diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index e63be65dc..e4f57800d 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -469,6 +469,8 @@ SrsRtcPackets::SrsRtcPackets()
     nn_audios = nn_extras = 0;
     nn_videos = nn_samples = 0;
     nn_paddings = 0;
+
+    cursor = 0;
 }
 
 SrsRtcPackets::~SrsRtcPackets()
@@ -481,12 +483,38 @@ void SrsRtcPackets::reset(bool gso, bool merge_nalus)
     use_gso = gso;
     should_merge_nalus = merge_nalus;
 
-    vector<SrsRtpPacket2*>::iterator it;
-    for (it = packets.begin(); it != packets.end(); ++it ) {
-        SrsRtpPacket2* packet = *it;
-        srs_freep(packet);
+    for (int i = 0; i < cursor; i++) {
+        SrsRtpPacket2* packet = packets[i];
+        packet->reset();
     }
-    packets.clear();
+
+    cursor = 0;
+}
+
+SrsRtpPacket2* SrsRtcPackets::fetch()
+{
+    if (cursor >= (int)packets.size()) {
+        packets.push_back(new SrsRtpPacket2());
+    }
+
+    return packets[cursor++];
+}
+
+SrsRtpPacket2* SrsRtcPackets::back()
+{
+    srs_assert(cursor > 0);
+    return packets[cursor - 1];
+}
+
+int SrsRtcPackets::size()
+{
+    return cursor;
+}
+
+SrsRtpPacket2* SrsRtcPackets::at(int index)
+{
+    srs_assert(index < cursor);
+    return packets[index];
 }
 
 SrsRtcSenderThread::SrsRtcSenderThread(SrsRtcSession* s, SrsUdpMuxSocket* u, int parent_cid)
@@ -684,12 +712,12 @@ srs_error_t SrsRtcSenderThread::cycle()
         int nn_rtc_packets = srs_max(pkts.nn_audios, pkts.nn_extras) + pkts.nn_videos;
         stat->perf_on_rtc_packets(nn_rtc_packets);
         // Stat the RAW RTP packets, which maybe group by GSO.
-        stat->perf_on_rtp_packets(pkts.packets.size());
+        stat->perf_on_rtp_packets(pkts.size());
         // Stat the RTP packets going into kernel.
         stat->perf_on_gso_packets(pkts.nn_rtp_pkts);
 #if defined(SRS_DEBUG)
         srs_trace("RTC PLAY done, msgs %d/%d, rtp %d, gso %d, %d audios, %d extras, %d videos, %d samples, %d bytes",
-            msg_count, nn_rtc_packets, pkts.packets.size(), pkts.nn_rtp_pkts, pkts.nn_audios, pkts.nn_extras, pkts.nn_videos,
+            msg_count, nn_rtc_packets, pkts.size(), pkts.nn_rtp_pkts, pkts.nn_audios, pkts.nn_extras, pkts.nn_videos,
             pkts.nn_samples, pkts.nn_bytes);
 #endif
 
@@ -697,7 +725,7 @@ srs_error_t SrsRtcSenderThread::cycle()
         if (pprint->can_print()) {
             // TODO: FIXME: Print stat like frame/s, packet/s, loss_packets.
             srs_trace("-> RTC PLAY %d msgs, %d/%d packets, %d audios, %d extras, %d videos, %d samples, %d bytes, %d pad",
-                msg_count, pkts.packets.size(), pkts.nn_rtp_pkts, pkts.nn_audios, pkts.nn_extras, pkts.nn_videos,
+                msg_count, pkts.size(), pkts.nn_rtp_pkts, pkts.nn_audios, pkts.nn_extras, pkts.nn_videos,
                 pkts.nn_samples, pkts.nn_bytes, pkts.nn_paddings);
         }
     }
@@ -753,16 +781,14 @@ srs_error_t SrsRtcSenderThread::messages_to_packets(
         packets.nn_samples += nn_samples;
 
         // For audio, we transcoded AAC to opus in extra payloads.
-        SrsRtpPacket2* packet = NULL;
         if (msg->is_audio()) {
             packets.nn_audios++;
 
             for (int i = 0; i < nn_extra_payloads; i++) {
                 SrsSample* sample = msg->extra_payloads() + i;
-                if ((err = packet_opus(sample, &packet)) != srs_success) {
+                if ((err = packet_opus(sample, packets)) != srs_success) {
                     return srs_error_wrap(err, "opus package");
                 }
-                packets.packets.push_back(packet);
             }
             continue;
         }
@@ -772,10 +798,9 @@ srs_error_t SrsRtcSenderThread::messages_to_packets(
 
         // Well, for each IDR, we append a SPS/PPS before it, which is packaged in STAP-A.
         if (msg->has_idr()) {
-            if ((err = packet_stap_a(source, msg, &packet)) != srs_success) {
+            if ((err = packet_stap_a(source, msg, packets)) != srs_success) {
                 return srs_error_wrap(err, "packet stap-a");
             }
-            packets.packets.push_back(packet);
         }
 
         // If merge Nalus, we pcakges all NALUs(samples) as one NALU, in a RTP or FUA packet.
@@ -797,10 +822,9 @@ srs_error_t SrsRtcSenderThread::messages_to_packets(
             }
 
             if (sample->size <= kRtpMaxPayloadSize) {
-                if ((err = packet_single_nalu(msg, sample, &packet)) != srs_success) {
+                if ((err = packet_single_nalu(msg, sample, packets)) != srs_success) {
                     return srs_error_wrap(err, "packet single nalu");
                 }
-                packets.packets.push_back(packet);
             } else {
                 if ((err = packet_fu_a(msg, sample, kRtpMaxPayloadSize, packets)) != srs_success) {
                     return srs_error_wrap(err, "packet fu-a");
@@ -808,7 +832,7 @@ srs_error_t SrsRtcSenderThread::messages_to_packets(
             }
 
             if (i == nn_samples - 1) {
-                packets.packets.back()->rtp_header.set_marker(true);
+                packets.back()->rtp_header.set_marker(true);
             }
         }
     }
@@ -822,9 +846,9 @@ srs_error_t SrsRtcSenderThread::send_packets(SrsUdpMuxSocket* skt, SrsRtcPackets
 
     ISrsUdpSender* sender = skt->sender();
 
-    vector<SrsRtpPacket2*>::iterator it;
-    for (it = packets.packets.begin(); it != packets.packets.end(); ++it) {
-        SrsRtpPacket2* packet = *it;
+    int nn_packets = packets.size();
+    for (int i = 0; i < nn_packets; i++) {
+        SrsRtpPacket2* packet = packets.at(i);
 
         // Fetch a cached message from queue.
         // TODO: FIXME: Maybe encrypt in async, so the state of mhdr maybe not ready.
@@ -832,6 +856,17 @@ srs_error_t SrsRtcSenderThread::send_packets(SrsUdpMuxSocket* skt, SrsRtcPackets
         if ((err = sender->fetch(&mhdr)) != srs_success) {
             return srs_error_wrap(err, "fetch msghdr");
         }
+
+        // Reset the iovec, we should never change the msg_iovlen.
+        for (int j = 0; j < (int)mhdr->msg_hdr.msg_iovlen; j++) {
+            iovec* p = mhdr->msg_hdr.msg_iov + j;
+
+            if (!p->iov_len) {
+                break;
+            }
+            p->iov_len = 0;
+        }
+
         char* buf = (char*)mhdr->msg_hdr.msg_iov->iov_base;
         int length = kRtpPacketSize;
 
@@ -882,15 +917,15 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsUdpMuxSocket* skt, SrsRtcPac
     bool use_gso = false; bool gso_final = false;
 
     ISrsUdpSender* sender = skt->sender();
-    int nn_packets = (int)packets.packets.size();
+    int nn_packets = packets.size();
     for (int i = 0; i < nn_packets; i++) {
-        SrsRtpPacket2* packet = packets.packets[i];
+        SrsRtpPacket2* packet = packets.at(i);
         int nn_packet = packet->nb_bytes();
 
         SrsRtpPacket2* next_packet = NULL;
         int nn_next_packet = 0;
         if (i < nn_packets - 1) {
-            next_packet = (i < nn_packets - 1)? packets.packets[i + 1]:NULL;
+            next_packet = (i < nn_packets - 1)? packets.at(i + 1):NULL;
             nn_next_packet = next_packet? next_packet->nb_bytes() : 0;
         }
 
@@ -1075,7 +1110,7 @@ srs_error_t SrsRtcSenderThread::send_packets_gso(SrsUdpMuxSocket* skt, SrsRtcPac
     }
 
 #if defined(SRS_DEBUG)
-    srs_trace("RTC PLAY summary, rtp %d/%d, videos %d/%d, audios %d/%d, pad %d", packets.packets.size(), packets.nn_rtp_pkts,
+    srs_trace("RTC PLAY summary, rtp %d/%d, videos %d/%d, audios %d/%d, pad %d", packets.size(), packets.nn_rtp_pkts,
         packets.nn_videos, packets.nn_samples, packets.nn_audios, packets.nn_extras, packets.nn_paddings);
 #endif
 
@@ -1109,13 +1144,12 @@ srs_error_t SrsRtcSenderThread::packet_nalus(SrsSharedPtrMessage* msg, SrsRtcPac
 
     if (nn_bytes < kRtpMaxPayloadSize) {
         // Package NALUs in a single RTP packet.
-        SrsRtpPacket2* packet = new SrsRtpPacket2();
+        SrsRtpPacket2* packet = packets.fetch();
         packet->rtp_header.set_timestamp(msg->timestamp * 90);
         packet->rtp_header.set_sequence(video_sequence++);
         packet->rtp_header.set_ssrc(video_ssrc);
         packet->rtp_header.set_payload_type(video_payload_type);
         packet->payload = raw;
-        packets.packets.push_back(packet);
     } else {
         SrsAutoFree(SrsRtpRawNALUs, raw);
 
@@ -1131,15 +1165,19 @@ srs_error_t SrsRtcSenderThread::packet_nalus(SrsSharedPtrMessage* msg, SrsRtcPac
         for (int i = 0; i < num_of_packet; ++i) {
             int packet_size = srs_min(nb_left, fu_payload_size);
 
-            SrsRtpPacket2* packet = new SrsRtpPacket2();
-            packets.packets.push_back(packet);
+            SrsRtpFUAPayload* fua = new SrsRtpFUAPayload();
+            if ((err = raw->read_samples(fua->nalus, packet_size)) != srs_success) {
+                srs_freep(fua);
+                return srs_error_wrap(err, "read samples %d bytes, left %d, total %d", packet_size, nb_left, nn_bytes);
+            }
+
+            SrsRtpPacket2* packet = packets.fetch();
 
             packet->rtp_header.set_timestamp(msg->timestamp * 90);
             packet->rtp_header.set_sequence(video_sequence++);
             packet->rtp_header.set_ssrc(video_ssrc);
             packet->rtp_header.set_payload_type(video_payload_type);
 
-            SrsRtpFUAPayload* fua = new SrsRtpFUAPayload();
             packet->payload = fua;
 
             fua->nri = (SrsAvcNaluType)header;
@@ -1147,26 +1185,22 @@ srs_error_t SrsRtcSenderThread::packet_nalus(SrsSharedPtrMessage* msg, SrsRtcPac
             fua->start = bool(i == 0);
             fua->end = bool(i == num_of_packet - 1);
 
-            if ((err = raw->read_samples(fua->nalus, packet_size)) != srs_success) {
-                return srs_error_wrap(err, "read samples %d bytes, left %d, total %d", packet_size, nb_left, nn_bytes);
-            }
-
             nb_left -= packet_size;
         }
     }
 
-    if (!packets.packets.empty()) {
-        packets.packets.back()->rtp_header.set_marker(true);
+    if (packets.size() > 0) {
+        packets.back()->rtp_header.set_marker(true);
     }
 
     return err;
 }
 
-srs_error_t SrsRtcSenderThread::packet_opus(SrsSample* sample, SrsRtpPacket2** ppacket)
+srs_error_t SrsRtcSenderThread::packet_opus(SrsSample* sample, SrsRtcPackets& packets)
 {
     srs_error_t err = srs_success;
 
-    SrsRtpPacket2* packet = new SrsRtpPacket2();
+    SrsRtpPacket2* packet = packets.fetch();
     packet->rtp_header.set_marker(true);
     packet->rtp_header.set_timestamp(audio_timestamp);
     packet->rtp_header.set_sequence(audio_sequence++);
@@ -1181,8 +1215,6 @@ srs_error_t SrsRtcSenderThread::packet_opus(SrsSample* sample, SrsRtpPacket2** p
     // TODO: FIXME: Why 960? Need Refactoring?
     audio_timestamp += 960;
 
-    *ppacket = packet;
-
     return err;
 }
 
@@ -1199,8 +1231,7 @@ srs_error_t SrsRtcSenderThread::packet_fu_a(SrsSharedPtrMessage* msg, SrsSample*
     for (int i = 0; i < num_of_packet; ++i) {
         int packet_size = srs_min(nb_left, fu_payload_size);
 
-        SrsRtpPacket2* packet = new SrsRtpPacket2();
-        packets.packets.push_back(packet);
+        SrsRtpPacket2* packet = packets.fetch();
 
         packet->rtp_header.set_timestamp(msg->timestamp * 90);
         packet->rtp_header.set_sequence(video_sequence++);
@@ -1228,11 +1259,11 @@ srs_error_t SrsRtcSenderThread::packet_fu_a(SrsSharedPtrMessage* msg, SrsSample*
 }
 
 // Single NAL Unit Packet @see https://tools.ietf.org/html/rfc6184#section-5.6
-srs_error_t SrsRtcSenderThread::packet_single_nalu(SrsSharedPtrMessage* msg, SrsSample* sample, SrsRtpPacket2** ppacket)
+srs_error_t SrsRtcSenderThread::packet_single_nalu(SrsSharedPtrMessage* msg, SrsSample* sample, SrsRtcPackets& packets)
 {
     srs_error_t err = srs_success;
 
-    SrsRtpPacket2* packet = new SrsRtpPacket2();
+    SrsRtpPacket2* packet = packets.fetch();
     packet->rtp_header.set_timestamp(msg->timestamp * 90);
     packet->rtp_header.set_sequence(video_sequence++);
     packet->rtp_header.set_ssrc(video_ssrc);
@@ -1246,12 +1277,10 @@ srs_error_t SrsRtcSenderThread::packet_single_nalu(SrsSharedPtrMessage* msg, Srs
     p->size = sample->size;
     raw->push_back(p);
 
-    *ppacket = packet;
-
     return err;
 }
 
-srs_error_t SrsRtcSenderThread::packet_stap_a(SrsSource* source, SrsSharedPtrMessage* msg, SrsRtpPacket2** ppacket)
+srs_error_t SrsRtcSenderThread::packet_stap_a(SrsSource* source, SrsSharedPtrMessage* msg, SrsRtcPackets& packets)
 {
     srs_error_t err = srs_success;
 
@@ -1271,7 +1300,7 @@ srs_error_t SrsRtcSenderThread::packet_stap_a(SrsSource* source, SrsSharedPtrMes
         return srs_error_new(ERROR_RTC_RTP_MUXER, "sps/pps empty");
     }
 
-    SrsRtpPacket2* packet = new SrsRtpPacket2();
+    SrsRtpPacket2* packet = packets.fetch();
     packet->rtp_header.set_marker(false);
     packet->rtp_header.set_timestamp(msg->timestamp * 90);
     packet->rtp_header.set_sequence(video_sequence++);
@@ -1298,8 +1327,6 @@ srs_error_t SrsRtcSenderThread::packet_stap_a(SrsSource* source, SrsSharedPtrMes
         stap->nalus.push_back(sample);
     }
 
-    *ppacket = packet;
-
     return err;
 }
 
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index c2edcd625..7dbf8eefb 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -140,13 +140,18 @@ public:
     int nn_videos;
     // The number of padded packet.
     int nn_paddings;
-public:
+private:
+    int cursor;
     std::vector<SrsRtpPacket2*> packets;
 public:
     SrsRtcPackets();
     virtual ~SrsRtcPackets();
 public:
     void reset(bool gso, bool merge_nalus);
+    SrsRtpPacket2* fetch();
+    SrsRtpPacket2* back();
+    int size();
+    SrsRtpPacket2* at(int index);
 };
 
 class SrsRtcSenderThread : virtual public ISrsCoroutineHandler, virtual public ISrsReloadHandler
@@ -195,12 +200,12 @@ private:
     srs_error_t send_packets(SrsUdpMuxSocket* skt, SrsRtcPackets& packets);
     srs_error_t send_packets_gso(SrsUdpMuxSocket* skt, SrsRtcPackets& packets);
 private:
-    srs_error_t packet_opus(SrsSample* sample, SrsRtpPacket2** ppacket);
+    srs_error_t packet_opus(SrsSample* sample, SrsRtcPackets& packets);
 private:
     srs_error_t packet_fu_a(SrsSharedPtrMessage* msg, SrsSample* sample, int fu_payload_size, SrsRtcPackets& packets);
     srs_error_t packet_nalus(SrsSharedPtrMessage* msg, SrsRtcPackets& packets);
-    srs_error_t packet_single_nalu(SrsSharedPtrMessage* msg, SrsSample* sample, SrsRtpPacket2** ppacket);
-    srs_error_t packet_stap_a(SrsSource* source, SrsSharedPtrMessage* msg, SrsRtpPacket2** ppacket);
+    srs_error_t packet_single_nalu(SrsSharedPtrMessage* msg, SrsSample* sample, SrsRtcPackets& packets);
+    srs_error_t packet_stap_a(SrsSource* source, SrsSharedPtrMessage* msg, SrsRtcPackets& packets);
 };
 
 class SrsRtcSession
diff --git a/trunk/src/kernel/srs_kernel_rtp.cpp b/trunk/src/kernel/srs_kernel_rtp.cpp
index 83dcf6071..ef33c057a 100644
--- a/trunk/src/kernel/srs_kernel_rtp.cpp
+++ b/trunk/src/kernel/srs_kernel_rtp.cpp
@@ -171,6 +171,13 @@ void SrsRtpPacket2::set_padding(int size)
     padding = size;
 }
 
+void SrsRtpPacket2::reset()
+{
+    memset((void*)&rtp_header, 0, sizeof(SrsRtpHeader));
+    padding = 0;
+    srs_freep(payload);
+}
+
 int SrsRtpPacket2::nb_bytes()
 {
     return rtp_header.header_size() + (payload? payload->nb_bytes():0) + padding;
diff --git a/trunk/src/kernel/srs_kernel_rtp.hpp b/trunk/src/kernel/srs_kernel_rtp.hpp
index 7733b431f..1b4fd2de6 100644
--- a/trunk/src/kernel/srs_kernel_rtp.hpp
+++ b/trunk/src/kernel/srs_kernel_rtp.hpp
@@ -88,7 +88,9 @@ public:
     virtual ~SrsRtpPacket2();
 public:
     // Append size of bytes as padding.
-    virtual void set_padding(int size);
+    void set_padding(int size);
+    // Reset RTP packet.
+    void reset();
 // interface ISrsEncoder
 public:
     virtual int nb_bytes();