diff --git a/trunk/configure b/trunk/configure
index 8b5abd5dc..a4024d72f 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -7,7 +7,7 @@
 SRS_WORKDIR="."
 SRS_OBJS_DIR="objs"
 SRS_OBJS="${SRS_WORKDIR}/${SRS_OBJS_DIR}"
-mkdir -p ${SRS_OBJS}
+SRS_MAKEFILE="Makefile"
 
 # linux shell color support.
 RED="\\033[31m"
@@ -23,6 +23,9 @@ fi
 # remove makefile
 rm -f ${SRS_WORKDIR}/${SRS_MAKEFILE}
 
+# create objs
+mkdir -p ${SRS_OBJS}
+
 #####################################################################################
 # parse user options, set the variables like:
 # srs features: SRS_SSL/SRS_HLS/SRS_NGINX/SRS_FFMPEG_TOOL/SRS_HTTP_CALLBACK/......
@@ -43,11 +46,9 @@ rm -f ${SRS_WORKDIR}/${SRS_MAKEFILE}
 #####################################################################################
 # generate Makefile.
 #####################################################################################
-SRS_MAKEFILE="Makefile"
 # ubuntu echo in Makefile cannot display color, use bash instead
 SRS_BUILD_SUMMARY="_srs_build_summary.sh"
 
-#####################################################################################
 # srs-librtmp sample entry
 SrsLibrtmpSampleEntry="nossl"
 if [ $SRS_SSL = YES ]; then SrsLibrtmpSampleEntry="ssl";fi
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index 9e748b563..bcc73ef41 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -1101,3 +1101,4 @@ bool srs_directive_equals(SrsConfDirective* a, SrsConfDirective* b);
 extern SrsConfig* _srs_config;
 
 #endif
+
diff --git a/trunk/src/app/srs_app_http.cpp b/trunk/src/app/srs_app_http.cpp
index dfd772de0..aef7738d5 100644
--- a/trunk/src/app/srs_app_http.cpp
+++ b/trunk/src/app/srs_app_http.cpp
@@ -953,7 +953,7 @@ int SrsHttpResponseReader::read_chunked(std::string& data)
         }
         return ret;
     }
-    srs_trace("http: read %d chunk", ilength);
+    srs_info("http: read %d chunk", ilength);
     
     // read payload when length specifies some payload.
     if (ilength <= 0) {
diff --git a/trunk/src/app/srs_app_mpegts_udp.cpp b/trunk/src/app/srs_app_mpegts_udp.cpp
index d40a8fd19..885c342cc 100644
--- a/trunk/src/app/srs_app_mpegts_udp.cpp
+++ b/trunk/src/app/srs_app_mpegts_udp.cpp
@@ -130,11 +130,13 @@ SrsMpegtsOverUdp::SrsMpegtsOverUdp(SrsConfDirective* c)
     context = new SrsTsContext();
     buffer = new SrsSimpleBuffer();
     output = _srs_config->get_stream_caster_output(c);
+    
     req = NULL;
     io = NULL;
     client = NULL;
     stfd = NULL;
     stream_id = 0;
+    
     avc = new SrsRawH264Stream();
     aac = new SrsRawAacStream();
     h264_sps_changed = false;
@@ -159,8 +161,6 @@ SrsMpegtsOverUdp::~SrsMpegtsOverUdp()
 
 int SrsMpegtsOverUdp::on_udp_packet(sockaddr_in* from, char* buf, int nb_buf)
 {
-    int ret = ERROR_SUCCESS;
-
     std::string peer_ip = inet_ntoa(from->sin_addr);
     int peer_port = ntohs(from->sin_port);
 
@@ -169,6 +169,13 @@ int SrsMpegtsOverUdp::on_udp_packet(sockaddr_in* from, char* buf, int nb_buf)
 
     srs_info("udp: got %s:%d packet %d/%d bytes",
         peer_ip.c_str(), peer_port, nb_buf, buffer->length());
+        
+    return on_udp_bytes(peer_ip, peer_port, buf, nb_buf);
+}
+
+int SrsMpegtsOverUdp::on_udp_bytes(string host, int port, char* buf, int nb_buf)
+{
+    int ret = ERROR_SUCCESS;
 
     // collect nMB data to parse in a time.
     // TODO: FIXME: comment the following for release.
@@ -215,8 +222,7 @@ int SrsMpegtsOverUdp::on_udp_packet(sockaddr_in* from, char* buf, int nb_buf)
 
     // drop ts packet when size not modulus by 188
     if (buffer->length() < SRS_TS_PACKET_SIZE) {
-        srs_warn("udp: wait %s:%d packet %d/%d bytes",
-            peer_ip.c_str(), peer_port, nb_buf, buffer->length());
+        srs_warn("udp: wait %s:%d packet %d/%d bytes", host.c_str(), port, nb_buf, buffer->length());
         return ret;
     }
 
@@ -582,6 +588,7 @@ int SrsMpegtsOverUdp::connect()
     int ret = ERROR_SUCCESS;
 
     // when ok, ignore.
+    // TODO: FIXME: should reconnect when disconnected.
     if (io || client) {
         return ret;
     }
diff --git a/trunk/src/app/srs_app_mpegts_udp.hpp b/trunk/src/app/srs_app_mpegts_udp.hpp
index 7c8bdd6b0..39f2cb12b 100644
--- a/trunk/src/app/srs_app_mpegts_udp.hpp
+++ b/trunk/src/app/srs_app_mpegts_udp.hpp
@@ -109,6 +109,8 @@ public:
 // interface ISrsUdpHandler
 public:
     virtual int on_udp_packet(sockaddr_in* from, char* buf, int nb_buf);
+private:
+    virtual int on_udp_bytes(std::string host, int port, char* buf, int nb_buf);
 // interface ISrsTsHandler
 public:
     virtual int on_ts_message(SrsTsMessage* msg);
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index 1bdc95fce..9a9314c61 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -310,3 +310,4 @@ public:
 };
 
 #endif
+
diff --git a/trunk/src/kernel/srs_kernel_error.hpp b/trunk/src/kernel/srs_kernel_error.hpp
index ec8230482..e8a954914 100644
--- a/trunk/src/kernel/srs_kernel_error.hpp
+++ b/trunk/src/kernel/srs_kernel_error.hpp
@@ -247,6 +247,12 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_HTTP_RESPONSE_EOF             4025
 #define ERROR_HTTP_INVALID_CHUNK_HEADER     4026
 
+///////////////////////////////////////////////////////
+// user-define error.
+///////////////////////////////////////////////////////
+#define ERROR_USER_START                    9000
+#define ERROR_USER_END                      9999
+
 /**
 * whether the error code is an system control error.
 */
diff --git a/trunk/src/kernel/srs_kernel_file.hpp b/trunk/src/kernel/srs_kernel_file.hpp
index 53a9f0e62..da7a83b50 100644
--- a/trunk/src/kernel/srs_kernel_file.hpp
+++ b/trunk/src/kernel/srs_kernel_file.hpp
@@ -82,6 +82,7 @@ public:
     virtual int open(std::string file);
     virtual void close();
 public:
+    // TODO: FIXME: extract interface.
     virtual bool is_open();
     virtual int64_t tellg();
     virtual void skip(int64_t size);
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 95b9b80cd..bb6ded30d 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -206,6 +206,11 @@ void check_macro_features()
     srs_warn("SRS %s is develop branch, please use %s instead", RTMP_SIG_SRS_VERSION, RTMP_SIG_SRS_RELEASE);
 #endif
 
+#if defined(SRS_AUTO_STREAM_CASTER)
+    #warning "stream caster is experiment feature."
+    srs_warn("stream caster is experiment feature.");
+#endif
+
 #if defined(SRS_PERF_SO_SNDBUF_SIZE) && !defined(SRS_PERF_MW_SO_SNDBUF)
     #error "SRS_PERF_SO_SNDBUF_SIZE depends on SRS_PERF_MW_SO_SNDBUF"
 #endif