diff --git a/api/frame_transformer_interface.h b/api/frame_transformer_interface.h
index ab56f04..ca3a15a 100644
--- a/api/frame_transformer_interface.h
+++ b/api/frame_transformer_interface.h
@@ -33,8 +33,11 @@
   // Copies `data` into the owned frame payload data.
   virtual void SetData(rtc::ArrayView<const uint8_t> data) = 0;
 
-  virtual uint32_t GetTimestamp() const = 0;
+  // TODO(bugs.webrtc.org/13077) make pure virtual again after rolling into
+  // Chrome.
+  virtual uint8_t GetPayloadType() const { return 255; }
   virtual uint32_t GetSsrc() const = 0;
+  virtual uint32_t GetTimestamp() const = 0;
 };
 
 class TransformableVideoFrameInterface : public TransformableFrameInterface {
diff --git a/audio/channel_receive_frame_transformer_delegate.cc b/audio/channel_receive_frame_transformer_delegate.cc
index 7e617df..101fd3f 100644
--- a/audio/channel_receive_frame_transformer_delegate.cc
+++ b/audio/channel_receive_frame_transformer_delegate.cc
@@ -33,8 +33,9 @@
     payload_.SetData(data.data(), data.size());
   }
 
-  uint32_t GetTimestamp() const override { return header_.timestamp; }
+  uint8_t GetPayloadType() const override { return header_.payloadType; }
   uint32_t GetSsrc() const override { return ssrc_; }
+  uint32_t GetTimestamp() const override { return header_.timestamp; }
   const RTPHeader& GetHeader() const override { return header_; }
 
  private:
diff --git a/audio/channel_send_frame_transformer_delegate.cc b/audio/channel_send_frame_transformer_delegate.cc
index 72a459d..e71460e 100644
--- a/audio/channel_send_frame_transformer_delegate.cc
+++ b/audio/channel_send_frame_transformer_delegate.cc
@@ -44,7 +44,7 @@
   uint32_t GetSsrc() const override { return ssrc_; }
 
   AudioFrameType GetFrameType() const { return frame_type_; }
-  uint8_t GetPayloadType() const { return payload_type_; }
+  uint8_t GetPayloadType() const override { return payload_type_; }
   int64_t GetAbsoluteCaptureTimestampMs() const {
     return absolute_capture_timestamp_ms_;
   }
diff --git a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.cc b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.cc
index 23e66bf..e08479a 100644
--- a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.cc
+++ b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.cc
@@ -40,7 +40,10 @@
         timestamp_(rtp_timestamp),
         capture_time_ms_(encoded_image.capture_time_ms_),
         expected_retransmission_time_ms_(expected_retransmission_time_ms),
-        ssrc_(ssrc) {}
+        ssrc_(ssrc) {
+    RTC_DCHECK_GE(payload_type_, 0);
+    RTC_DCHECK_LE(payload_type_, 127);
+  }
 
   ~TransformableVideoSenderFrame() override = default;
 
@@ -67,7 +70,7 @@
   const VideoFrameMetadata& GetMetadata() const override { return metadata_; }
 
   const RTPVideoHeader& GetHeader() const { return header_; }
-  int GetPayloadType() const { return payload_type_; }
+  uint8_t GetPayloadType() const override { return payload_type_; }
   absl::optional<VideoCodecType> GetCodecType() const { return codec_type_; }
   int64_t GetCaptureTimeMs() const { return capture_time_ms_; }
 
@@ -80,7 +83,7 @@
   const RTPVideoHeader header_;
   const VideoFrameMetadata metadata_;
   const VideoFrameType frame_type_;
-  const int payload_type_;
+  const uint8_t payload_type_;
   const absl::optional<VideoCodecType> codec_type_ = absl::nullopt;
   const uint32_t timestamp_;
   const int64_t capture_time_ms_;
diff --git a/modules/rtp_rtcp/source/rtp_sender_video_unittest.cc b/modules/rtp_rtcp/source/rtp_sender_video_unittest.cc
index 6f1c038..3e803ff 100644
--- a/modules/rtp_rtcp/source/rtp_sender_video_unittest.cc
+++ b/modules/rtp_rtcp/source/rtp_sender_video_unittest.cc
@@ -1348,6 +1348,32 @@
                                      kDefaultExpectedRetransmissionTimeMs);
 }
 
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+TEST_F(RtpSenderVideoWithFrameTransformerTest, ValidPayloadTypes) {
+  rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
+      new rtc::RefCountedObject<NiceMock<MockFrameTransformer>>();
+  std::unique_ptr<RTPSenderVideo> rtp_sender_video =
+      CreateSenderWithFrameTransformer(mock_frame_transformer);
+  auto encoded_image = CreateDefaultEncodedImage();
+  RTPVideoHeader video_header;
+
+  EXPECT_TRUE(rtp_sender_video->SendEncodedImage(
+      0, kType, kTimestamp, *encoded_image, video_header,
+      kDefaultExpectedRetransmissionTimeMs));
+  EXPECT_TRUE(rtp_sender_video->SendEncodedImage(
+      127, kType, kTimestamp, *encoded_image, video_header,
+      kDefaultExpectedRetransmissionTimeMs));
+  EXPECT_DEATH(rtp_sender_video->SendEncodedImage(
+                   -1, kType, kTimestamp, *encoded_image, video_header,
+                   kDefaultExpectedRetransmissionTimeMs),
+               "");
+  EXPECT_DEATH(rtp_sender_video->SendEncodedImage(
+                   128, kType, kTimestamp, *encoded_image, video_header,
+                   kDefaultExpectedRetransmissionTimeMs),
+               "");
+}
+#endif
+
 TEST_F(RtpSenderVideoWithFrameTransformerTest, OnTransformedFrameSendsVideo) {
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       new rtc::RefCountedObject<NiceMock<MockFrameTransformer>>();
diff --git a/test/mock_transformable_frame.h b/test/mock_transformable_frame.h
index 13764f5..039013f 100644
--- a/test/mock_transformable_frame.h
+++ b/test/mock_transformable_frame.h
@@ -20,8 +20,9 @@
  public:
   MOCK_METHOD(rtc::ArrayView<const uint8_t>, GetData, (), (const, override));
   MOCK_METHOD(void, SetData, (rtc::ArrayView<const uint8_t>), (override));
-  MOCK_METHOD(uint32_t, GetTimestamp, (), (const, override));
+  MOCK_METHOD(uint8_t, GetPayloadType, (), (const, override));
   MOCK_METHOD(uint32_t, GetSsrc, (), (const, override));
+  MOCK_METHOD(uint32_t, GetTimestamp, (), (const, override));
 };
 
 }  // namespace webrtc
diff --git a/video/rtp_video_stream_receiver_frame_transformer_delegate.cc b/video/rtp_video_stream_receiver_frame_transformer_delegate.cc
index f2f81df..c906981 100644
--- a/video/rtp_video_stream_receiver_frame_transformer_delegate.cc
+++ b/video/rtp_video_stream_receiver_frame_transformer_delegate.cc
@@ -41,8 +41,9 @@
         EncodedImageBuffer::Create(data.data(), data.size()));
   }
 
-  uint32_t GetTimestamp() const override { return frame_->Timestamp(); }
+  uint8_t GetPayloadType() const override { return frame_->PayloadType(); }
   uint32_t GetSsrc() const override { return ssrc_; }
+  uint32_t GetTimestamp() const override { return frame_->Timestamp(); }
 
   bool IsKeyFrame() const override {
     return frame_->FrameType() == VideoFrameType::kVideoFrameKey;