diff --git a/fec_manager.cpp b/fec_manager.cpp
index 99a6b91..2e2686b 100644
--- a/fec_manager.cpp
+++ b/fec_manager.cpp
@@ -574,10 +574,13 @@ int fec_decode_manager_t::input(char *s,int len)
 		}
 	}
 
+	//mylog(log_info,"mp.size()=%d index=%d\n",mp.size(),index);
+
 	if(fec_data[index].used!=0)
 	{
 		u32_t tmp_seq=fec_data[index].seq;
 		anti_replay.set_invaild(tmp_seq);
+
 		if(mp.find(tmp_seq)!=mp.end())
 		{
 			mp.erase(tmp_seq);
diff --git a/fec_manager.h b/fec_manager.h
index 801801f..f0f8fbc 100644
--- a/fec_manager.h
+++ b/fec_manager.h
@@ -167,19 +167,19 @@ class fec_decode_manager_t
 {
 	anti_replay_t anti_replay;
 	fec_data_t *fec_data;
-	int index;
 	unordered_map<u32_t, fec_group_t> mp;
 	blob_decode_t blob_decode;
 
-
+	int index;
 
 	int output_n;
 	char ** output_s_arr;
 	int * output_len_arr;
-	char *output_s_arr_buf[max_fec_packet_num+100];
-	int output_len_arr_buf[max_fec_packet_num+100];
 	int ready_for_output;
 
+	char *output_s_arr_buf[max_fec_packet_num+100];//only for type=1,for type=0 the buf inside blot_t is used
+	int output_len_arr_buf[max_fec_packet_num+100];//same
+
 public:
 	fec_decode_manager_t()
 	{
diff --git a/main.cpp b/main.cpp
index c21e1d3..ab57e9f 100644
--- a/main.cpp
+++ b/main.cpp
@@ -26,7 +26,7 @@ typedef int i32_t;
 
 int mtu_warn=1350;
 
-int disable_mtu_warn=0;
+int disable_mtu_warn=1;
 int disable_fec=0;
 
 int debug_force_flush_fec=0;