--- a/content/media/AudioSink.cpp
+++ b/content/media/AudioSink.cpp
@@ -298,17 +298,23 @@ AudioSink::PlayFromAudioQueue()
     ReentrantMonitorAutoEnter mon(GetReentrantMonitor());
     NS_WARN_IF_FALSE(mPlaying, "Should be playing");
     // Awaken the decode loop if it's waiting for space to free up in the
     // audio queue.
     GetReentrantMonitor().NotifyAll();
   }
   SINK_LOG_V("playing %u frames of audio at time %lld",
              audio->mFrames, audio->mTime);
-  mAudioStream->Write(audio->mAudioData, audio->mFrames);
+  if (audio->mRate == mInfo.mRate && audio->mChannels == mInfo.mChannels) {
+    mAudioStream->Write(audio->mAudioData, audio->mFrames);
+  } else {
+    SINK_LOG_V("mismatched sample format mInfo=[%uHz/%u channels] audio=[%uHz/%u channels]",
+               mInfo.mRate, mInfo.mChannels, audio->mRate, audio->mChannels);
+    PlaySilence(audio->mFrames);
+  }
 
   StartAudioStreamPlaybackIfNeeded();
 
   if (audio->mOffset != -1) {
     mStateMachine->OnPlaybackOffsetUpdate(audio->mOffset);
   }
   return audio->mFrames;
 }