--- a/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
+++ b/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
@@ -118,17 +118,18 @@ WMFMediaDataDecoder::ProcessDecode(Media
   if (mIsFlushing) {
     // Skip sample, to be released by runnable.
     return;
   }
 
   HRESULT hr = mMFTManager->Input(aSample);
   if (FAILED(hr)) {
     NS_WARNING("MFTManager rejected sample");
-    mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR, __func__));
+    mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                                 RESULT_DETAIL("MFTManager::Input:%x", hr)));
     if (!mRecordedError) {
       SendTelemetry(hr);
       mRecordedError = true;
     }
     return;
   }
 
   mLastStreamOffset = aSample->mOffset;
@@ -145,17 +146,18 @@ WMFMediaDataDecoder::ProcessOutput()
          output) {
     mHasSuccessfulOutput = true;
     mCallback->Output(output);
   }
   if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT) {
     mCallback->InputExhausted();
   } else if (FAILED(hr)) {
     NS_WARNING("WMFMediaDataDecoder failed to output data");
-    mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR, __func__));
+    mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                                 RESULT_DETAIL("MFTManager::Output:%x", hr)));
     if (!mRecordedError) {
       SendTelemetry(hr);
       mRecordedError = true;
     }
   }
 }
 
 void