diff --git a/src/Extension/H264.cpp b/src/Extension/H264.cpp
index 3426f5cc..4587f0be 100644
--- a/src/Extension/H264.cpp
+++ b/src/Extension/H264.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
@@ -142,6 +142,17 @@ float H264Track::getVideoFps() const {
     return _fps;
 }
 
+void H264Track::flush() const {
+    int w = 0;
+    int h = 0;
+    float fps = 0.0;
+    if(getAVCInfo(_sps, w, h, fps)){
+        _width = w;
+        _height = h;
+        _fps = fps;
+    }
+}
+
 bool H264Track::ready() {
     return !_sps.empty() && !_pps.empty();
 }