--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -3517,28 +3517,35 @@ MediaFormatReader::GetMozDebugReaderData
   nsAutoCString audioType("none");
   nsAutoCString videoType("none");
 
   if (HasAudio()) {
     MutexAutoLock lock(mAudio.mMutex);
     audioDecoderName = mAudio.mDecoder
                        ? mAudio.mDecoder->GetDescriptionName()
                        : mAudio.mDescription;
-    audioType = mInfo.mAudio.mMimeType;
+    audioType = mAudio.mInfo ? mAudio.mInfo->mMimeType : mInfo.mAudio.mMimeType;
   }
   if (HasVideo()) {
     MutexAutoLock mon(mVideo.mMutex);
     videoDecoderName = mVideo.mDecoder
                        ? mVideo.mDecoder->GetDescriptionName()
                        : mVideo.mDescription;
-    videoType = mInfo.mVideo.mMimeType;
+    videoType = mVideo.mInfo ? mVideo.mInfo->mMimeType : mInfo.mVideo.mMimeType;
   }
 
-  result += nsPrintfCString(
-    "Audio Decoder(%s): %s\n", audioType.get(), audioDecoderName.get());
+  result +=
+    nsPrintfCString("Audio Decoder(%s, %u channels @ %0.1fkHz): %s\n",
+                    audioType.get(),
+                    mAudio.mInfo ? mAudio.mInfo->GetAsAudioInfo()->mChannels
+                                 : mInfo.mAudio.mChannels,
+                    (mAudio.mInfo ? mAudio.mInfo->GetAsAudioInfo()->mRate
+                                  : mInfo.mAudio.mRate) /
+                      1000.0f,
+                    audioDecoderName.get());
   result += nsPrintfCString("Audio Frames Decoded: %" PRIu64 "\n",
                             mAudio.mNumSamplesOutputTotal);
   if (HasAudio()) {
     result += nsPrintfCString(
       "Audio State: ni=%d no=%d wp=%d demuxr=%d demuxq=%u decoder=%d tt=%.1f "
       "tths=%d in=%" PRIu64 " out=%" PRIu64
       " qs=%u pending=%u wfd=%d eos=%d ds=%d wfk=%d sid=%u\n",
       NeedInput(mAudio),