diff --git a/mediaPlayer/MediaPlayer.cpp b/mediaPlayer/MediaPlayer.cpp
index cb83eb4d1..863726505 100644
--- a/mediaPlayer/MediaPlayer.cpp
+++ b/mediaPlayer/MediaPlayer.cpp
@@ -96,6 +96,7 @@ namespace Cicada {
         listener.Completion = completionCallback;
         listener.FirstFrameShow = firstFrameCallback;
         listener.VideoSizeChanged = videoSizeChangedCallback;
+        listener.VideoRendered = videoRenderedCallback;
         listener.PositionUpdate = currentPostionCallback;
         listener.BufferPositionUpdate = bufferPostionCallback;
         listener.LoadingStart = loadingStartCallback;
@@ -436,8 +437,8 @@ namespace Cicada {
             playerConfig.highBufferDuration = playerConfig.maxDelayTime;
         }
 
-        if (playerConfig.startBufferDuration > playerConfig.highBufferDuration) {
-            playerConfig.startBufferDuration = playerConfig.highBufferDuration;
+        if (playerConfig.startBufferDuration > playerConfig.maxBufferDuration) {
+            playerConfig.startBufferDuration = playerConfig.maxBufferDuration;
         }
 
         //must
@@ -761,6 +762,13 @@ namespace Cicada {
         }
     }
 
+    void  MediaPlayer::videoRenderedCallback(int64_t timeMs, int64_t pts, void *userData)
+    {
+        GET_MEDIA_PLAYER
+        player->mListener.VideoRendered(timeMs, pts, player->mListener.userData);
+    }
+
+
     void MediaPlayer::currentPostionCallback(int64_t position, void *userData)
     {
         GET_MEDIA_PLAYER
@@ -1035,16 +1043,18 @@ namespace Cicada {
         mPlayUrlChangedCallback = urlChangedCallbak;
     }
 
-    void MediaPlayer::onMediaFrameCallback(void *arg, const unique_ptr<IAFPacket>& frame, StreamType type)
+    void MediaPlayer::onMediaFrameCallback(void *arg, const unique_ptr<IAFPacket> &frame, StreamType type)
     {
         MediaPlayer *player = (MediaPlayer *)arg;
+
         if (nullptr == player) {
             return;
         }
+
         player->mediaFrameCallback(frame, type);
     }
 
-    void MediaPlayer::mediaFrameCallback(const unique_ptr<IAFPacket>& frame, StreamType type)
+    void MediaPlayer::mediaFrameCallback(const unique_ptr<IAFPacket> &frame, StreamType type)
     {
         if (mCacheManager) {
             mCacheManager->sendMediaFrame(frame, type);
@@ -1054,4 +1064,11 @@ namespace Cicada {
             mMediaFrameFunc(mMediaFrameArg, frame, type);
         }
     }
+
+
+    void MediaPlayer::EnableVideoRenderedCallback(bool enable)
+    {
+        GET_PLAYER_HANDLE;
+        CicadaSetOption(handle, "enableVRC", enable ? "1" : "0");
+    }
 }
diff --git a/mediaPlayer/MediaPlayer.h b/mediaPlayer/MediaPlayer.h
index dc51fff78..6ff111f97 100644
--- a/mediaPlayer/MediaPlayer.h
+++ b/mediaPlayer/MediaPlayer.h
@@ -58,6 +58,9 @@ namespace Cicada {
         }
 
     public:
+
+        void EnableVideoRenderedCallback(bool enable);
+
         /*
          * set player listener
          */
@@ -323,6 +326,8 @@ namespace Cicada {
 
         static void videoSizeChangedCallback(int64_t width, int64_t height, void *userData);
 
+        static void videoRenderedCallback(int64_t timeMs, int64_t pts, void *userData);
+
         static void currentPostionCallback(int64_t position, void *userData);
 
         static void bufferPostionCallback(int64_t position, void *userData);
diff --git a/mediaPlayer/SuperMediaPlayer.cpp b/mediaPlayer/SuperMediaPlayer.cpp
index 34d30249c..4b7cd86b8 100644
--- a/mediaPlayer/SuperMediaPlayer.cpp
+++ b/mediaPlayer/SuperMediaPlayer.cpp
@@ -550,6 +550,8 @@ namespace Cicada {
         } else if (theKey == "description") {
             mSet.mOptions.set(theKey, value, options::REPLACE);
             return 0;
+        }  else if (theKey == "enableVRC") {
+            mSet.bEnableVRC = (atoi(value) != 0);
         }
 
         return 0;
@@ -578,6 +580,9 @@ namespace Cicada {
             snprintf(value, MAX_OPT_VALUE_LENGTH, "%" PRId64 "", size);
         } else if (theKey == "description") {
             snprintf(value, MAX_OPT_VALUE_LENGTH, "%s", mSet.mOptions.get("description").c_str());
+        } else if ( theKey == "renderFps") {
+            float renderFps = GetVideoRenderFps();
+            snprintf(value, MAX_OPT_VALUE_LENGTH, "%f", renderFps);
         }
 
         return;
@@ -2586,7 +2591,7 @@ namespace Cicada {
         //flush frame queue
 
         while (!mVideoFrameQue.empty()) {
-            ProcessVideoRenderedMsg(mVideoFrameQue.front()->getInfo().pts, nullptr);
+            ProcessVideoRenderedMsg(mVideoFrameQue.front()->getInfo().pts, af_getsteady_ms(), nullptr);
             mVideoFrameQue.pop();
         }
 
@@ -3674,6 +3679,7 @@ namespace Cicada {
         pHandle->mUtil.render(pts);
         MsgParam param;
         param.videoRenderedParam.pts = pts;
+        param.videoRenderedParam.timeMs = af_getsteady_ms();
         param.videoRenderedParam.userData = userData;
         pHandle->putMsg(MSG_INTERNAL_VIDEO_RENDERED, param, false);
     }
@@ -3688,7 +3694,7 @@ namespace Cicada {
         }
     }
 
-    void SuperMediaPlayer::ProcessVideoRenderedMsg(int64_t pts, void *picUserData)
+    void SuperMediaPlayer::ProcessVideoRenderedMsg(int64_t pts, int64_t timeMs, void *picUserData)
     {
         checkFirstRender();
 
@@ -3707,6 +3713,11 @@ namespace Cicada {
         }
 
         mDemuxerService->SetOption("FRAME_RENDERED", pts);
+
+        if (mSet.bEnableVRC) {
+            mPNotifier->NotifyVideoRendered(timeMs, pts);
+        }
+
         //TODO packetGotTime
     }
 
@@ -3960,7 +3971,7 @@ namespace Cicada {
     {
         while (!mVideoFrameQue.empty()) {
             int64_t pts = mVideoFrameQue.front()->getInfo().pts;
-            ProcessVideoRenderedMsg(pts, nullptr);
+            ProcessVideoRenderedMsg(pts, af_getsteady_ms(),  nullptr);
             mVideoFrameQue.pop();
         }
 
diff --git a/mediaPlayer/SuperMediaPlayer.h b/mediaPlayer/SuperMediaPlayer.h
index 18be8aff7..780ef2b2b 100644
--- a/mediaPlayer/SuperMediaPlayer.h
+++ b/mediaPlayer/SuperMediaPlayer.h
@@ -346,7 +346,7 @@ namespace Cicada {
 
         void ProcessSwitchStreamMsg(int index) final;
 
-        void ProcessVideoRenderedMsg(int64_t pts, void *picUserData) final;
+        void ProcessVideoRenderedMsg(int64_t pts, int64_t timeMs , void *picUserData) final;
 
         void ProcessVideoCleanFrameMsg() final;
 
diff --git a/mediaPlayer/native_cicada_player_def.h b/mediaPlayer/native_cicada_player_def.h
index 0ac2c1dfd..83a7b6fbd 100644
--- a/mediaPlayer/native_cicada_player_def.h
+++ b/mediaPlayer/native_cicada_player_def.h
@@ -90,6 +90,7 @@ typedef struct playerListener_t {
 
     playerType12Callback VideoSizeChanged;
     playerType12Callback StatusChanged;
+    playerType12Callback VideoRendered;
 
     playerType13Callback ErrorCallback;
 
diff --git a/mediaPlayer/player_msg_control.cpp b/mediaPlayer/player_msg_control.cpp
index 3181a9455..5eeca91d7 100644
--- a/mediaPlayer/player_msg_control.cpp
+++ b/mediaPlayer/player_msg_control.cpp
@@ -256,6 +256,7 @@ namespace Cicada {
 
             case MSG_INTERNAL_VIDEO_RENDERED:
                 mProcessor.ProcessVideoRenderedMsg(msgContent.videoRenderedParam.pts,
+                                                   msgContent.videoRenderedParam.timeMs,
                                                    msgContent.videoRenderedParam.userData);
                 break;
 
diff --git a/mediaPlayer/player_msg_control.h b/mediaPlayer/player_msg_control.h
index 3b1c5ab9a..f497f5b15 100644
--- a/mediaPlayer/player_msg_control.h
+++ b/mediaPlayer/player_msg_control.h
@@ -73,6 +73,7 @@ namespace Cicada {
 
     typedef struct _MsgVideoRenderedParam {
         int64_t pts;
+        int64_t timeMs;
         void *userData;
     } MsgVideoRenderedParam;
 
@@ -131,7 +132,7 @@ namespace Cicada {
 
         virtual void ProcessSwitchStreamMsg(int index) = 0;
 
-        virtual void ProcessVideoRenderedMsg(int64_t pts, void *picUserData) = 0;
+        virtual void ProcessVideoRenderedMsg(int64_t pts, int64_t timeMs , void *picUserData) = 0;
 
         virtual void ProcessVideoCleanFrameMsg() = 0;
 
diff --git a/mediaPlayer/player_notifier.cpp b/mediaPlayer/player_notifier.cpp
index ccb2b8e06..e32ce4836 100644
--- a/mediaPlayer/player_notifier.cpp
+++ b/mediaPlayer/player_notifier.cpp
@@ -210,6 +210,16 @@ namespace Cicada {
         pushEvent(event);
     }
 
+    void PlayerNotifier::NotifyVideoRendered(int64_t timeMs, int64_t pts)
+    {
+        if (!mEnable || mListener.VideoRendered == nullptr) {
+            return;
+        }
+
+        auto *event = new player_event(timeMs, pts, mListener.VideoRendered);
+        pushEvent(event);
+    }
+
     void PlayerNotifier::NotifyFirstFrame()
     {
         if (!mEnable || mListener.FirstFrameShow == nullptr) {
diff --git a/mediaPlayer/player_notifier.h b/mediaPlayer/player_notifier.h
index 7036a8c99..fbf00d0ec 100644
--- a/mediaPlayer/player_notifier.h
+++ b/mediaPlayer/player_notifier.h
@@ -76,6 +76,7 @@ namespace Cicada {
 
         void NotifyAutoPlayStart();
 
+        void NotifyVideoRendered(int64_t timeMs, int64_t pts);
     private:
 
         void NotifyVoidEvent(playerVoidCallback listener);
diff --git a/mediaPlayer/player_types.cpp b/mediaPlayer/player_types.cpp
index b20d218d7..8a9329200 100644
--- a/mediaPlayer/player_types.cpp
+++ b/mediaPlayer/player_types.cpp
@@ -47,6 +47,8 @@ namespace Cicada {
         clearShowWhenStop = false;
         bEnableTunnelRender = false;
         bEnableHwVideoDecode = true;
+        // don't need reset for each playback
+//        bEnableVRC = false;
 #if TARGET_OS_IPHONE
         lowMemSize = 50 * 1024 * 1024;// 50M
 #else
diff --git a/mediaPlayer/player_types.h b/mediaPlayer/player_types.h
index d08423cb5..9f6575b76 100644
--- a/mediaPlayer/player_types.h
+++ b/mediaPlayer/player_types.h
@@ -56,6 +56,9 @@ namespace Cicada {
         int64_t AnalyticsID = -1;
         int mDefaultBandWidth = 0;
         playerOptions mOptions;
+
+
+        bool bEnableVRC = false;
     };
 }