diff --git a/trunk/src/app/srs_app_edge.cpp b/trunk/src/app/srs_app_edge.cpp
index 8c057af51..d59393daf 100644
--- a/trunk/src/app/srs_app_edge.cpp
+++ b/trunk/src/app/srs_app_edge.cpp
@@ -579,7 +579,6 @@ srs_error_t SrsEdgeForwarder::do_cycle()
             SrsCommonMessage* msg = NULL;
             err = sdk->recv_message(&msg);
             
-            srs_verbose("edge loop recv message. ret=%d", ret);
             if (err != srs_success && srs_error_code(err) != ERROR_SOCKET_TIMEOUT) {
                 srs_error("edge push get server control message failed. err=%s", srs_error_desc(err).c_str());
                 send_error_code = srs_error_code(err);
diff --git a/trunk/src/app/srs_app_pithy_print.cpp b/trunk/src/app/srs_app_pithy_print.cpp
index f31b44e51..9aacf3bfe 100644
--- a/trunk/src/app/srs_app_pithy_print.cpp
+++ b/trunk/src/app/srs_app_pithy_print.cpp
@@ -186,8 +186,8 @@ int SrsPithyPrint::enter_stage()
     srs_assert(stage != NULL);
     client_id = stage->nb_clients++;
     
-    srs_verbose("enter stage, stage_id=%d, client_id=%d, nb_clients=%d, time_ms=%d",
-                stage->stage_id, client_id, stage->nb_clients, stage->pithy_print_time_ms);
+    srs_verbose("enter stage, stage_id=%d, client_id=%d, nb_clients=%d",
+                stage->stage_id, client_id, stage->nb_clients);
     
     return client_id;
 }
@@ -199,8 +199,8 @@ void SrsPithyPrint::leave_stage()
     
     stage->nb_clients--;
     
-    srs_verbose("leave stage, stage_id=%d, client_id=%d, nb_clients=%d, time_ms=%d",
-                stage->stage_id, client_id, stage->nb_clients, stage->pithy_print_time_ms);
+    srs_verbose("leave stage, stage_id=%d, client_id=%d, nb_clients=%d",
+                stage->stage_id, client_id, stage->nb_clients);
 }
 
 void SrsPithyPrint::elapse()
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 13e74f636..78df5e643 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -1095,9 +1095,8 @@ srs_error_t SrsRtcSession::on_rtp(SrsUdpMuxSocket* udp_mux_skt)
     uint32_t timestamp = stream->read_4bytes();
     uint32_t ssrc = stream->read_4bytes();
 
-    (void)padding; (void)marker; (void)sequence; (void)timestamp; (void)ssrc;
-    srs_verbose("sequence=%u, timestamp=%u, ssrc=%u, padding=%d, ext=%d, cc=%u, marker=%d, payload_type=%u", 
-        sequence, timestamp, ssrc, padding, ext, cc, marker, payload_type);
+    srs_verbose("sequence=%u, timestamp=%u, ssrc=%u, padding=%d, ext=%d, cc=%u, marker=%d", 
+        sequence, timestamp, ssrc, padding, ext, cc, marker);
 
     for (uint8_t i = 0; i < cc; ++i) {
         /*uint32_t csrc = */stream->read_4bytes();
diff --git a/trunk/src/app/srs_app_rtp.cpp b/trunk/src/app/srs_app_rtp.cpp
index de01bc54f..de8932018 100644
--- a/trunk/src/app/srs_app_rtp.cpp
+++ b/trunk/src/app/srs_app_rtp.cpp
@@ -79,6 +79,32 @@ srs_error_t SrsRtpMuxer::frame_to_packet(SrsSharedPtrMessage* shared_frame, SrsF
         uint8_t header = sample.bytes[0];
         uint8_t nal_type = header & kNalTypeMask;
 
+        // TODO: Use config to determine should check avc stream.
+        if (nal_type == SrsAvcNaluTypeNonIDR || nal_type == SrsAvcNaluTypeDataPartitionA || nal_type == SrsAvcNaluTypeIDR) {
+            SrsBuffer* stream = new SrsBuffer(sample.bytes, sample.size);
+            SrsAutoFree(SrsBuffer, stream);
+
+            // Skip nalu header.
+            stream->skip(1);
+
+            SrsBitBuffer bitstream(stream);
+            int32_t first_mb_in_slice = 0;
+            if ((err = srs_avc_nalu_read_uev(&bitstream, first_mb_in_slice)) != srs_success) {
+                return srs_error_wrap(err, "nalu read uev");
+            }
+
+            int32_t slice_type = 0;
+            if ((err = srs_avc_nalu_read_uev(&bitstream, slice_type)) != srs_success) {
+                return srs_error_wrap(err, "nalu read uev");
+            }
+
+            srs_verbose("nal_type=%d, slice type=%d", nal_type, slice_type);
+            // TODO: Use config to determine how to process B frame
+            if (slice_type == SrsAvcSliceTypeB || slice_type == SrsAvcSliceTypeB1) {
+                continue;
+            }
+        }
+
         if (sample.size <= max_payload_size) {
             if ((err = packet_single_nalu(shared_frame, format, &sample, rtp_packet_vec)) != srs_success) {
                 return srs_error_wrap(err, "packet single nalu");
@@ -112,7 +138,7 @@ srs_error_t SrsRtpMuxer::packet_fu_a(SrsSharedPtrMessage* shared_frame, SrsForma
     uint8_t header = sample->bytes[0];
     uint8_t nal_type = header & kNalTypeMask;
 
-    if (nal_type == kIdr) {
+    if (nal_type == SrsAvcNaluTypeIDR) {
         if ((err = packet_stap_a(sps, pps, shared_frame, rtp_packet_vec)) != srs_success) {
             return srs_error_wrap(err, "packet stap-a");
         }
@@ -153,6 +179,11 @@ srs_error_t SrsRtpMuxer::packet_fu_a(SrsSharedPtrMessage* shared_frame, SrsForma
         p += packet_size;
         nb_left -= packet_size;
 
+        srs_verbose("rtp fu-a nalu, size=%u, seq=%u, timestamp=%lu, ssrc=%u, payloadtype=%u, rtp header=%s, payload=%s", 
+            sample->size, sequence, (shared_frame->timestamp * 90), kVideoSSRC, kH264PayloadType, 
+            srs_string_dumps_hex(stream->data(), 12).c_str(),
+            srs_string_dumps_hex(stream->data() + 12, stream->pos() - 12).c_str());
+
 
         SrsRtpSharedPacket* rtp_shared_pkt = new SrsRtpSharedPacket();
         rtp_shared_pkt->create((shared_frame->timestamp * 90), sequence++, kVideoSSRC, kH264PayloadType, stream->data(), stream->pos());
@@ -174,7 +205,7 @@ srs_error_t SrsRtpMuxer::packet_single_nalu(SrsSharedPtrMessage* shared_frame, S
     SrsBuffer* stream = new SrsBuffer(buf, kRtpPacketSize);
     SrsAutoFree(SrsBuffer, stream);
 
-    if (nal_type == kIdr) {
+    if (nal_type == SrsAvcNaluTypeIDR) {
         if ((err = packet_stap_a(sps, pps, shared_frame, rtp_packet_vec)) != srs_success) {
             return srs_error_wrap(err, "packet stap-a");
         }
@@ -193,6 +224,12 @@ srs_error_t SrsRtpMuxer::packet_single_nalu(SrsSharedPtrMessage* shared_frame, S
 
     stream->write_bytes(sample->bytes, sample->size);
 
+    srs_verbose("sample=%s", srs_string_dumps_hex(sample->bytes, sample->size).c_str());
+    srs_verbose("rtp single nalu, size=%u, seq=%u, timestamp=%lu, ssrc=%u, payloadtype=%u, rtp header=%s, payload=%s", 
+        sample->size, sequence, (shared_frame->timestamp * 90), kVideoSSRC, kH264PayloadType, 
+        srs_string_dumps_hex(stream->data(), 12).c_str(),
+        srs_string_dumps_hex(stream->data() + 12, stream->pos() - 12).c_str());
+
     SrsRtpSharedPacket* rtp_shared_pkt = new SrsRtpSharedPacket();
     rtp_shared_pkt->create((shared_frame->timestamp * 90), sequence++, kVideoSSRC, kH264PayloadType, stream->data(), stream->pos());
 
@@ -238,6 +275,11 @@ srs_error_t SrsRtpMuxer::packet_stap_a(const string &sps, const string& pps, Srs
     stream->write_2bytes(pps.size());
     stream->write_bytes((char*)pps.data(), pps.size());
 
+    srs_verbose("rtp stap-a nalu, size=%u, seq=%u, timestamp=%lu, ssrc=%u, payloadtype=%u, rtp header=%s, payload=%s", 
+        (sps.size() + pps.size()), sequence, (shared_frame->timestamp * 90), kVideoSSRC, kH264PayloadType, 
+        srs_string_dumps_hex(stream->data(), 12).c_str(),
+        srs_string_dumps_hex(stream->data() + 12, stream->pos() - 12).c_str());
+
     SrsRtpSharedPacket* rtp_shared_pkt = new SrsRtpSharedPacket();
     rtp_shared_pkt->create((shared_frame->timestamp * 90), sequence++, kVideoSSRC, kH264PayloadType, stream->data(), stream->pos());
 
diff --git a/trunk/src/app/srs_app_rtp.hpp b/trunk/src/app/srs_app_rtp.hpp
index 212bf776c..842d82620 100644
--- a/trunk/src/app/srs_app_rtp.hpp
+++ b/trunk/src/app/srs_app_rtp.hpp
@@ -44,12 +44,11 @@ const uint8_t kH264PayloadType = 102;
 
 const uint8_t kNalTypeMask = 0x1F;
 
-const uint8_t kIdr = 5;
-const uint8_t kStapA = 24; 
-const uint8_t kFuA = 28; 
+const uint8_t kStapA = 24;
+const uint8_t kFuA   = 28;
 
 const uint8_t kStart = 0x80;
-const uint8_t kEnd = 0x40;
+const uint8_t kEnd   = 0x40;
 
 // FIXME: ssrc can relate to source
 const uint32_t kVideoSSRC = 3233846889;
diff --git a/trunk/src/kernel/srs_kernel_codec.hpp b/trunk/src/kernel/srs_kernel_codec.hpp
index a8d674c2b..c820cbeef 100644
--- a/trunk/src/kernel/srs_kernel_codec.hpp
+++ b/trunk/src/kernel/srs_kernel_codec.hpp
@@ -398,6 +398,24 @@ enum SrsAvcNaluType
 };
 std::string srs_avc_nalu2str(SrsAvcNaluType nalu_type);
 
+/**
+ * Table 7-6 – Name association to slice_type
+ * ISO_IEC_14496-10-AVC-2012.pdf, page 105.
+ */
+enum SrsAvcSliceType
+{
+    SrsAvcSliceTypeP   = 0,
+    SrsAvcSliceTypeB   = 1,
+    SrsAvcSliceTypeI   = 2,
+    SrsAvcSliceTypeSP  = 3,
+    SrsAvcSliceTypeSI  = 4,
+    SrsAvcSliceTypeP1  = 5,
+    SrsAvcSliceTypeB1  = 6,
+    SrsAvcSliceTypeI1  = 7,
+    SrsAvcSliceTypeSP1 = 8,
+    SrsAvcSliceTypeSI1 = 9,
+};
+
 /**
  * the avc payload format, must be ibmf or annexb format.
  * we guess by annexb first, then ibmf for the first time,