Bug 813190 - Stop media streams from hanging onto the last played media frame indefinitely. r=roc

content/media/MediaStreamGraph.cpp

@@ -833,6 +833,7 @@ MediaStreamGraphImpl::UpdateCurrentTime()
     if (stream->mFinished && !stream->mNotifiedFinished &&
         stream->mBufferStartTime + stream->GetBufferEnd() <= nextCurrentTime) {
       stream->mNotifiedFinished = true;
+      stream->mLastPlayedVideoFrame.SetNull();
       for (uint32_t j = 0; j < stream->mListeners.Length(); ++j) {
         MediaStreamListener* l = stream->mListeners[j];
         l->NotifyFinished(this);
@@ -1296,7 +1297,9 @@ MediaStreamGraphImpl::PlayVideo(MediaStream* aStream)
       NS_NewRunnableMethod(output, &VideoFrameContainer::Invalidate);
     NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
   }
-  aStream->mLastPlayedVideoFrame = *frame;
+  if (!aStream->mNotifiedFinished) {
+    aStream->mLastPlayedVideoFrame = *frame;
+  }
 }
 
 void