git a/src/Record/MPEG.cpp b/src/Record/MPEG.cpp
index 82ec8191..ef844277 100644
--- a/src/Record/MPEG.cpp
+++ b/src/Record/MPEG.cpp
@@ -18,7 +18,7 @@
 
 using namespace toolkit;
 
-namespace mediakit{
+namespace mediakit {
 
 MpegMuxer::MpegMuxer(bool is_ps) {
     _is_ps = is_ps;
@@ -40,27 +40,27 @@ bool MpegMuxer::addTrack(const Track::Ptr &track) {
     if (track->getTrackType() == TrackVideo) {
         _have_video = true;
     }
-    _codec_to_trackid[track->getCodecId()] = mpeg_muxer_add_stream((::mpeg_muxer_t *)_context, mpeg_id, nullptr, 0);
+    _tracks[track->getIndex()].track_id = mpeg_muxer_add_stream((::mpeg_muxer_t *)_context, mpeg_id, nullptr, 0);
     return true;
 }
 
 bool MpegMuxer::inputFrame(const Frame::Ptr &frame) {
-    auto it = _codec_to_trackid.find(frame->getCodecId());
-    if (it == _codec_to_trackid.end()) {
+    auto it = _tracks.find(frame->getIndex());
+    if (it == _tracks.end()) {
         return false;
     }
-    auto track_id = it->second;
+    auto &track = it->second;
     _key_pos = !_have_video;
     switch (frame->getCodecId()) {
         case CodecH264:
         case CodecH265: {
-            //这里的代码逻辑是让SPS、PPS、IDR这些时间戳相同的帧打包到一起当做一个帧处理，
-            return _frame_merger.inputFrame(frame,[this, track_id](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
+            // 这里的代码逻辑是让SPS、PPS、IDR这些时间戳相同的帧打包到一起当做一个帧处理，
+            return track.merger.inputFrame(frame, [&](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
                 _key_pos = have_idr;
-                //取视频时间戳为TS的时间戳
+                // 取视频时间戳为TS的时间戳
                 _timestamp = dts;
                 _max_cache_size = 512 + 1.2 * buffer->size();
-                mpeg_muxer_input((::mpeg_muxer_t *)_context, track_id, have_idr ? 0x0001 : 0, pts * 90LL,dts * 90LL, buffer->data(), buffer->size());
+                mpeg_muxer_input((::mpeg_muxer_t *)_context, track.track_id, have_idr ? 0x0001 : 0, pts * 90LL, dts * 90LL, buffer->data(), buffer->size());
                 flushCache();
             });
         }
@@ -80,7 +80,7 @@ bool MpegMuxer::inputFrame(const Frame::Ptr &frame) {
                 _timestamp = frame->dts();
             }
             _max_cache_size = 512 + 1.2 * frame->size();
-            mpeg_muxer_input((::mpeg_muxer_t *)_context, track_id, frame->keyFrame() ? 0x0001 : 0, frame->pts() * 90LL, frame->dts() * 90LL, frame->data(), frame->size());
+            mpeg_muxer_input((::mpeg_muxer_t *)_context, track.track_id, frame->keyFrame() ? 0x0001 : 0, frame->pts() * 90LL, frame->dts() * 90LL, frame->data(), frame->size());
             flushCache();
             return true;
         }
@@ -103,7 +103,6 @@ void MpegMuxer::createContext() {
                 if (!thiz->_current_buffer
                     || thiz->_current_buffer->size() + bytes > thiz->_current_buffer->getCapacity()) {
                     if (thiz->_current_buffer) {
-                        //WarnL << "need realloc mpeg buffer" << thiz->_current_buffer->size() + bytes  << " > " << thiz->_current_buffer->getCapacity();
                         thiz->flushCache();
                     }
                     thiz->_current_buffer = thiz->_buffer_pool.obtain2();
@@ -143,12 +142,13 @@ void MpegMuxer::releaseContext() {
         mpeg_muxer_destroy((::mpeg_muxer_t *)_context);
         _context = nullptr;
     }
-    _codec_to_trackid.clear();
-    _frame_merger.clear();
+    _tracks.clear();
 }
 
 void MpegMuxer::flush() {
-    _frame_merger.flush();
+    for (auto &pr : _tracks) {
+        pr.second.merger.flush();
+    }
 }
 
 }//mediakit
diff --git a/src/Record/MPEG.h b/src/Record/MPEG.h
index b1507fc9..dc07af4a 100644
--- a/src/Record/MPEG.h
+++ b/src/Record/MPEG.h
@@ -70,8 +70,17 @@ private:
     uint32_t _max_cache_size = 0;
     uint64_t _timestamp = 0;
     struct mpeg_muxer_t *_context = nullptr;
-    std::unordered_map<int, int/*track_id*/> _codec_to_trackid;
-    FrameMerger _frame_merger{FrameMerger::h264_prefix};
+
+    class FrameMergerImp : public FrameMerger {
+    public:
+        FrameMergerImp() : FrameMerger(FrameMerger::h264_prefix) {}
+    };
+
+    struct MP4Track {
+        int track_id = -1;
+        FrameMergerImp merger;
+    };
+    std::unordered_map<int, MP4Track> _tracks;
     toolkit::BufferRaw::Ptr _current_buffer;
     toolkit::ResourcePool<toolkit::BufferRaw> _buffer_pool;
 };
diff --git a/src/Rtmp/RtmpMuxer.cpp b/src/Rtmp/RtmpMuxer.cpp
index 52f83811..5a5e8b2d 100644
--- a/src/Rtmp/RtmpMuxer.cpp
+++ b/src/Rtmp/RtmpMuxer.cpp
@@ -23,17 +23,22 @@ RtmpMuxer::RtmpMuxer(const TitleMeta::Ptr &title) {
 }
 
 bool RtmpMuxer::addTrack(const Track::Ptr &track) {
-    auto &encoder = _encoder[track->getTrackType()];
-    if (encoder) {
-        WarnL << "Already add a track kind of: " << track->getTrackTypeStr()
-              << ", ignore track: " << track->getCodecName();
+    if (_track_existed[track->getTrackType()]) {
+        // rtmp不支持多个同类型track
+        WarnL << "Already add a track kind of: " << track->getTrackTypeStr() << ", ignore track: " << track->getCodecName();
         return false;
     }
+
+    auto &encoder = _encoders[track->getIndex()];
+    CHECK(!encoder);
     encoder = Factory::getRtmpEncoderByTrack(track);
     if (!encoder) {
         return false;
     }
 
+    // 标记已经存在该类型track
+    _track_existed[track->getTrackType()] = true;
+
     // 设置rtmp输出环形缓存
     encoder->setRtmpRing(_rtmp_ring);
 
@@ -43,22 +48,22 @@ bool RtmpMuxer::addTrack(const Track::Ptr &track) {
 }
 
 bool RtmpMuxer::inputFrame(const Frame::Ptr &frame) {
-    auto &encoder = _encoder[frame->getTrackType()];
+    auto &encoder = _encoders[frame->getIndex()];
     return encoder ? encoder->inputFrame(frame) : false;
 }
 
 void RtmpMuxer::flush() {
-    for (auto &encoder : _encoder) {
-        if (encoder) {
-            encoder->flush();
+    for (auto &pr : _encoders) {
+        if (pr.second) {
+            pr.second->flush();
         }
     }
 }
 
 void RtmpMuxer::makeConfigPacket() {
-    for (auto &encoder : _encoder) {
-        if (encoder) {
-            encoder->makeConfigPacket();
+    for (auto &pr : _encoders) {
+        if (pr.second) {
+            pr.second->makeConfigPacket();
         }
     }
 }
@@ -73,9 +78,8 @@ RtmpRing::RingType::Ptr RtmpMuxer::getRtmpRing() const {
 
 void RtmpMuxer::resetTracks() {
     _metadata.clear();
-    for (auto &encoder : _encoder) {
-        encoder = nullptr;
-    }
+    _encoders.clear();
+    CLEAR_ARR(_track_existed);
 }
 
 } /* namespace mediakit */
\ No newline at end of file
diff --git a/src/Rtmp/RtmpMuxer.h b/src/Rtmp/RtmpMuxer.h
index f64b875a..d029a632 100644
--- a/src/Rtmp/RtmpMuxer.h
+++ b/src/Rtmp/RtmpMuxer.h
@@ -64,10 +64,13 @@ public:
      * 生成config包
      */
      void makeConfigPacket();
+
 private:
-    RtmpRing::RingType::Ptr _rtmp_ring;
+    bool _track_existed[2] = { false, false };
+
     AMFValue _metadata;
-    RtmpCodec::Ptr _encoder[TrackMax];
+    RtmpRing::RingType::Ptr _rtmp_ring;
+    std::unordered_map<int, RtmpCodec::Ptr> _encoders;
 };
 
 
diff --git a/src/Rtp/Decoder.cpp b/src/Rtp/Decoder.cpp
index dc0ef749..65dc655c 100644
--- a/src/Rtp/Decoder.cpp
+++ b/src/Rtp/Decoder.cpp
@@ -62,7 +62,9 @@ DecoderImp::Ptr DecoderImp::createDecoder(Type type, MediaSinkInterface *sink){
 }
 
 void DecoderImp::flush() {
-    _merger.flush();
+    for (auto &pr : _tracks) {
+        pr.second.second.flush();
+    }
 }
 
 ssize_t DecoderImp::input(const uint8_t *data, size_t bytes){
@@ -88,9 +90,9 @@ void DecoderImp::onStream(int stream, int codecid, const void *extra, size_t byt
     if (!track) {
         return;
     }
-    onTrack(std::move(track));
+    onTrack(stream, std::move(track));
     // 防止未获取视频track提前complete导致忽略后续视频的问题，用于兼容一些不太规范的ps流
-    if (finish && _tracks[TrackVideo]) {
+    if (finish && _have_video) {
         _sink->addTrackCompleted();
         InfoL << "Add track finished";
     }
@@ -104,37 +106,43 @@ void DecoderImp::onDecode(int stream, int codecid, int flags, int64_t pts, int64
     if (codec == CodecInvalid) {
         return;
     }
-    if (!_tracks[getTrackType(codec)]) {
-        onTrack(Factory::getTrackByCodecId(codec, 8000, 1, 16));
+    auto &ref = _tracks[stream];
+    if (!ref.first) {
+        onTrack(stream, Factory::getTrackByCodecId(codec, 8000, 1, 16));
     }
-    // TODO 支持多track
-    auto frame = Factory::getFrameFromPtr(codec, (char *) data, bytes, dts, pts);
-    if (getTrackType(codec) == TrackVideo) {
-        _merger.inputFrame(frame, [&](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool) {
-            onFrame(Factory::getFrameFromBuffer(codec, buffer, dts, pts));
-        });
-    } else {
-        onFrame(frame);
+    auto frame = Factory::getFrameFromPtr(codec, (char *)data, bytes, dts, pts);
+    if (getTrackType(codec) != TrackVideo) {
+        onFrame(stream, frame);
+        return;
     }
+    ref.second.inputFrame(frame, [&](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool) {
+        onFrame(stream, Factory::getFrameFromBuffer(codec, buffer, dts, pts));
+    });
 }
 #else
 void DecoderImp::onDecode(int stream,int codecid,int flags,int64_t pts,int64_t dts,const void *data,size_t bytes) {}
 void DecoderImp::onStream(int stream,int codecid,const void *extra,size_t bytes,int finish) {}
 #endif
 
-void DecoderImp::onTrack(const Track::Ptr &track) {
+void DecoderImp::onTrack(int index, const Track::Ptr &track) {
     if (!track) {
         return;
     }
-    if (!_tracks[track->getTrackType()]) {
-        _tracks[track->getTrackType()] = track;
-        _sink->addTrack(track);
-        InfoL << "got track: " << track->getCodecName();
+    track->setIndex(index);
+    auto &ref = _tracks[index];
+    if (ref.first) {
+        WarnL << "Already existed a same track: " << index << ", codec: " << track->getCodecName();
+        return;
     }
+    ref.first = track;
+    _sink->addTrack(track);
+    InfoL << "Got track: " << track->getCodecName();
+    _have_video = track->getTrackType() == TrackVideo ? true : _have_video;
 }
 
-void DecoderImp::onFrame(const Frame::Ptr &frame) {
+void DecoderImp::onFrame(int index, const Frame::Ptr &frame) {
     if (frame) {
+        frame->setIndex(index);
         _sink->inputFrame(frame);
     }
 }
diff --git a/src/Rtp/Decoder.h b/src/Rtp/Decoder.h
index 55012870..9da460c4 100644
--- a/src/Rtp/Decoder.h
+++ b/src/Rtp/Decoder.h
@@ -48,8 +48,8 @@ public:
     void flush();
 
 protected:
-    void onTrack(const Track::Ptr &track);
-    void onFrame(const Frame::Ptr &frame);
+    void onTrack(int index, const Track::Ptr &track);
+    void onFrame(int index, const Frame::Ptr &frame);
 
 private:
     DecoderImp(const Decoder::Ptr &decoder, MediaSinkInterface *sink);
@@ -57,10 +57,15 @@ private:
     void onStream(int stream, int codecid, const void *extra, size_t bytes, int finish);
 
 private:
+    bool _have_video = false;
     Decoder::Ptr _decoder;
     MediaSinkInterface *_sink;
-    FrameMerger _merger{FrameMerger::none};
-    Track::Ptr _tracks[TrackMax];
+
+    class FrameMergerImp : public FrameMerger {
+    public:
+        FrameMergerImp() : FrameMerger(FrameMerger::none) {}
+    };
+    std::unordered_map<int, std::pair<Track::Ptr, FrameMergerImp> > _tracks;
 };
 
 }//namespace mediakit
diff --git a/src/Rtp/GB28181Process.cpp b/src/Rtp/GB28181Process.cpp
index 5f1cce82..82f97c0f 100644
--- a/src/Rtp/GB28181Process.cpp
+++ b/src/Rtp/GB28181Process.cpp
@@ -78,7 +78,7 @@ bool GB28181Process::inputRtp(bool, const char *data, size_t data_len) {
     if (!ref) {
         if (_rtp_receiver.size() > 2) {
             // 防止pt类型太多导致内存溢出
-            throw std::invalid_argument("rtp pt类型不得超过2种!");
+            WarnL << "Rtp payload type more than 2 types: " << _rtp_receiver.size();
         }
         switch (pt) {
             case Rtsp::PT_PCMA:
@@ -87,6 +87,7 @@ bool GB28181Process::inputRtp(bool, const char *data, size_t data_len) {
                 ref = std::make_shared<RtpReceiverImp>(8000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                 auto track = Factory::getTrackByCodecId(pt == Rtsp::PT_PCMU ? CodecG711U : CodecG711A, 8000, 1, 16);
                 CHECK(track);
+                track->setIndex(pt);
                 _interface->addTrack(track);
                 _rtp_decoder[pt] = Factory::getRtpDecoderByTrack(track);
                 break;
@@ -96,6 +97,7 @@ bool GB28181Process::inputRtp(bool, const char *data, size_t data_len) {
                 ref = std::make_shared<RtpReceiverImp>(90000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                 auto track = Factory::getTrackByCodecId(CodecJPEG);
                 CHECK(track);
+                track->setIndex(pt);
                 _interface->addTrack(track);
                 _rtp_decoder[pt] = Factory::getRtpDecoderByTrack(track);
                 break;
@@ -106,23 +108,28 @@ bool GB28181Process::inputRtp(bool, const char *data, size_t data_len) {
                     ref = std::make_shared<RtpReceiverImp>(48000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                     auto track = Factory::getTrackByCodecId(CodecOpus);
                     CHECK(track);
+                    track->setIndex(pt);
                     _interface->addTrack(track);
                     _rtp_decoder[pt] = Factory::getRtpDecoderByTrack(track);
                 } else if (pt == h265_pt) {
                     // H265负载
                     ref = std::make_shared<RtpReceiverImp>(90000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                     auto track = Factory::getTrackByCodecId(CodecH265);
+                    CHECK(track);
+                    track->setIndex(pt);
                     _interface->addTrack(track);
                     _rtp_decoder[pt] = Factory::getRtpDecoderByTrack(track);
                 } else if (pt == h264_pt) {
                     // H264负载
                     ref = std::make_shared<RtpReceiverImp>(90000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                     auto track = Factory::getTrackByCodecId(CodecH264);
+                    CHECK(track);
+                    track->setIndex(pt);
                     _interface->addTrack(track);
                     _rtp_decoder[pt] = Factory::getRtpDecoderByTrack(track);
                 } else {
                     if (pt != Rtsp::PT_MP2T && pt != ps_pt) {
-                        WarnL << "rtp payload type未识别(" << (int)pt << "),已按ts或ps负载处理";
+                        WarnL << "Unknown rtp payload type(" << (int)pt << "), decode it as mpeg-ps or mpeg-ts";
                     }
                     ref = std::make_shared<RtpReceiverImp>(90000, [this](RtpPacket::Ptr rtp) { onRtpSorted(std::move(rtp)); });
                     // ts或ps负载
@@ -142,7 +149,8 @@ bool GB28181Process::inputRtp(bool, const char *data, size_t data_len) {
             }
         }
         // 设置frame回调
-        _rtp_decoder[pt]->addDelegate([this](const Frame::Ptr &frame) {
+        _rtp_decoder[pt]->addDelegate([this, pt](const Frame::Ptr &frame) {
+            frame->setIndex(pt);
             onRtpDecode(frame);
             return true;
         });
diff --git a/src/Rtp/PSEncoder.cpp b/src/Rtp/PSEncoder.cpp
index 4e5c31d5..66e39bc7 100644
--- a/src/Rtp/PSEncoder.cpp
+++ b/src/Rtp/PSEncoder.cpp
@@ -22,7 +22,7 @@ namespace mediakit{
 PSEncoderImp::PSEncoderImp(uint32_t ssrc, uint8_t payload_type) : MpegMuxer(true) {
     GET_CONFIG(uint32_t,video_mtu,Rtp::kVideoMtuSize);
     _rtp_encoder = std::make_shared<CommonRtpEncoder>();
-    _rtp_encoder->setRtpInfo(ssrc, video_mtu, 90000, payload_type, 0);
+    _rtp_encoder->setRtpInfo(ssrc, video_mtu, 90000, payload_type);
     auto ring = std::make_shared<RtpRing::RingType>();
     ring->setDelegate(std::make_shared<RingDelegateHelper>([this](RtpPacket::Ptr rtp, bool is_key) { onRTP(std::move(rtp), is_key); }));
     _rtp_encoder->setRtpRing(std::move(ring));
diff --git a/src/Rtp/RawEncoder.cpp b/src/Rtp/RawEncoder.cpp
index b680eccb..4bc17af7 100644
--- a/src/Rtp/RawEncoder.cpp
+++ b/src/Rtp/RawEncoder.cpp
@@ -72,7 +72,7 @@ RtpCodec::Ptr RawEncoderImp::createRtpEncoder(const Track::Ptr &track) {
         sample_rate = std::static_pointer_cast<AudioTrack>(track)->getAudioSampleRate();
     }
     auto ret = Factory::getRtpEncoderByCodecId(track->getCodecId(), _payload_type);
-    ret->setRtpInfo(_ssrc, mtu, sample_rate, _payload_type, 2 * track->getTrackType());
+    ret->setRtpInfo(_ssrc, mtu, sample_rate, _payload_type);
     return ret;
 }
 
diff --git a/src/Rtp/RtpProcess.cpp b/src/Rtp/RtpProcess.cpp
index 8ac83f19..c0e16d64 100644
--- a/src/Rtp/RtpProcess.cpp
+++ b/src/Rtp/RtpProcess.cpp
@@ -254,8 +254,7 @@ void RtpProcess::emitOnPublish() {
                 return;
             }
             if (err.empty()) {
-                strong_self->_muxer = std::make_shared<MultiMediaSourceMuxer>(strong_self->_media_info, 0.0f,
-                                                                              option);
+                strong_self->_muxer = std::make_shared<MultiMediaSourceMuxer>(strong_self->_media_info, 0.0f, option);
                 if (strong_self->_only_audio) {
                     strong_self->_muxer->setOnlyAudio();
                 }
diff --git a/src/Rtsp/RtpCodec.cpp b/src/Rtsp/RtpCodec.cpp
index 83db75fe..65ee311f 100644
--- a/src/Rtsp/RtpCodec.cpp
+++ b/src/Rtsp/RtpCodec.cpp
@@ -19,6 +19,7 @@ RtpPacket::Ptr RtpInfo::makeRtp(TrackType type, const void* data, size_t len, bo
     rtp->setSize(payload_len + RtpPacket::kRtpTcpHeaderSize);
     rtp->sample_rate = _sample_rate;
     rtp->type = type;
+    rtp->track_index = _track_index;
 
     //rtsp over tcp 头
     auto ptr = (uint8_t *) rtp->data();
diff --git a/src/Rtsp/RtpCodec.h b/src/Rtsp/RtpCodec.h
index 0d1c7a80..d63f1962 100644
--- a/src/Rtsp/RtpCodec.h
+++ b/src/Rtsp/RtpCodec.h
@@ -54,7 +54,7 @@ class RtpInfo {
 public:
     using Ptr = std::shared_ptr<RtpInfo>;
 
-    RtpInfo(uint32_t ssrc, size_t mtu_size, uint32_t sample_rate, uint8_t pt, uint8_t interleaved) {
+    RtpInfo(uint32_t ssrc, size_t mtu_size, uint32_t sample_rate, uint8_t pt, uint8_t interleaved, int track_index) {
         if (ssrc == 0) {
             ssrc = ((uint64_t) this) & 0xFFFFFFFF;
         }
@@ -63,6 +63,7 @@ public:
         _mtu_size = mtu_size;
         _sample_rate = sample_rate;
         _interleaved = interleaved;
+        _track_index = track_index;
     }
 
     //返回rtp负载最大长度
@@ -78,6 +79,7 @@ private:
     uint16_t _seq = 0;
     uint32_t _ssrc;
     uint32_t _sample_rate;
+    int _track_index;
     size_t _mtu_size;
 };
 
@@ -85,8 +87,8 @@ class RtpCodec : public RtpRing, public FrameDispatcher {
 public:
     using Ptr = std::shared_ptr<RtpCodec>;
 
-    void setRtpInfo(uint32_t ssrc, size_t mtu_size, uint32_t sample_rate, uint8_t pt, uint8_t interleaved) {
-        _rtp_info.reset(new RtpInfo(ssrc, mtu_size, sample_rate, pt, interleaved));
+    void setRtpInfo(uint32_t ssrc, size_t mtu_size, uint32_t sample_rate, uint8_t pt, uint8_t interleaved = 0, int track_index = 0) {
+        _rtp_info.reset(new RtpInfo(ssrc, mtu_size, sample_rate, pt, interleaved, track_index));
     }
 
     RtpInfo &getRtpInfo() { return *_rtp_info; }
diff --git a/src/Rtsp/Rtsp.h b/src/Rtsp/Rtsp.h
index 8963c8ce..fde5caea 100644
--- a/src/Rtsp/Rtsp.h
+++ b/src/Rtsp/Rtsp.h
@@ -166,7 +166,7 @@ public:
     // ntp时间戳
     uint64_t ntp_stamp;
 
-    bool disable_ntp = false;
+    int track_index;
 
     static Ptr create();
 
diff --git a/src/Rtsp/RtspMuxer.cpp b/src/Rtsp/RtspMuxer.cpp
index f2967c04..dae5f111 100644
--- a/src/Rtsp/RtspMuxer.cpp
+++ b/src/Rtsp/RtspMuxer.cpp
@@ -19,18 +19,19 @@ namespace mediakit {
 
 void RtspMuxer::onRtp(RtpPacket::Ptr in, bool is_key) {
     if (_live) {
-        if (_rtp_stamp[in->type] != in->getHeader()->stamp) {
+        auto &ref = _tracks[in->track_index];
+        if (ref.rtp_stamp != in->getHeader()->stamp) {
             // rtp时间戳变化才计算ntp，节省cpu资源
             int64_t stamp_ms = in->getStamp() * uint64_t(1000) / in->sample_rate;
             int64_t stamp_ms_inc;
             // 求rtp时间戳增量
-            _stamp[in->type].revise(stamp_ms, stamp_ms, stamp_ms_inc, stamp_ms_inc);
-            _rtp_stamp[in->type] = in->getHeader()->stamp;
-            _ntp_stamp[in->type] = stamp_ms_inc + _ntp_stamp_start;
+            ref.stamp.revise(stamp_ms, stamp_ms, stamp_ms_inc, stamp_ms_inc);
+            ref.rtp_stamp = in->getHeader()->stamp;
+            ref.ntp_stamp = stamp_ms_inc + _ntp_stamp_start;
         }
 
         // rtp拦截入口，此处统一赋值ntp
-        in->ntp_stamp = _ntp_stamp[in->type];
+        in->ntp_stamp = ref.ntp_stamp;
     } else {
         // 点播情况下设置ntp时间戳为rtp时间戳加基准ntp时间戳
         in->ntp_stamp = _ntp_stamp_start + (in->getStamp() * uint64_t(1000) / in->sample_rate);
@@ -55,16 +56,20 @@ RtspMuxer::RtspMuxer(const TitleSdp::Ptr &title) {
 }
 
 bool RtspMuxer::addTrack(const Track::Ptr &track) {
-    auto &encoder = _encoder[track->getTrackType()];
-    if (encoder) {
-        WarnL << "Already add a track kind of: " << track->getTrackTypeStr()
-              << ", ignore track: " << track->getCodecName();
+    if (_track_existed[track->getTrackType()]) {
+        // rtsp不支持多个同类型track
+        WarnL << "Already add a track kind of: " << track->getTrackTypeStr() << ", ignore track: " << track->getCodecName();
         return false;
     }
+
+    auto &ref = _tracks[track->getIndex()];
+    auto &encoder = ref.encoder;
+    CHECK(!encoder);
+
     // payload type 96以后则为动态pt
     Sdp::Ptr sdp = track->getSdp(96 + _index);
     if (!sdp) {
-        WarnL << "rtsp复用器不支持该编码:" << track->getCodecName();
+        WarnL << "Unsupported codec: " << track->getCodecName();
         return false;
     }
 
@@ -73,6 +78,9 @@ bool RtspMuxer::addTrack(const Track::Ptr &track) {
         return false;
     }
 
+    // 标记已经存在该类型track
+    _track_existed[track->getTrackType()] = true;
+
     {
         static atomic<uint32_t> s_ssrc(0);
         uint32_t ssrc = s_ssrc++;
@@ -90,7 +98,7 @@ bool RtspMuxer::addTrack(const Track::Ptr &track) {
         GET_CONFIG(uint32_t, audio_mtu, Rtp::kAudioMtuSize);
         GET_CONFIG(uint32_t, video_mtu, Rtp::kVideoMtuSize);
         auto mtu = track->getTrackType() == TrackVideo ? video_mtu : audio_mtu;
-        encoder->setRtpInfo(ssrc, mtu, sdp->getSampleRate(), sdp->getPayloadType(), 2 * track->getTrackType());
+        encoder->setRtpInfo(ssrc, mtu, sdp->getSampleRate(), sdp->getPayloadType(), 2 * track->getTrackType(), track->getIndex());
     }
 
     // 设置rtp输出环形缓存
@@ -106,28 +114,33 @@ bool RtspMuxer::addTrack(const Track::Ptr &track) {
     trySyncTrack();
 
     // rtp的时间戳是pts，允许回退
-    _stamp[TrackVideo].enableRollback(true);
-
+    if (track->getTrackType() == TrackVideo) {
+        ref.stamp.enableRollback(true);
+    }
     ++_index;
     return true;
 }
 
 void RtspMuxer::trySyncTrack() {
-    if (_encoder[TrackAudio] && _encoder[TrackVideo]) {
-        // 音频时间戳同步于视频，因为音频时间戳被修改后不影响播放
-        _stamp[TrackAudio].syncTo(_stamp[TrackVideo]);
+    Stamp *first = nullptr;
+    for (auto &pr : _tracks) {
+        if (!first) {
+            first = &pr.second.stamp;
+        } else {
+            pr.second.stamp.syncTo(*first);
+        }
     }
 }
 
 bool RtspMuxer::inputFrame(const Frame::Ptr &frame) {
-    auto &encoder = _encoder[frame->getTrackType()];
+    auto &encoder = _tracks[frame->getIndex()].encoder;
     return encoder ? encoder->inputFrame(frame) : false;
 }
 
 void RtspMuxer::flush() {
-    for (auto &encoder : _encoder) {
-        if (encoder) {
-            encoder->flush();
+    for (auto &pr : _tracks) {
+        if (pr.second.encoder) {
+            pr.second.encoder->flush();
         }
     }
 }
@@ -142,9 +155,8 @@ RtpRing::RingType::Ptr RtspMuxer::getRtpRing() const {
 
 void RtspMuxer::resetTracks() {
     _sdp.clear();
-    for (auto &encoder : _encoder) {
-        encoder = nullptr;
-    }
+    _tracks.clear();
+    CLEAR_ARR(_track_existed);
 }
 
 } /* namespace mediakit */
\ No newline at end of file
diff --git a/src/Rtsp/RtspMuxer.h b/src/Rtsp/RtspMuxer.h
index ba528ecf..00f356e0 100644
--- a/src/Rtsp/RtspMuxer.h
+++ b/src/Rtsp/RtspMuxer.h
@@ -85,13 +85,20 @@ private:
 
 private:
     bool _live = true;
+    bool _track_existed[2] = { false, false };
+
     uint8_t _index {0};
-    uint32_t _rtp_stamp[TrackMax]{0};
-    uint64_t _ntp_stamp[TrackMax]{0};
     uint64_t _ntp_stamp_start;
     std::string _sdp;
-    Stamp _stamp[TrackMax];
-    RtpCodec::Ptr _encoder[TrackMax];
+
+    struct TrackInfo {
+        Stamp stamp;
+        uint32_t rtp_stamp { 0 };
+        uint64_t ntp_stamp { 0 };
+        RtpCodec::Ptr encoder;
+    };
+
+    std::unordered_map<int, TrackInfo> _tracks;
     RtpRing::RingType::Ptr _rtpRing;
     RtpRing::RingType::Ptr _rtpInterceptor;
 };
diff --git a/srt/SrtTransportImp.cpp b/srt/SrtTransportImp.cpp
index ab67f52b..087bb4ae 100644
--- a/srt/SrtTransportImp.cpp
+++ b/srt/SrtTransportImp.cpp
@@ -287,18 +287,7 @@ std::string SrtTransportImp::getIdentifier() const {
 
 bool SrtTransportImp::inputFrame(const Frame::Ptr &frame) {
     if (_muxer) {
-        //TraceL<<"before type "<<frame->getCodecName()<<" dts "<<frame->dts()<<" pts "<<frame->pts();
-        auto frame_tmp = std::make_shared<FrameStamp>(frame, _type_to_stamp[frame->getTrackType()],false);
-        if(_type_to_stamp.size()>1){
-            // 有音视频，检查是否时间戳是否差距过大
-            auto diff = _type_to_stamp[TrackType::TrackVideo].getRelativeStamp() - _type_to_stamp[TrackType::TrackAudio].getRelativeStamp();
-            if(std::abs(diff) > 5000){
-                // 超过5s，应该同步 TODO
-                WarnL << _media_info.full_url <<" video or audio not sync : "<<diff;
-            }
-        }
-        //TraceL<<"after type "<<frame_tmp->getCodecName()<<" dts "<<frame_tmp->dts()<<" pts "<<frame_tmp->pts();
-        return _muxer->inputFrame(frame_tmp);
+        return _muxer->inputFrame(frame);
     }
     if (_cached_func.size() > 200) {
         WarnL << "cached frame of track(" << frame->getCodecName() << ") is too much, now dropped";
@@ -306,17 +295,11 @@ bool SrtTransportImp::inputFrame(const Frame::Ptr &frame) {
     }
     auto frame_cached = Frame::getCacheAbleFrame(frame);
     lock_guard<recursive_mutex> lck(_func_mtx);
-    _cached_func.emplace_back([this, frame_cached]() { 
-        //TraceL<<"before type "<<frame_cached->getCodecName()<<" dts "<<frame_cached->dts()<<" pts "<<frame_cached->pts();
-        auto frame_tmp = std::make_shared<FrameStamp>(frame_cached, _type_to_stamp[frame_cached->getTrackType()],false);
-        //TraceL<<"after type "<<frame_tmp->getCodecName()<<" dts "<<frame_tmp->dts()<<" pts "<<frame_tmp->pts();
-        _muxer->inputFrame(frame_tmp);
-    });
+    _cached_func.emplace_back([this, frame_cached]() { _muxer->inputFrame(frame_cached); });
     return true;
 }
 
 bool SrtTransportImp::addTrack(const Track::Ptr &track) {
-    _type_to_stamp.emplace(track->getTrackType(),Stamp());
     if (_muxer) {
         return _muxer->addTrack(track);
     }
@@ -333,9 +316,6 @@ void SrtTransportImp::addTrackCompleted() {
         lock_guard<recursive_mutex> lck(_func_mtx);
         _cached_func.emplace_back([this]() { _muxer->addTrackCompleted(); });
     }
-    if(_type_to_stamp.size() >1){
-        _type_to_stamp[TrackType::TrackAudio].syncTo(_type_to_stamp[TrackType::TrackVideo]);
-    }
 }
 
 void SrtTransportImp::doCachedFunc() {
diff --git a/srt/SrtTransportImp.hpp b/srt/SrtTransportImp.hpp
index 71478605..9c1ac47e 100644
--- a/srt/SrtTransportImp.hpp
+++ b/srt/SrtTransportImp.hpp
@@ -86,8 +86,6 @@ private:
     DecoderImp::Ptr _decoder;
     std::recursive_mutex _func_mtx;
     std::deque<std::function<void()>> _cached_func;
-
-    std::unordered_map<int, Stamp> _type_to_stamp;
 };
 
 } // namespace SRT