diff --git a/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.cc b/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.cc
index 9af20898fd..5fa60dc993 100644
--- a/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.cc
+++ b/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.cc
@@ -60,8 +60,12 @@ std::unique_ptr<NetEqInput::PacketData> NetEqPacketSourceInput::PopPacket() {
   return packet_data;
 }
 
-NetEqRtpDumpInput::NetEqRtpDumpInput(const std::string& file_name)
+NetEqRtpDumpInput::NetEqRtpDumpInput(const std::string& file_name,
+                                     const RtpHeaderExtensionMap& hdr_ext_map)
     : source_(RtpFileSource::Create(file_name)) {
+  for (const auto& ext_pair : hdr_ext_map) {
+    source_->RegisterRtpHeaderExtension(ext_pair.second, ext_pair.first);
+  }
   LoadNextPacket();
 }
 
@@ -82,8 +86,12 @@ PacketSource* NetEqRtpDumpInput::source() {
   return source_.get();
 }
 
-NetEqEventLogInput::NetEqEventLogInput(const std::string& file_name)
+NetEqEventLogInput::NetEqEventLogInput(const std::string& file_name,
+                                       const RtpHeaderExtensionMap& hdr_ext_map)
     : source_(RtcEventLogSource::Create(file_name)) {
+  for (const auto& ext_pair : hdr_ext_map) {
+    source_->RegisterRtpHeaderExtension(ext_pair.second, ext_pair.first);
+  }
   LoadNextPacket();
   AdvanceOutputEvent();
 }
diff --git a/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.h b/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.h
index 4e350a6799..35b54fa41f 100644
--- a/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.h
+++ b/webrtc/modules/audio_coding/neteq/tools/neteq_packet_source_input.h
@@ -11,9 +11,11 @@
 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_PACKET_SOURCE_INPUT_H_
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_PACKET_SOURCE_INPUT_H_
 
+#include <map>
 #include <string>
 
 #include "webrtc/modules/audio_coding/neteq/tools/neteq_input.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 
 namespace webrtc {
 namespace test {
@@ -24,6 +26,8 @@ class RtcEventLogSource;
 // An adapter class to dress up a PacketSource object as a NetEqInput.
 class NetEqPacketSourceInput : public NetEqInput {
  public:
+  using RtpHeaderExtensionMap = std::map<int, webrtc::RTPExtensionType>;
+
   NetEqPacketSourceInput();
   rtc::Optional<int64_t> NextPacketTime() const override;
   std::unique_ptr<PacketData> PopPacket() override;
@@ -43,7 +47,8 @@ class NetEqPacketSourceInput : public NetEqInput {
 // Implementation of NetEqPacketSourceInput to be used with an RtpFileSource.
 class NetEqRtpDumpInput final : public NetEqPacketSourceInput {
  public:
-  explicit NetEqRtpDumpInput(const std::string& file_name);
+  NetEqRtpDumpInput(const std::string& file_name,
+                    const RtpHeaderExtensionMap& hdr_ext_map);
 
   rtc::Optional<int64_t> NextOutputEventTime() const override;
   void AdvanceOutputEvent() override;
@@ -61,7 +66,8 @@ class NetEqRtpDumpInput final : public NetEqPacketSourceInput {
 // RtcEventLogSource.
 class NetEqEventLogInput final : public NetEqPacketSourceInput {
  public:
-  explicit NetEqEventLogInput(const std::string& file_name);
+  NetEqEventLogInput(const std::string& file_name,
+                     const RtpHeaderExtensionMap& hdr_ext_map);
 
   rtc::Optional<int64_t> NextOutputEventTime() const override;
   void AdvanceOutputEvent() override;
diff --git a/webrtc/modules/audio_coding/neteq/tools/neteq_rtpplay.cc b/webrtc/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
index 9e3119b246..ff4b68bfb5 100644
--- a/webrtc/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
+++ b/webrtc/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
@@ -74,6 +74,13 @@ bool ValidateSsrcValue(const char* flagname, const std::string& str) {
   return ParseSsrc(str, &dummy_ssrc);
 }
 
+static bool ValidateExtensionId(const char* flagname, int32_t value) {
+  if (value > 0 && value <= 255)  // Value is ok.
+    return true;
+  printf("Invalid value for --%s: %d\n", flagname, static_cast<int>(value));
+  return false;
+}
+
 // Define command line flags.
 DEFINE_int32(pcmu, 0, "RTP payload type for PCM-u");
 const bool pcmu_dummy =
@@ -136,6 +143,12 @@ DEFINE_string(ssrc,
               "starting with 0x)");
 const bool hex_ssrc_dummy =
     google::RegisterFlagValidator(&FLAGS_ssrc, &ValidateSsrcValue);
+DEFINE_int32(audio_level, 1, "Extension ID for audio level (RFC 6464)");
+const bool audio_level_dummy =
+    google::RegisterFlagValidator(&FLAGS_audio_level, &ValidateExtensionId);
+DEFINE_int32(abs_send_time, 3, "Extension ID for absolute sender time");
+const bool abs_send_time_dummy =
+    google::RegisterFlagValidator(&FLAGS_abs_send_time, &ValidateExtensionId);
 
 // Maps a codec type to a printable name string.
 std::string CodecName(NetEqDecoder codec) {
@@ -297,13 +310,18 @@ int RunTest(int argc, char* argv[]) {
     return 0;
   }
 
+  // Gather RTP header extensions in a map.
+  NetEqPacketSourceInput::RtpHeaderExtensionMap rtp_ext_map = {
+      {FLAGS_audio_level, kRtpExtensionAudioLevel},
+      {FLAGS_abs_send_time, kRtpExtensionAbsoluteSendTime}};
+
   const std::string input_file_name = argv[1];
   std::unique_ptr<NetEqInput> input;
   if (RtpFileSource::ValidRtpDump(input_file_name) ||
       RtpFileSource::ValidPcap(input_file_name)) {
-    input.reset(new NetEqRtpDumpInput(input_file_name));
+    input.reset(new NetEqRtpDumpInput(input_file_name, rtp_ext_map));
   } else {
-    input.reset(new NetEqEventLogInput(input_file_name));
+    input.reset(new NetEqEventLogInput(input_file_name, rtp_ext_map));
   }
 
   std::cout << "Input file: " << input_file_name << std::endl;