diff --git a/modules/rtp_rtcp/source/rtp_sender_video.cc b/modules/rtp_rtcp/source/rtp_sender_video.cc
index f29c5ead0f..f4d30ebb9f 100644
--- a/modules/rtp_rtcp/source/rtp_sender_video.cc
+++ b/modules/rtp_rtcp/source/rtp_sender_video.cc
@@ -158,7 +158,6 @@ RTPSenderVideo::RTPSenderVideo(const Config& config)
                     this,
                     config.frame_transformer,
                     rtp_sender_->SSRC(),
-                    rtp_sender_->Csrcs(),
                     config.task_queue_factory)
               : nullptr) {
   if (frame_transformer_delegate_)
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 140d6419d4..2281a2ae27 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
@@ -119,12 +119,10 @@ RTPSenderVideoFrameTransformerDelegate::RTPSenderVideoFrameTransformerDelegate(
     RTPVideoFrameSenderInterface* sender,
     rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
     uint32_t ssrc,
-    std::vector<uint32_t> csrcs,
     TaskQueueFactory* task_queue_factory)
     : sender_(sender),
       frame_transformer_(std::move(frame_transformer)),
       ssrc_(ssrc),
-      csrcs_(csrcs),
       transformation_queue_(task_queue_factory->CreateTaskQueue(
           "video_frame_transformer",
           TaskQueueFactory::Priority::NORMAL)) {}
@@ -143,7 +141,8 @@ bool RTPSenderVideoFrameTransformerDelegate::TransformFrame(
     TimeDelta expected_retransmission_time) {
   frame_transformer_->Transform(std::make_unique<TransformableVideoSenderFrame>(
       encoded_image, video_header, payload_type, codec_type, rtp_timestamp,
-      expected_retransmission_time, ssrc_, csrcs_));
+      expected_retransmission_time, ssrc_,
+      /*csrcs=*/std::vector<uint32_t>()));
   return true;
 }
 
diff --git a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.h b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.h
index 8b32b8d7c8..a333db235a 100644
--- a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.h
+++ b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate.h
@@ -58,7 +58,6 @@ class RTPSenderVideoFrameTransformerDelegate : public TransformedFrameCallback {
       RTPVideoFrameSenderInterface* sender,
       rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
       uint32_t ssrc,
-      std::vector<uint32_t> csrcs,
       TaskQueueFactory* send_transport_queue);
 
   void Init();
@@ -105,7 +104,6 @@ class RTPSenderVideoFrameTransformerDelegate : public TransformedFrameCallback {
   RTPVideoFrameSenderInterface* sender_ RTC_GUARDED_BY(sender_lock_);
   rtc::scoped_refptr<FrameTransformerInterface> frame_transformer_;
   const uint32_t ssrc_;
-  std::vector<uint32_t> csrcs_;
   // Used when the encoded frames arrives without a current task queue. This can
   // happen if a hardware encoder was used.
   std::unique_ptr<TaskQueueBase, TaskQueueDeleter> transformation_queue_;
diff --git a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate_unittest.cc b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate_unittest.cc
index 03fc922e3a..54cfdbadd7 100644
--- a/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate_unittest.cc
+++ b/modules/rtp_rtcp/source/rtp_sender_video_frame_transformer_delegate_unittest.cc
@@ -90,8 +90,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
        RegisterTransformedFrameCallbackSinkOnInit) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
   EXPECT_CALL(*frame_transformer_,
               RegisterTransformedFrameSinkCallback(_, 1111));
   delegate->Init();
@@ -101,8 +100,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
        UnregisterTransformedFrameSinkCallbackOnReset) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
   EXPECT_CALL(*frame_transformer_,
               UnregisterTransformedFrameSinkCallback(1111));
   delegate->Reset();
@@ -112,8 +110,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
        TransformFrameCallsTransform) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   EncodedImage encoded_image;
   EXPECT_CALL(*frame_transformer_, Transform);
@@ -127,8 +124,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
        OnTransformedFrameCallsSenderSendVideo) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   rtc::scoped_refptr<TransformedFrameCallback> callback;
   EXPECT_CALL(*frame_transformer_, RegisterTransformedFrameSinkCallback)
@@ -154,8 +150,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
 TEST_F(RtpSenderVideoFrameTransformerDelegateTest, CloneSenderVideoFrame) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   std::unique_ptr<TransformableFrameInterface> frame =
       GetTransformableFrame(delegate);
@@ -175,8 +170,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest, CloneSenderVideoFrame) {
 TEST_F(RtpSenderVideoFrameTransformerDelegateTest, CloneKeyFrame) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   std::unique_ptr<TransformableFrameInterface> frame =
       GetTransformableFrame(delegate, /*key_frame=*/true);
@@ -196,8 +190,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest, CloneKeyFrame) {
 TEST_F(RtpSenderVideoFrameTransformerDelegateTest, MetadataAfterSetMetadata) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   std::unique_ptr<TransformableFrameInterface> frame =
       GetTransformableFrame(delegate);
@@ -225,8 +218,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
        ReceiverFrameConvertedToSenderFrame) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   const uint8_t payload_type = 1;
   const uint32_t timestamp = 2;
@@ -274,8 +266,7 @@ TEST_F(RtpSenderVideoFrameTransformerDelegateTest,
 TEST_F(RtpSenderVideoFrameTransformerDelegateTest, SettingRTPTimestamp) {
   auto delegate = rtc::make_ref_counted<RTPSenderVideoFrameTransformerDelegate>(
       &test_sender_, frame_transformer_,
-      /*ssrc=*/1111, /*csrcs=*/std::vector<uint32_t>(),
-      time_controller_.CreateTaskQueueFactory().get());
+      /*ssrc=*/1111, time_controller_.CreateTaskQueueFactory().get());
 
   std::unique_ptr<TransformableFrameInterface> frame =
       GetTransformableFrame(delegate);