diff --git a/src/Rtp/Decoder.cpp b/src/Rtp/Decoder.cpp
index a2e3f88a..dcf1ba0d 100644
--- a/src/Rtp/Decoder.cpp
+++ b/src/Rtp/Decoder.cpp
@@ -101,7 +101,17 @@ static const char *getCodecName(int codec_id) {
 }
 
 void FrameMerger::inputFrame(const Frame::Ptr &frame,const function<void(uint32_t dts,uint32_t pts,const Buffer::Ptr &buffer)> &cb){
-    if (!_frameCached.empty() && _frameCached.back()->dts() != frame->dts()) {
+    bool flush = false;
+    switch (frame->getCodecId()) {
+        case CodecH264:
+        case CodecH265:{
+            //如果是新的一帧，前面的缓存需要输出
+            flush = frame->prefixSize();
+            break;
+        }
+        default: break;
+    }
+    if (!_frameCached.empty() && (flush || _frameCached.back()->dts() != frame->dts())) {
         Frame::Ptr back = _frameCached.back();
         Buffer::Ptr merged_frame = back;
         if(_frameCached.size() != 1){
@@ -177,7 +187,7 @@ void DecoderImp::onDecode(int stream,int codecid,int flags,int64_t pts,int64_t d
 
     switch (codecid) {
         case PSI_STREAM_H264: {
-            auto frame = std::make_shared<H264FrameNoCacheAble>((char *) data, bytes, (uint32_t)dts, (uint32_t)pts,0);
+            auto frame = std::make_shared<H264FrameNoCacheAble>((char *) data, bytes, (uint32_t)dts, (uint32_t)pts, prefixSize((char *) data, bytes));
             _merger.inputFrame(frame,[this](uint32_t dts, uint32_t pts, const Buffer::Ptr &buffer) {
                 onFrame(std::make_shared<FrameWrapper<H264FrameNoCacheAble> >(buffer, dts, pts, prefixSize(buffer->data(), buffer->size()), 0));
             });
@@ -185,7 +195,7 @@ void DecoderImp::onDecode(int stream,int codecid,int flags,int64_t pts,int64_t d
         }
 
         case PSI_STREAM_H265: {
-            auto frame = std::make_shared<H265FrameNoCacheAble>((char *) data, bytes, (uint32_t)dts, (uint32_t)pts, 0);
+            auto frame = std::make_shared<H265FrameNoCacheAble>((char *) data, bytes, (uint32_t)dts, (uint32_t)pts, prefixSize((char *) data, bytes));
             _merger.inputFrame(frame,[this](uint32_t dts, uint32_t pts, const Buffer::Ptr &buffer) {
                 onFrame(std::make_shared<FrameWrapper<H265FrameNoCacheAble> >(buffer, dts, pts, prefixSize(buffer->data(), buffer->size()), 0));
             });