diff --git a/pc/channel.cc b/pc/channel.cc
index caf8c93956..916c403a00 100644
--- a/pc/channel.cc
+++ b/pc/channel.cc
@@ -94,6 +94,20 @@ static void SafeSetError(const std::string& message, std::string* error_desc) {
   }
 }
 
+template <class Codec>
+std::vector<Codec> SanitizeCodecList(const std::vector<Codec>& codecs) {
+  std::vector<Codec> sanitized;
+  for (const Codec& codec : codecs) {
+    if (absl::c_any_of(sanitized, [&](const Codec& other) {
+          return codec.Matches(other);
+        })) {
+      continue;
+    }
+    sanitized.push_back(codec);
+  }
+  return sanitized;
+}
+
 template <class Codec>
 void RtpParametersFromMediaDescription(
     const MediaContentDescriptionImpl<Codec>* desc,
@@ -103,7 +117,7 @@ void RtpParametersFromMediaDescription(
   // a description without codecs. Currently the ORTC implementation is relying
   // on this.
   if (desc->has_codecs()) {
-    params->codecs = desc->codecs();
+    params->codecs = SanitizeCodecList(desc->codecs());
   }
   // TODO(pthatcher): See if we really need
   // rtp_header_extensions_set() and remove it if we don't.
diff --git a/pc/channel_unittest.cc b/pc/channel_unittest.cc
index db0e8a8d02..952570e1c2 100644
--- a/pc/channel_unittest.cc
+++ b/pc/channel_unittest.cc
@@ -45,6 +45,7 @@ using cricket::FakeVoiceMediaChannel;
 using cricket::RidDescription;
 using cricket::RidDirection;
 using cricket::StreamParams;
+using testing::ElementsAre;
 using webrtc::RtpTransceiverDirection;
 using webrtc::SdpType;
 
@@ -2268,6 +2269,27 @@ TEST_F(VideoChannelSingleThreadTest,
   EXPECT_EQ(media_channel1_->send_codecs()[0].packetization, absl::nullopt);
 }
 
+// Test that if the session description has the same codec assigned to two
+// payload types then the MediaChannel will only receive the one that comes
+// first in the list.
+TEST_F(VideoChannelSingleThreadTest, TestFilterDuplicateDynamicCodecs) {
+  const char kCodecName[] = "VP8";
+  cricket::VideoCodec codec(98, kCodecName);
+  cricket::VideoCodec duplicate(99, kCodecName);
+  cricket::VideoContentDescription video_content;
+  video_content.set_codecs({codec, duplicate});
+
+  CreateChannels(0, 0);
+
+  EXPECT_TRUE(
+      channel1_->SetRemoteContent(&video_content, SdpType::kOffer, NULL));
+  EXPECT_TRUE(
+      channel1_->SetLocalContent(&video_content, SdpType::kAnswer, NULL));
+
+  EXPECT_THAT(media_channel1_->recv_codecs(), ElementsAre(codec));
+  EXPECT_THAT(media_channel1_->send_codecs(), ElementsAre(codec));
+}
+
 // VideoChannelDoubleThreadTest
 TEST_F(VideoChannelDoubleThreadTest, TestInit) {
   Base::TestInit();