diff --git a/trunk/src/libs/srs_librtmp.cpp b/trunk/src/libs/srs_librtmp.cpp
index 8cecda9a3..7a60183b5 100644
--- a/trunk/src/libs/srs_librtmp.cpp
+++ b/trunk/src/libs/srs_librtmp.cpp
@@ -473,16 +473,6 @@ srs_flv_t srs_flv_open(const char* file)
     
     FlvContext* flv = new FlvContext();
     
-    if ((ret = flv->reader.open(file)) != ERROR_SUCCESS) {
-        srs_freep(flv);
-        return NULL;
-    }
-    
-    if ((ret = flv->dec.initialize(&flv->reader)) != ERROR_SUCCESS) {
-        srs_freep(flv);
-        return NULL;
-    }
-    
     if ((ret = flv->writer.open(file)) != ERROR_SUCCESS) {
         srs_freep(flv);
         return NULL;
@@ -493,6 +483,16 @@ srs_flv_t srs_flv_open(const char* file)
         return NULL;
     }
     
+    if ((ret = flv->reader.open(file)) != ERROR_SUCCESS) {
+        srs_freep(flv);
+        return NULL;
+    }
+    
+    if ((ret = flv->dec.initialize(&flv->reader)) != ERROR_SUCCESS) {
+        srs_freep(flv);
+        return NULL;
+    }
+    
     return flv;
 }
 
diff --git a/trunk/src/libs/srs_librtmp.hpp b/trunk/src/libs/srs_librtmp.hpp
index 04617fe74..ae87de6e9 100644
--- a/trunk/src/libs/srs_librtmp.hpp
+++ b/trunk/src/libs/srs_librtmp.hpp
@@ -165,6 +165,7 @@ int64_t srs_get_nrecv_bytes(srs_rtmp_t rtmp);
 */
 typedef void* srs_flv_t;
 typedef int flv_bool;
+/* open flv file for both read/write. */
 srs_flv_t srs_flv_open(const char* file);
 void srs_flv_close(srs_flv_t flv);
 /* read the flv header. 9bytes header. drop the 4bytes zero previous tag size */