diff --git a/webrtc/modules/pacing/include/mock/mock_paced_sender.h b/webrtc/modules/pacing/include/mock/mock_paced_sender.h
index c8f2a180f8..3841ef3753 100644
--- a/webrtc/modules/pacing/include/mock/mock_paced_sender.h
+++ b/webrtc/modules/pacing/include/mock/mock_paced_sender.h
@@ -22,11 +22,12 @@ namespace webrtc {
 class MockPacedSender : public PacedSender {
  public:
   MockPacedSender() : PacedSender(NULL, 0, 0) {}
-  MOCK_METHOD5(SendPacket, bool(Priority priority,
+  MOCK_METHOD6(SendPacket, bool(Priority priority,
                                 uint32_t ssrc,
                                 uint16_t sequence_number,
                                 int64_t capture_time_ms,
-                                int bytes));
+                                int bytes,
+                                bool retransmission));
   MOCK_CONST_METHOD0(QueueInMs, int());
   MOCK_CONST_METHOD0(QueueInPackets, int());
 };
diff --git a/webrtc/modules/pacing/include/paced_sender.h b/webrtc/modules/pacing/include/paced_sender.h
index 3bd9896719..a0c1f1dfc1 100644
--- a/webrtc/modules/pacing/include/paced_sender.h
+++ b/webrtc/modules/pacing/include/paced_sender.h
@@ -43,8 +43,10 @@ class PacedSender : public Module {
     // module again.
     // Called when it's time to send a queued packet.
     // Returns false if packet cannot be sent.
-    virtual bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                  int64_t capture_time_ms) = 0;
+    virtual bool TimeToSendPacket(uint32_t ssrc,
+                                  uint16_t sequence_number,
+                                  int64_t capture_time_ms,
+                                  bool retransmission) = 0;
     // Called when it's a good time to send a padding data.
     virtual int TimeToSendPadding(int bytes) = 0;
    protected:
@@ -80,7 +82,8 @@ class PacedSender : public Module {
                           uint32_t ssrc,
                           uint16_t sequence_number,
                           int64_t capture_time_ms,
-                          int bytes);
+                          int bytes,
+                          bool retransmission);
 
   // Returns the time since the oldest queued packet was captured.
   virtual int QueueInMs() const;
@@ -99,7 +102,8 @@ class PacedSender : public Module {
 
   // Local helper function to GetNextPacket.
   void GetNextPacketFromList(paced_sender::PacketList* packets,
-      uint32_t* ssrc, uint16_t* sequence_number, int64_t* capture_time_ms);
+      uint32_t* ssrc, uint16_t* sequence_number, int64_t* capture_time_ms,
+      bool* retransmission);
 
   // Updates the number of bytes that can be sent for the next time interval.
   void UpdateBytesPerInterval(uint32_t delta_time_in_ms);
diff --git a/webrtc/modules/pacing/paced_sender.cc b/webrtc/modules/pacing/paced_sender.cc
index 49e8ef829b..ed9d29a0fa 100644
--- a/webrtc/modules/pacing/paced_sender.cc
+++ b/webrtc/modules/pacing/paced_sender.cc
@@ -36,16 +36,18 @@ namespace webrtc {
 namespace paced_sender {
 struct Packet {
   Packet(uint32_t ssrc, uint16_t seq_number, int64_t capture_time_ms,
-         int length_in_bytes)
+         int length_in_bytes, bool retransmission)
       : ssrc_(ssrc),
         sequence_number_(seq_number),
         capture_time_ms_(capture_time_ms),
-        bytes_(length_in_bytes) {
+        bytes_(length_in_bytes),
+        retransmission_(retransmission) {
   }
   uint32_t ssrc_;
   uint16_t sequence_number_;
   int64_t capture_time_ms_;
   int bytes_;
+  bool retransmission_;
 };
 
 // STL list style class which prevents duplicates in the list.
@@ -170,7 +172,8 @@ void PacedSender::UpdateBitrate(int target_bitrate_kbps,
 }
 
 bool PacedSender::SendPacket(Priority priority, uint32_t ssrc,
-    uint16_t sequence_number, int64_t capture_time_ms, int bytes) {
+    uint16_t sequence_number, int64_t capture_time_ms, int bytes,
+    bool retransmission) {
   CriticalSectionScoped cs(critsect_.get());
 
   if (!enabled_) {
@@ -198,7 +201,8 @@ bool PacedSender::SendPacket(Priority priority, uint32_t ssrc,
       break;
   }
   packet_list->push_back(paced_sender::Packet(ssrc, sequence_number,
-                                              capture_time_ms, bytes));
+                                              capture_time_ms, bytes,
+                                              retransmission));
   return false;
 }
 
@@ -253,14 +257,16 @@ int32_t PacedSender::Process() {
     uint32_t ssrc;
     uint16_t sequence_number;
     int64_t capture_time_ms;
+    bool retransmission;
     paced_sender::PacketList* packet_list;
     while (ShouldSendNextPacket(&packet_list)) {
       GetNextPacketFromList(packet_list, &ssrc, &sequence_number,
-                            &capture_time_ms);
+                            &capture_time_ms, &retransmission);
       critsect_->Leave();
 
       const bool success = callback_->TimeToSendPacket(ssrc, sequence_number,
-                                                       capture_time_ms);
+                                                       capture_time_ms,
+                                                       retransmission);
       critsect_->Enter();
       // If packet cannot be sent then keep it in packet list and exit early.
       // There's no need to send more packets.
@@ -339,12 +345,14 @@ bool PacedSender::ShouldSendNextPacket(paced_sender::PacketList** packet_list) {
 }
 
 void PacedSender::GetNextPacketFromList(paced_sender::PacketList* packets,
-    uint32_t* ssrc, uint16_t* sequence_number, int64_t* capture_time_ms) {
+    uint32_t* ssrc, uint16_t* sequence_number, int64_t* capture_time_ms,
+    bool* retransmission) {
   paced_sender::Packet packet = packets->front();
   UpdateMediaBytesSent(packet.bytes_);
   *sequence_number = packet.sequence_number_;
   *ssrc = packet.ssrc_;
   *capture_time_ms = packet.capture_time_ms_;
+  *retransmission = packet.retransmission_;
 }
 
 // MUST have critsect_ when calling.
diff --git a/webrtc/modules/pacing/paced_sender_unittest.cc b/webrtc/modules/pacing/paced_sender_unittest.cc
index 286c09747b..66a3383112 100644
--- a/webrtc/modules/pacing/paced_sender_unittest.cc
+++ b/webrtc/modules/pacing/paced_sender_unittest.cc
@@ -24,8 +24,9 @@ static const float kPaceMultiplier = 1.5f;
 
 class MockPacedSenderCallback : public PacedSender::Callback {
  public:
-  MOCK_METHOD3(TimeToSendPacket,
-      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms));
+  MOCK_METHOD4(TimeToSendPacket,
+      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms,
+           bool retransmission));
   MOCK_METHOD1(TimeToSendPadding,
       int(int bytes));
 };
@@ -35,7 +36,7 @@ class PacedSenderPadding : public PacedSender::Callback {
   PacedSenderPadding() : padding_sent_(0) {}
 
   bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                        int64_t capture_time_ms) {
+                        int64_t capture_time_ms, bool retransmission) {
     return true;
   }
 
@@ -65,11 +66,12 @@ class PacedSenderTest : public ::testing::Test {
 
   void SendAndExpectPacket(PacedSender::Priority priority,
                            uint32_t ssrc, uint16_t sequence_number,
-                           int64_t capture_time_ms, int size) {
+                           int64_t capture_time_ms, int size,
+                           bool retransmission) {
     EXPECT_FALSE(send_bucket_->SendPacket(priority, ssrc,
-        sequence_number, capture_time_ms, size));
+        sequence_number, capture_time_ms, size, retransmission));
     EXPECT_CALL(callback_, TimeToSendPacket(
-        ssrc, sequence_number, capture_time_ms))
+        ssrc, sequence_number, capture_time_ms, false))
         .Times(1)
         .WillRepeatedly(Return(true));
   }
@@ -84,34 +86,34 @@ TEST_F(PacedSenderTest, QueuePacket) {
   int64_t capture_time_ms = 56789;
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-      sequence_number, capture_time_ms, 250));
+      sequence_number, capture_time_ms, 250, false));
   send_bucket_->Process();
   EXPECT_EQ(5, send_bucket_->TimeUntilNextProcess());
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
   EXPECT_CALL(callback_,
-      TimeToSendPacket(ssrc, sequence_number, capture_time_ms)).Times(0);
+      TimeToSendPacket(ssrc, sequence_number, capture_time_ms, false)).Times(0);
   TickTime::AdvanceFakeClock(4);
   EXPECT_EQ(1, send_bucket_->TimeUntilNextProcess());
   TickTime::AdvanceFakeClock(1);
   EXPECT_EQ(0, send_bucket_->TimeUntilNextProcess());
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc, sequence_number++, capture_time_ms))
+      ssrc, sequence_number++, capture_time_ms, false))
       .Times(1)
       .WillRepeatedly(Return(true));
   send_bucket_->Process();
   sequence_number++;
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-      sequence_number++, capture_time_ms, 250));
+      sequence_number++, capture_time_ms, 250, false));
   send_bucket_->Process();
 }
 
@@ -123,11 +125,11 @@ TEST_F(PacedSenderTest, PaceQueuedPackets) {
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   for (int i = 0; i < 3; ++i) {
     SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                        capture_time_ms, 250);
+                        capture_time_ms, 250, false);
   }
   for (int j = 0; j < 30; ++j) {
     EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-        sequence_number++, capture_time_ms, 250));
+        sequence_number++, capture_time_ms, 250, false));
   }
   send_bucket_->Process();
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
@@ -135,7 +137,7 @@ TEST_F(PacedSenderTest, PaceQueuedPackets) {
     EXPECT_EQ(5, send_bucket_->TimeUntilNextProcess());
     TickTime::AdvanceFakeClock(5);
     EXPECT_CALL(callback_,
-        TimeToSendPacket(ssrc, _, capture_time_ms))
+        TimeToSendPacket(ssrc, _, capture_time_ms, false))
         .Times(3)
         .WillRepeatedly(Return(true));
     EXPECT_EQ(0, send_bucket_->TimeUntilNextProcess());
@@ -146,13 +148,13 @@ TEST_F(PacedSenderTest, PaceQueuedPackets) {
   EXPECT_EQ(0, send_bucket_->TimeUntilNextProcess());
   EXPECT_EQ(0, send_bucket_->Process());
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-      sequence_number, capture_time_ms, 250));
+      sequence_number, capture_time_ms, 250, false));
   send_bucket_->Process();
 }
 
@@ -165,16 +167,16 @@ TEST_F(PacedSenderTest, PaceQueuedPacketsWithDuplicates) {
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   for (int i = 0; i < 3; ++i) {
     SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                        capture_time_ms, 250);
+                        capture_time_ms, 250, false);
   }
   queued_sequence_number = sequence_number;
 
   for (int j = 0; j < 30; ++j) {
     // Send in duplicate packets.
     EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-        sequence_number, capture_time_ms, 250));
+        sequence_number, capture_time_ms, 250, false));
     EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-        sequence_number++, capture_time_ms, 250));
+        sequence_number++, capture_time_ms, 250, false));
   }
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
   send_bucket_->Process();
@@ -184,7 +186,7 @@ TEST_F(PacedSenderTest, PaceQueuedPacketsWithDuplicates) {
 
     for (int i = 0; i < 3; ++i) {
       EXPECT_CALL(callback_, TimeToSendPacket(ssrc, queued_sequence_number++,
-                                              capture_time_ms))
+                                              capture_time_ms, false))
           .Times(1)
           .WillRepeatedly(Return(true));
    }
@@ -196,13 +198,13 @@ TEST_F(PacedSenderTest, PaceQueuedPacketsWithDuplicates) {
   EXPECT_EQ(0, send_bucket_->TimeUntilNextProcess());
   EXPECT_EQ(0, send_bucket_->Process());
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
-      sequence_number++, capture_time_ms, 250));
+      sequence_number++, capture_time_ms, 250, false));
   send_bucket_->Process();
 }
 
@@ -214,11 +216,11 @@ TEST_F(PacedSenderTest, Padding) {
   send_bucket_->UpdateBitrate(kTargetBitrate, kTargetBitrate, kTargetBitrate);
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   // No padding is expected since we have sent too much already.
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
   EXPECT_EQ(5, send_bucket_->TimeUntilNextProcess());
@@ -261,7 +263,7 @@ TEST_F(PacedSenderTest, VerifyPaddingUpToBitrate) {
   int64_t start_time = TickTime::MillisecondTimestamp();
   while (TickTime::MillisecondTimestamp() - start_time < kBitrateWindow) {
     SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                        capture_time_ms, 250);
+                        capture_time_ms, 250, false);
     TickTime::AdvanceFakeClock(kTimeStep);
     EXPECT_CALL(callback_, TimeToSendPadding(250)).Times(1).
         WillOnce(Return(250));
@@ -282,7 +284,7 @@ TEST_F(PacedSenderTest, VerifyMaxPaddingBitrate) {
   int64_t start_time = TickTime::MillisecondTimestamp();
   while (TickTime::MillisecondTimestamp() - start_time < kBitrateWindow) {
     SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                        capture_time_ms, 250);
+                        capture_time_ms, 250, false);
     TickTime::AdvanceFakeClock(kTimeStep);
     EXPECT_CALL(callback_, TimeToSendPadding(500)).Times(1).
         WillOnce(Return(250));
@@ -307,7 +309,7 @@ TEST_F(PacedSenderTest, VerifyAverageBitrateVaryingMediaPayload) {
     int media_payload = rand() % 100 + 200;  // [200, 300] bytes.
     EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority, ssrc,
                                           sequence_number++, capture_time_ms,
-                                          media_payload));
+                                          media_payload, false));
     media_bytes += media_payload;
     TickTime::AdvanceFakeClock(kTimeStep);
     send_bucket_->Process();
@@ -325,26 +327,27 @@ TEST_F(PacedSenderTest, Priority) {
 
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   SendAndExpectPacket(PacedSender::kLowPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   send_bucket_->Process();
 
   // Expect normal and low priority to be queued and high to pass through.
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kLowPriority,
-      ssrc_low_priority, sequence_number++, capture_time_ms_low_priority, 250));
+      ssrc_low_priority, sequence_number++, capture_time_ms_low_priority, 250,
+      false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kHighPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
 
   // Expect all high and normal priority to be sent out first.
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
-  EXPECT_CALL(callback_, TimeToSendPacket(ssrc, _, capture_time_ms))
+  EXPECT_CALL(callback_, TimeToSendPacket(ssrc, _, capture_time_ms, false))
       .Times(3)
       .WillRepeatedly(Return(true));
 
@@ -354,7 +357,7 @@ TEST_F(PacedSenderTest, Priority) {
   EXPECT_EQ(0, send_bucket_->Process());
 
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc_low_priority, _, capture_time_ms_low_priority))
+      ssrc_low_priority, _, capture_time_ms_low_priority, false))
       .Times(1)
       .WillRepeatedly(Return(true));
 
@@ -376,31 +379,32 @@ TEST_F(PacedSenderTest, Pause) {
 
   // Due to the multiplicative factor we can send 3 packets not 2 packets.
   SendAndExpectPacket(PacedSender::kLowPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   SendAndExpectPacket(PacedSender::kNormalPriority, ssrc, sequence_number++,
-                      capture_time_ms, 250);
+                      capture_time_ms, 250, false);
   send_bucket_->Process();
 
   send_bucket_->Pause();
 
   // Expect everything to be queued.
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kLowPriority,
-      ssrc_low_priority, sequence_number++, second_capture_time_ms, 250));
+      ssrc_low_priority, sequence_number++, second_capture_time_ms, 250,
+      false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kHighPriority,
-      ssrc, sequence_number++, capture_time_ms, 250));
+      ssrc, sequence_number++, capture_time_ms, 250, false));
 
   EXPECT_EQ(TickTime::MillisecondTimestamp() - capture_time_ms,
             send_bucket_->QueueInMs());
 
   // Expect no packet to come out while paused.
   EXPECT_CALL(callback_, TimeToSendPadding(_)).Times(0);
-  EXPECT_CALL(callback_, TimeToSendPacket(_, _, _)).Times(0);
+  EXPECT_CALL(callback_, TimeToSendPacket(_, _, _, _)).Times(0);
 
   for (int i = 0; i < 10; ++i) {
     TickTime::AdvanceFakeClock(5);
@@ -409,7 +413,7 @@ TEST_F(PacedSenderTest, Pause) {
   }
   // Expect high prio packets to come out first followed by all packets in the
   // way they were added.
-  EXPECT_CALL(callback_, TimeToSendPacket(_, _, capture_time_ms))
+  EXPECT_CALL(callback_, TimeToSendPacket(_, _, capture_time_ms, false))
       .Times(3)
       .WillRepeatedly(Return(true));
   send_bucket_->Resume();
@@ -419,7 +423,7 @@ TEST_F(PacedSenderTest, Pause) {
   EXPECT_EQ(0, send_bucket_->TimeUntilNextProcess());
   EXPECT_EQ(0, send_bucket_->Process());
 
-  EXPECT_CALL(callback_, TimeToSendPacket(_, _, second_capture_time_ms))
+  EXPECT_CALL(callback_, TimeToSendPacket(_, _, second_capture_time_ms, false))
       .Times(1)
       .WillRepeatedly(Return(true));
   EXPECT_EQ(5, send_bucket_->TimeUntilNextProcess());
@@ -439,18 +443,20 @@ TEST_F(PacedSenderTest, ResendPacket) {
                                         ssrc,
                                         sequence_number,
                                         capture_time_ms,
-                                        250));
+                                        250,
+                                        false));
   EXPECT_FALSE(send_bucket_->SendPacket(PacedSender::kNormalPriority,
                                         ssrc,
                                         sequence_number + 1,
                                         capture_time_ms + 1,
-                                        250));
+                                        250,
+                                        false));
   TickTime::AdvanceFakeClock(10000);
   EXPECT_EQ(TickTime::MillisecondTimestamp() - capture_time_ms,
             send_bucket_->QueueInMs());
   // Fails to send first packet so only one call.
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc, sequence_number, capture_time_ms))
+      ssrc, sequence_number, capture_time_ms, false))
       .Times(1)
       .WillOnce(Return(false));
   TickTime::AdvanceFakeClock(10000);
@@ -462,11 +468,11 @@ TEST_F(PacedSenderTest, ResendPacket) {
 
   // Fails to send second packet.
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc, sequence_number, capture_time_ms))
+      ssrc, sequence_number, capture_time_ms, false))
       .Times(1)
       .WillOnce(Return(true));
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc, sequence_number + 1, capture_time_ms + 1))
+      ssrc, sequence_number + 1, capture_time_ms + 1, false))
       .Times(1)
       .WillOnce(Return(false));
   TickTime::AdvanceFakeClock(10000);
@@ -478,7 +484,7 @@ TEST_F(PacedSenderTest, ResendPacket) {
 
   // Send second packet and queue becomes empty.
   EXPECT_CALL(callback_, TimeToSendPacket(
-      ssrc, sequence_number + 1, capture_time_ms + 1))
+      ssrc, sequence_number + 1, capture_time_ms + 1, false))
       .Times(1)
       .WillOnce(Return(true));
   TickTime::AdvanceFakeClock(10000);
diff --git a/webrtc/modules/rtp_rtcp/interface/rtp_rtcp.h b/webrtc/modules/rtp_rtcp/interface/rtp_rtcp.h
index 4409e8e398..c0e6183d14 100644
--- a/webrtc/modules/rtp_rtcp/interface/rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/interface/rtp_rtcp.h
@@ -324,8 +324,10 @@ class RtpRtcp : public Module {
         const RTPFragmentationHeader* fragmentation = NULL,
         const RTPVideoHeader* rtpVideoHdr = NULL) = 0;
 
-    virtual bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                  int64_t capture_time_ms) = 0;
+    virtual bool TimeToSendPacket(uint32_t ssrc,
+                                  uint16_t sequence_number,
+                                  int64_t capture_time_ms,
+                                  bool retransmission) = 0;
 
     virtual int TimeToSendPadding(int bytes) = 0;
 
diff --git a/webrtc/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h b/webrtc/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
index fd7b9a942f..09c3ca623f 100644
--- a/webrtc/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
@@ -111,8 +111,9 @@ class MockRtpRtcp : public RtpRtcp {
               const uint32_t payloadSize,
               const RTPFragmentationHeader* fragmentation,
               const RTPVideoHeader* rtpVideoHdr));
-  MOCK_METHOD3(TimeToSendPacket,
-      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms));
+  MOCK_METHOD4(TimeToSendPacket,
+      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms,
+           bool retransmission));
   MOCK_METHOD1(TimeToSendPadding,
       int(int bytes));
   MOCK_METHOD3(RegisterRtcpObservers,
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
index 6caa18883e..f910a18135 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
@@ -660,7 +660,8 @@ int32_t ModuleRtpRtcpImpl::SendOutgoingData(
 
 bool ModuleRtpRtcpImpl::TimeToSendPacket(uint32_t ssrc,
                                          uint16_t sequence_number,
-                                         int64_t capture_time_ms) {
+                                         int64_t capture_time_ms,
+                                         bool retransmission) {
   WEBRTC_TRACE(
     kTraceStream,
     kTraceRtpRtcp,
@@ -676,7 +677,8 @@ bool ModuleRtpRtcpImpl::TimeToSendPacket(uint32_t ssrc,
   if (no_child_modules) {
     // Don't send from default module.
     if (SendingMedia() && ssrc == rtp_sender_.SSRC()) {
-      return rtp_sender_.TimeToSendPacket(sequence_number, capture_time_ms);
+      return rtp_sender_.TimeToSendPacket(sequence_number, capture_time_ms,
+                                          retransmission);
     }
   } else {
     CriticalSectionScoped lock(critical_section_module_ptrs_.get());
@@ -684,7 +686,8 @@ bool ModuleRtpRtcpImpl::TimeToSendPacket(uint32_t ssrc,
     while (it != child_modules_.end()) {
       if ((*it)->SendingMedia() && ssrc == (*it)->rtp_sender_.SSRC()) {
         return (*it)->rtp_sender_.TimeToSendPacket(sequence_number,
-                                                   capture_time_ms);
+                                                   capture_time_ms,
+                                                   retransmission);
       }
       ++it;
     }
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
index d7b2035a02..b29ec5713f 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
@@ -126,8 +126,10 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
       const RTPFragmentationHeader* fragmentation = NULL,
       const RTPVideoHeader* rtp_video_hdr = NULL) OVERRIDE;
 
-  virtual bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                int64_t capture_time_ms) OVERRIDE;
+  virtual bool TimeToSendPacket(uint32_t ssrc,
+                                uint16_t sequence_number,
+                                int64_t capture_time_ms,
+                                bool retransmission) OVERRIDE;
   // Returns the number of padding bytes actually sent, which can be more or
   // less than |bytes|.
   virtual int TimeToSendPadding(int bytes) OVERRIDE;
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender.cc
index d4980f2ead..5c63b58ee1 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender.cc
@@ -532,16 +532,6 @@ int32_t RTPSender::ReSendPacket(uint16_t packet_id, uint32_t min_resend_time) {
     return 0;
   }
 
-  uint8_t data_buffer_rtx[IP_PACKET_SIZE];
-  if (rtx_ != kRtxOff) {
-    BuildRtxPacket(data_buffer, &length, data_buffer_rtx);
-    buffer_to_send_ptr = data_buffer_rtx;
-  }
-
-  ModuleRTPUtility::RTPHeaderParser rtp_parser(data_buffer, length);
-  RTPHeader header;
-  rtp_parser.Parse(header);
-
   // Store the time when the packet was last sent or added to pacer.
   packet_history_->UpdateResendTime(packet_id);
 
@@ -554,6 +544,10 @@ int32_t RTPSender::ReSendPacket(uint16_t packet_id, uint32_t min_resend_time) {
     // re-transmit and not new payload data.
   }
 
+
+  ModuleRTPUtility::RTPHeaderParser rtp_parser(data_buffer, length);
+  RTPHeader header;
+  rtp_parser.Parse(header);
   TRACE_EVENT_INSTANT2("webrtc_rtp", "RTPSender::ReSendPacket",
                        "timestamp", header.timestamp,
                        "seqnum", header.sequenceNumber);
@@ -563,13 +557,20 @@ int32_t RTPSender::ReSendPacket(uint16_t packet_id, uint32_t min_resend_time) {
                                    header.ssrc,
                                    header.sequenceNumber,
                                    capture_time_ms,
-                                   length - header.headerLength)) {
+                                   length - header.headerLength,
+                                   true)) {
       // We can't send the packet right now.
       // We will be called when it is time.
       return length;
     }
   }
 
+  uint8_t data_buffer_rtx[IP_PACKET_SIZE];
+  if (rtx_ != kRtxOff) {
+    BuildRtxPacket(data_buffer, &length, data_buffer_rtx);
+    buffer_to_send_ptr = data_buffer_rtx;
+  }
+
   if (SendPacketToNetwork(buffer_to_send_ptr, length)) {
     return length;
   }
@@ -710,11 +711,13 @@ void RTPSender::UpdateNACKBitRate(const uint32_t bytes,
 
 // Called from pacer when we can send the packet.
 bool RTPSender::TimeToSendPacket(uint16_t sequence_number,
-                                 int64_t capture_time_ms) {
+                                 int64_t capture_time_ms,
+                                 bool retransmission) {
   StorageType type;
   uint16_t length = IP_PACKET_SIZE;
   uint8_t data_buffer[IP_PACKET_SIZE];
   int64_t stored_time_ms;
+  uint8_t *buffer_to_send_ptr = data_buffer;
 
   if (packet_history_ == NULL) {
     // Packet cannot be found. Allow sending to continue.
@@ -734,19 +737,26 @@ bool RTPSender::TimeToSendPacket(uint16_t sequence_number,
                        "timestamp", rtp_header.timestamp,
                        "seqnum", sequence_number);
 
+  uint8_t data_buffer_rtx[IP_PACKET_SIZE];
+  if (retransmission && rtx_ != kRtxOff) {
+    BuildRtxPacket(data_buffer, &length, data_buffer_rtx);
+    buffer_to_send_ptr = data_buffer_rtx;
+  }
+
   int64_t now_ms = clock_->TimeInMilliseconds();
   int64_t diff_ms = now_ms - capture_time_ms;
   bool updated_transmission_time_offset =
-      UpdateTransmissionTimeOffset(data_buffer, length, rtp_header, diff_ms);
+      UpdateTransmissionTimeOffset(buffer_to_send_ptr, length, rtp_header,
+                                   diff_ms);
   bool updated_abs_send_time =
-      UpdateAbsoluteSendTime(data_buffer, length, rtp_header, now_ms);
+      UpdateAbsoluteSendTime(buffer_to_send_ptr, length, rtp_header, now_ms);
   if (updated_transmission_time_offset || updated_abs_send_time) {
     // Update stored packet in case of receiving a re-transmission request.
-    packet_history_->ReplaceRTPHeader(data_buffer,
+    packet_history_->ReplaceRTPHeader(buffer_to_send_ptr,
                                       rtp_header.sequenceNumber,
                                       rtp_header.headerLength);
   }
-  return SendPacketToNetwork(data_buffer, length);
+  return SendPacketToNetwork(buffer_to_send_ptr, length);
 }
 
 int RTPSender::TimeToSendPadding(int bytes) {
@@ -822,7 +832,7 @@ int32_t RTPSender::SendToNetwork(
   if (paced_sender_ && storage != kDontStore) {
     if (!paced_sender_->SendPacket(priority, rtp_header.ssrc,
                                    rtp_header.sequenceNumber, capture_time_ms,
-                                   payload_length)) {
+                                   payload_length, false)) {
       // We can't send the packet right now.
       // We will be called when it is time.
       return 0;
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender.h b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
index e0ead82225..afa57f1536 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
@@ -167,7 +167,8 @@ class RTPSender : public Bitrate, public RTPSenderInterface {
                               const RTPHeader &rtp_header,
                               const int64_t now_ms) const;
 
-  bool TimeToSendPacket(uint16_t sequence_number, int64_t capture_time_ms);
+  bool TimeToSendPacket(uint16_t sequence_number, int64_t capture_time_ms,
+                        bool retransmission);
   int TimeToSendPadding(int bytes);
 
   // NACK.
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
index 83ee7f68df..b1f1b50fe7 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
@@ -82,7 +82,7 @@ class RtpSenderTest : public ::testing::Test {
       transport_(),
       kMarkerBit(true) {
     EXPECT_CALL(mock_paced_sender_,
-        SendPacket(_, _, _, _, _)).WillRepeatedly(testing::Return(true));
+        SendPacket(_, _, _, _, _, _)).WillRepeatedly(testing::Return(true));
   }
 
   virtual void SetUp() {
@@ -344,7 +344,7 @@ TEST_F(RtpSenderTest, BuildRTPPacketWithHeaderExtensions) {
 
 TEST_F(RtpSenderTest, TrafficSmoothingWithExtensions) {
   EXPECT_CALL(mock_paced_sender_,
-              SendPacket(PacedSender::kNormalPriority, _, kSeqNum, _, _)).
+              SendPacket(PacedSender::kNormalPriority, _, kSeqNum, _, _, _)).
                   WillOnce(testing::Return(false));
 
   rtp_sender_->SetStorePacketsStatus(true, 10);
@@ -373,7 +373,7 @@ TEST_F(RtpSenderTest, TrafficSmoothingWithExtensions) {
   const int kStoredTimeInMs = 100;
   fake_clock_.AdvanceTimeMilliseconds(kStoredTimeInMs);
 
-  rtp_sender_->TimeToSendPacket(kSeqNum, capture_time_ms);
+  rtp_sender_->TimeToSendPacket(kSeqNum, capture_time_ms, false);
 
   // Process send bucket. Packet should now be sent.
   EXPECT_EQ(1, transport_.packets_sent_);
@@ -398,7 +398,7 @@ TEST_F(RtpSenderTest, TrafficSmoothingWithExtensions) {
 
 TEST_F(RtpSenderTest, TrafficSmoothingRetransmits) {
   EXPECT_CALL(mock_paced_sender_,
-              SendPacket(PacedSender::kNormalPriority, _, kSeqNum, _, _)).
+              SendPacket(PacedSender::kNormalPriority, _, kSeqNum, _, _, _)).
                   WillOnce(testing::Return(false));
 
   rtp_sender_->SetStorePacketsStatus(true, 10);
@@ -425,7 +425,7 @@ TEST_F(RtpSenderTest, TrafficSmoothingRetransmits) {
   EXPECT_EQ(0, transport_.packets_sent_);
 
   EXPECT_CALL(mock_paced_sender_,
-              SendPacket(PacedSender::kHighPriority, _, kSeqNum, _, _)).
+              SendPacket(PacedSender::kHighPriority, _, kSeqNum, _, _, _)).
                   WillOnce(testing::Return(false));
 
   const int kStoredTimeInMs = 100;
@@ -434,7 +434,7 @@ TEST_F(RtpSenderTest, TrafficSmoothingRetransmits) {
   EXPECT_EQ(rtp_length, rtp_sender_->ReSendPacket(kSeqNum));
   EXPECT_EQ(0, transport_.packets_sent_);
 
-  rtp_sender_->TimeToSendPacket(kSeqNum, capture_time_ms);
+  rtp_sender_->TimeToSendPacket(kSeqNum, capture_time_ms, false);
 
   // Process send bucket. Packet should now be sent.
   EXPECT_EQ(1, transport_.packets_sent_);
diff --git a/webrtc/video_engine/vie_encoder.cc b/webrtc/video_engine/vie_encoder.cc
index 5bddda47c5..889842e129 100644
--- a/webrtc/video_engine/vie_encoder.cc
+++ b/webrtc/video_engine/vie_encoder.cc
@@ -118,8 +118,9 @@ class ViEPacedSenderCallback : public PacedSender::Callback {
   }
   virtual ~ViEPacedSenderCallback() {}
   virtual bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                int64_t capture_time_ms) {
-    return owner_->TimeToSendPacket(ssrc, sequence_number, capture_time_ms);
+                                int64_t capture_time_ms, bool retransmission) {
+    return owner_->TimeToSendPacket(ssrc, sequence_number, capture_time_ms,
+                                    retransmission);
   }
   virtual int TimeToSendPadding(int bytes) {
     return owner_->TimeToSendPadding(bytes);
@@ -515,10 +516,12 @@ int32_t ViEEncoder::ScaleInputImage(bool enable) {
   return 0;
 }
 
-bool ViEEncoder::TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                  int64_t capture_time_ms) {
+bool ViEEncoder::TimeToSendPacket(uint32_t ssrc,
+                                  uint16_t sequence_number,
+                                  int64_t capture_time_ms,
+                                  bool retransmission) {
   return default_rtp_rtcp_->TimeToSendPacket(ssrc, sequence_number,
-                                             capture_time_ms);
+                                             capture_time_ms, retransmission);
 }
 
 int ViEEncoder::TimeToSendPadding(int bytes) {
diff --git a/webrtc/video_engine/vie_encoder.h b/webrtc/video_engine/vie_encoder.h
index 7177f8ff62..f80699cc66 100644
--- a/webrtc/video_engine/vie_encoder.h
+++ b/webrtc/video_engine/vie_encoder.h
@@ -181,7 +181,7 @@ class ViEEncoder
 
   // Called by PacedSender.
   bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                        int64_t capture_time_ms);
+                        int64_t capture_time_ms, bool retransmission);
   int TimeToSendPadding(int bytes);
  private:
   bool EncoderPaused() const;