diff --git a/src/Extension/CommonRtp.cpp b/src/Extension/CommonRtp.cpp
index ff7def3c..9ba9b682 100644
--- a/src/Extension/CommonRtp.cpp
+++ b/src/Extension/CommonRtp.cpp
@@ -76,7 +76,7 @@ bool CommonRtpEncoder::inputFrame(const Frame::Ptr &frame){
     auto len = frame->size() - frame->prefixSize();
     auto remain_size = len;
     auto max_size = getMaxSize();
-
+    bool is_key = frame->keyFrame();
     bool mark = false;
     while (remain_size > 0) {
         size_t rtp_size;
@@ -86,9 +86,10 @@ bool CommonRtpEncoder::inputFrame(const Frame::Ptr &frame){
             rtp_size = remain_size;
             mark = true;
         }
-        RtpCodec::inputRtp(makeRtp(getTrackType(), ptr, rtp_size, mark, stamp), false);
+        RtpCodec::inputRtp(makeRtp(getTrackType(), ptr, rtp_size, mark, stamp), is_key);
         ptr += rtp_size;
         remain_size -= rtp_size;
+        is_key = false;
     }
     return len > 0;
 }
\ No newline at end of file
diff --git a/src/Extension/Frame.h b/src/Extension/Frame.h
index 497eb0c5..6f353088 100644
--- a/src/Extension/Frame.h
+++ b/src/Extension/Frame.h
@@ -391,17 +391,18 @@ class FrameFromPtr : public Frame{
 public:
     typedef std::shared_ptr<FrameFromPtr> Ptr;
 
-    FrameFromPtr(CodecId codec_id, char *ptr, size_t size, uint32_t dts, uint32_t pts = 0, size_t prefix_size = 0)
-            : FrameFromPtr(ptr, size, dts, pts, prefix_size) {
+    FrameFromPtr(CodecId codec_id, char *ptr, size_t size, uint32_t dts, uint32_t pts = 0, size_t prefix_size = 0,bool is_key = false )
+            : FrameFromPtr(ptr, size, dts, pts, prefix_size,is_key) {
         _codec_id = codec_id;
     }
 
-    FrameFromPtr(char *ptr, size_t size, uint32_t dts, uint32_t pts = 0, size_t prefix_size = 0){
+    FrameFromPtr(char *ptr, size_t size, uint32_t dts, uint32_t pts = 0, size_t prefix_size = 0,bool is_key = false){
         _ptr = ptr;
         _size = size;
         _dts = dts;
         _pts = pts;
         _prefix_size = prefix_size;
+        _is_key = is_key;
     }
 
     char *data() const override{
@@ -440,7 +441,7 @@ public:
     }
 
     bool keyFrame() const override {
-        return false;
+        return _is_key;
     }
 
     bool configFrame() const override{
@@ -457,6 +458,7 @@ protected:
     size_t _size;
     size_t _prefix_size;
     CodecId _codec_id = CodecInvalid;
+    bool _is_key;
 };
 
 /**
diff --git a/src/Rtp/PSEncoder.cpp b/src/Rtp/PSEncoder.cpp
index 71ab3171..aaff629f 100644
--- a/src/Rtp/PSEncoder.cpp
+++ b/src/Rtp/PSEncoder.cpp
@@ -23,7 +23,7 @@ PSEncoderImp::PSEncoderImp(uint32_t ssrc, uint8_t payload_type) : MpegMuxer(true
     _rtp_encoder = std::make_shared<CommonRtpEncoder>(CodecInvalid, ssrc, video_mtu, 90000, payload_type, 0);
     _rtp_encoder->setRtpRing(std::make_shared<RtpRing::RingType>());
     _rtp_encoder->getRtpRing()->setDelegate(std::make_shared<RingDelegateHelper>([this](RtpPacket::Ptr rtp, bool is_key){
-        onRTP(std::move(rtp));
+        onRTP(std::move(rtp),is_key);
     }));
     InfoL << this << " " << printSSRC(_rtp_encoder->getSsrc());
 }
@@ -36,7 +36,7 @@ void PSEncoderImp::onWrite(std::shared_ptr<Buffer> buffer, uint32_t stamp, bool
     if (!buffer) {
         return;
     }
-    _rtp_encoder->inputFrame(std::make_shared<FrameFromPtr>(buffer->data(), buffer->size(), stamp, stamp));
+    _rtp_encoder->inputFrame(std::make_shared<FrameFromPtr>(buffer->data(), buffer->size(), stamp, stamp,0,key_pos));
 }
 
 }//namespace mediakit
diff --git a/src/Rtp/PSEncoder.h b/src/Rtp/PSEncoder.h
index 76e7418f..adbf76f7 100644
--- a/src/Rtp/PSEncoder.h
+++ b/src/Rtp/PSEncoder.h
@@ -27,7 +27,7 @@ public:
 
 protected:
     //rtp打包后回调
-    virtual void onRTP(toolkit::Buffer::Ptr rtp) = 0;
+    virtual void onRTP(toolkit::Buffer::Ptr rtp,bool is_key = false) = 0;
 
 protected:
     void onWrite(std::shared_ptr<toolkit::Buffer> buffer, uint32_t stamp, bool key_pos) override;
diff --git a/src/Rtp/RawEncoder.cpp b/src/Rtp/RawEncoder.cpp
index 714350b6..f97b5b38 100644
--- a/src/Rtp/RawEncoder.cpp
+++ b/src/Rtp/RawEncoder.cpp
@@ -35,7 +35,7 @@ bool RawEncoderImp::addTrack(const Track::Ptr &track){
         _rtp_encoder = createRtpEncoder(track);
         _rtp_encoder->setRtpRing(std::make_shared<RtpRing::RingType>());
         _rtp_encoder->getRtpRing()->setDelegate(std::make_shared<RingDelegateHelper>([this](RtpPacket::Ptr rtp, bool is_key){
-            onRTP(std::move(rtp));
+            onRTP(std::move(rtp),true);
          }));
         return true;
     }
@@ -44,7 +44,7 @@ bool RawEncoderImp::addTrack(const Track::Ptr &track){
          _rtp_encoder = createRtpEncoder(track);
          _rtp_encoder->setRtpRing(std::make_shared<RtpRing::RingType>());
         _rtp_encoder->getRtpRing()->setDelegate(std::make_shared<RingDelegateHelper>([this](RtpPacket::Ptr rtp, bool is_key){
-            onRTP(std::move(rtp));
+            onRTP(std::move(rtp),is_key);
          }));
         return true;
     }
diff --git a/src/Rtp/RawEncoder.h b/src/Rtp/RawEncoder.h
index 342e9e02..6a18f450 100644
--- a/src/Rtp/RawEncoder.h
+++ b/src/Rtp/RawEncoder.h
@@ -43,10 +43,9 @@ public:
 
 protected:
     //rtp打包后回调
-    virtual void onRTP(toolkit::Buffer::Ptr rtp) = 0;
+    virtual void onRTP(toolkit::Buffer::Ptr rtp, bool is_key = false) = 0;
 private:
     RtpCodec::Ptr createRtpEncoder(const Track::Ptr &track);
-
     uint32_t _ssrc;
     uint8_t _payload_type;
     bool _sendAudio;
diff --git a/src/Rtp/RtpCache.cpp b/src/Rtp/RtpCache.cpp
index 08ecba22..89b05d4a 100644
--- a/src/Rtp/RtpCache.cpp
+++ b/src/Rtp/RtpCache.cpp
@@ -19,25 +19,37 @@ namespace mediakit{
 RtpCache::RtpCache(onFlushed cb) {
     _cb = std::move(cb);
 }
-
+bool RtpCache::firstKeyReady(bool in) {
+    if(_first_key){
+        return _first_key;
+    }
+    _first_key = in;
+    return _first_key;
+}
 void RtpCache::onFlush(std::shared_ptr<List<Buffer::Ptr> > rtp_list, bool) {
     _cb(std::move(rtp_list));
 }
 
-void RtpCache::input(uint64_t stamp, Buffer::Ptr buffer) {
-    inputPacket(stamp, true, std::move(buffer), false);
+void RtpCache::input(uint64_t stamp, Buffer::Ptr buffer,bool is_key ) {
+    inputPacket(stamp, true, std::move(buffer), is_key);
 }
 
-void RtpCachePS::onRTP(Buffer::Ptr buffer) {
+void RtpCachePS::onRTP(Buffer::Ptr buffer,bool is_key) {
+    if(!firstKeyReady(is_key)){
+        return;
+    }
     auto rtp = std::static_pointer_cast<RtpPacket>(buffer);
     auto stamp = rtp->getStampMS();
-    input(stamp, std::move(buffer));
+    input(stamp, std::move(buffer),is_key);
 }
 
-void RtpCacheRaw::onRTP(Buffer::Ptr buffer) {
+void RtpCacheRaw::onRTP(Buffer::Ptr buffer,bool is_key) {
+    if(!firstKeyReady(is_key)){
+        return;
+    }
     auto rtp = std::static_pointer_cast<RtpPacket>(buffer);
     auto stamp = rtp->getStampMS();
-    input(stamp, std::move(buffer));
+    input(stamp, std::move(buffer),is_key);
 }
 
 }//namespace mediakit
diff --git a/src/Rtp/RtpCache.h b/src/Rtp/RtpCache.h
index b393bca4..4144b345 100644
--- a/src/Rtp/RtpCache.h
+++ b/src/Rtp/RtpCache.h
@@ -30,13 +30,15 @@ protected:
      * 输入rtp(目的是为了合并写)
      * @param buffer rtp数据
      */
-    void input(uint64_t stamp, toolkit::Buffer::Ptr buffer);
+    void input(uint64_t stamp, toolkit::Buffer::Ptr buffer,bool is_key = false);
 
+    bool firstKeyReady(bool in);
 protected:
     void onFlush(std::shared_ptr<toolkit::List<toolkit::Buffer::Ptr> > rtp_list, bool) override;
 
 private:
     onFlushed _cb;
+    bool _first_key = false;
 };
 
 class RtpCachePS : public RtpCache, public PSEncoderImp{
@@ -45,7 +47,7 @@ public:
     ~RtpCachePS() override = default;
 
 protected:
-    void onRTP(toolkit::Buffer::Ptr rtp)  override;
+    void onRTP(toolkit::Buffer::Ptr rtp,bool is_key = false)  override;
 };
 
 
@@ -55,7 +57,7 @@ public:
     ~RtpCacheRaw() override = default;
 
 protected:
-    void onRTP(toolkit::Buffer::Ptr rtp)  override;
+    void onRTP(toolkit::Buffer::Ptr rtp,bool is_key = false)  override;
 };
 
 }//namespace mediakit