diff --git a/trunk/src/kernel/srs_kernel_flv.cpp b/trunk/src/kernel/srs_kernel_flv.cpp
index f24dc2047..411b42596 100644
--- a/trunk/src/kernel/srs_kernel_flv.cpp
+++ b/trunk/src/kernel/srs_kernel_flv.cpp
@@ -194,8 +194,11 @@ srs_error_t SrsCommonMessage::create(SrsMessageHeader* pheader, char* body, int
     return srs_success;
 }
 
-SrsSharedMessageHeader::SrsSharedMessageHeader() : payload_length(0), message_type(0), perfer_cid(0)
+SrsSharedMessageHeader::SrsSharedMessageHeader()
 {
+    payload_length = 0;
+    message_type = 0;
+    perfer_cid = 0;
 }
 
 SrsSharedMessageHeader::~SrsSharedMessageHeader()
@@ -207,6 +210,12 @@ SrsSharedPtrMessage::SrsSharedPtrPayload::SrsSharedPtrPayload()
     payload = NULL;
     size = 0;
     shared_count = 0;
+
+    samples = NULL;
+    nb_samples = 0;
+
+    extra_payload = NULL;
+    extra_size = 0;
 }
 
 SrsSharedPtrMessage::SrsSharedPtrPayload::~SrsSharedPtrPayload()
@@ -215,6 +224,8 @@ SrsSharedPtrMessage::SrsSharedPtrPayload::~SrsSharedPtrPayload()
     srs_memory_unwatch(payload);
 #endif
     srs_freepa(payload);
+    srs_freepa(samples);
+    srs_freepa(extra_payload);
 }
 
 SrsSharedPtrMessage::SrsSharedPtrMessage() : timestamp(0), stream_id(0), size(0), payload(NULL)
diff --git a/trunk/src/kernel/srs_kernel_flv.hpp b/trunk/src/kernel/srs_kernel_flv.hpp
index 23fa0baf0..397439b7c 100644
--- a/trunk/src/kernel/srs_kernel_flv.hpp
+++ b/trunk/src/kernel/srs_kernel_flv.hpp
@@ -40,6 +40,7 @@ class ISrsReader;
 class SrsFileReader;
 class SrsPacket;
 class SrsRtpSharedPacket;
+class SrsSample;
 
 #define SRS_FLV_TAG_HEADER_SIZE 11
 #define SRS_FLV_PREVIOUS_TAG_SIZE 4
@@ -287,7 +288,6 @@ public:
     // @remark, not all message payload can be decoded to packet. for example,
     //       video/audio packet use raw bytes, no video/audio packet.
     char* payload;
-
 #ifdef SRS_AUTO_RTC
     std::vector<SrsRtpSharedPacket*> rtp_packets;
 #endif
@@ -305,6 +305,15 @@ private:
         int size;
         // The reference count
         int shared_count;
+    public:
+        // For RTC video, we need to know the NALU structures,
+        // because the RTP STAP-A or FU-A based on NALU.
+        SrsSample* samples;
+        int nb_samples;
+        // For RTC audio, we may need to transcode AAC to opus,
+        // so there must be an extra payload, which is transformed from payload.
+        char* extra_payload;
+        int extra_size;
     public:
         SrsSharedPtrPayload();
         virtual ~SrsSharedPtrPayload();