diff --git a/src/Common/MediaSource.cpp b/src/Common/MediaSource.cpp
index a350704f..e2b4aee1 100644
--- a/src/Common/MediaSource.cpp
+++ b/src/Common/MediaSource.cpp
@@ -486,14 +486,22 @@ static bool isFlushAble_merge(bool is_audio, uint32_t last_stamp, uint32_t new_s
     return cache_size > 20;
 }
 
-bool FlushPolicy::isFlushAble(uint32_t last_stamp, uint32_t new_stamp, int cache_size) {
-    GET_CONFIG(bool,ultraLowDelay, General::kUltraLowDelay);
-    GET_CONFIG(int,mergeWriteMS, General::kMergeWriteMS);
-    if(ultraLowDelay || mergeWriteMS <= 0){
+bool FlushPolicy::isFlushAble(uint32_t new_stamp, int cache_size) {
+    bool ret = false;
+    GET_CONFIG(bool, ultraLowDelay, General::kUltraLowDelay);
+    GET_CONFIG(int, mergeWriteMS, General::kMergeWriteMS);
+    if (ultraLowDelay || mergeWriteMS <= 0) {
         //关闭了合并写或者合并写阈值小于等于0
-        return isFlushAble_default(_is_audio, last_stamp, new_stamp, cache_size);
+        ret = isFlushAble_default(_is_audio, _last_stamp, new_stamp, cache_size);
+    } else {
+        ret = isFlushAble_merge(_is_audio, _last_stamp, new_stamp, cache_size, mergeWriteMS);
     }
-    return isFlushAble_merge(_is_audio, last_stamp, new_stamp, cache_size,mergeWriteMS);
+
+    if (ret) {
+//        DebugL << _is_audio << " " << _last_stamp  << " " << new_stamp;
+        _last_stamp = new_stamp;
+    }
+    return ret;
 }
 
 } /* namespace mediakit */
\ No newline at end of file
diff --git a/src/Common/MediaSource.h b/src/Common/MediaSource.h
index cddfb272..ab0a0cfa 100644
--- a/src/Common/MediaSource.h
+++ b/src/Common/MediaSource.h
@@ -173,9 +173,10 @@ public:
         return packet->timeStamp;
     }
 
-    bool isFlushAble(uint32_t last_stamp, uint32_t new_stamp, int cache_size);
+    bool isFlushAble(uint32_t new_stamp, int cache_size);
 private:
     bool _is_audio;
+    uint32_t _last_stamp= 0;
 };
 
 /// 视频合并写缓存模板
@@ -192,14 +193,12 @@ public:
     virtual ~VideoPacketCache() = default;
 
     void inputVideo(const std::shared_ptr<packet> &rtp, bool key_pos) {
-        auto new_stamp = _policy.getStamp(rtp);
-        if (_policy.isFlushAble(_last_stamp, new_stamp, _cache->size())) {
+        if (_policy.isFlushAble(_policy.getStamp(rtp), _cache->size())) {
             flushAll();
         }
 
         //追加数据到最后
         _cache->emplace_back(rtp);
-        _last_stamp = new_stamp;
         if (key_pos) {
             _key_pos = key_pos;
         }
@@ -220,7 +219,6 @@ private:
 private:
     policy _policy;
     std::shared_ptr<packet_list> _cache;
-    uint32_t _last_stamp = 0;
     bool _key_pos = false;
 };
 
@@ -238,13 +236,11 @@ public:
     virtual ~AudioPacketCache() = default;
 
     void inputAudio(const std::shared_ptr<packet> &rtp) {
-        auto new_stamp = _policy.getStamp(rtp);
-        if (_policy.isFlushAble(_last_stamp, new_stamp, _cache->size())) {
+        if (_policy.isFlushAble(_policy.getStamp(rtp), _cache->size())) {
             flushAll();
         }
         //追加数据到最后
         _cache->emplace_back(rtp);
-        _last_stamp = new_stamp;
     }
 
     virtual void onFlushAudio(std::shared_ptr<packet_list> &) = 0;
@@ -261,7 +257,6 @@ private:
 private:
     policy _policy;
     std::shared_ptr<packet_list> _cache;
-    uint32_t _last_stamp = 0;
 };
 
 } /* namespace mediakit */