diff --git a/trunk/conf/demo.conf b/trunk/conf/demo.conf
index 4c29eebfa..e5cfdab6f 100644
--- a/trunk/conf/demo.conf
+++ b/trunk/conf/demo.conf
@@ -202,12 +202,7 @@ vhost players_chat {
             vparams {
                 g           30;
             }
-            acodec          libaacplus;
-            abitrate        30;
-            asample_rate    44100;
-            achannels       2;
-            aparams {
-            }
+            acodec          an;
             output          rtmp://127.0.0.1:[port]/[app]?vhost=chat_hls/[stream];
         }
     }
diff --git a/trunk/src/app/srs_app_thread.cpp b/trunk/src/app/srs_app_thread.cpp
index 7b7f96bfe..3e360bef2 100644
--- a/trunk/src/app/srs_app_thread.cpp
+++ b/trunk/src/app/srs_app_thread.cpp
@@ -122,12 +122,12 @@ void SrsThread::thread_cycle()
 {
     int ret = ERROR_SUCCESS;
     
-    _cid = _srs_context->get_id();
-    srs_assert(handler);
-    
     _srs_context->generate_id();
     srs_info("thread cycle start");
-
+    
+    _cid = _srs_context->get_id();
+    
+    srs_assert(handler);
     handler->on_thread_start();
     
     loop = true;