1 files changed, 9 insertions, 3 deletions
diff --git a/dom/media/webrtc/jsep/JsepSessionImpl.cpp b/dom/media/webrtc/jsep/JsepSessionImpl.cpp
index 50def6eb6c..c091b6d618 100644
--- a/dom/media/webrtc/jsep/JsepSessionImpl.cpp
+++ b/dom/media/webrtc/jsep/JsepSessionImpl.cpp
@@ -1121,11 +1121,17 @@ nsresult JsepSessionImpl::HandleNegotiatedSession(
 
   CopyBundleTransports();
 
-  std::vector<JsepTrack*> remoteTracks;
+  std::vector<JsepTrack*> receiveTracks;
   for (auto& transceiver : mTransceivers) {
-    remoteTracks.push_back(&transceiver.mRecvTrack);
+    // Do not count payload types for non-active recv tracks as duplicates. If
+    // we receive an RTP packet with a payload type that is used by both a
+    // sendrecv and a sendonly m-section, there is no ambiguity; it is for the
+    // sendrecv m-section.
+    if (transceiver.mRecvTrack.GetActive()) {
+      receiveTracks.push_back(&transceiver.mRecvTrack);
+    }
   }
-  JsepTrack::SetUniquePayloadTypes(remoteTracks);
+  JsepTrack::SetUniqueReceivePayloadTypes(receiveTracks);
 
   mNegotiations++;