--- a/dom/media/VideoFrameConverter.h
+++ b/dom/media/VideoFrameConverter.h
@@ -140,19 +140,18 @@ class VideoFrameConverter {
                    aTrackEnabled ? "enabled" : "disabled"));
           mTrackEnabled = aTrackEnabled;
           if (!aTrackEnabled) {
             // After disabling we immediately send a frame as black, so it can
             // be seen quickly, even if no frames are flowing.
             if (mLastFrameQueuedForProcessing.Serial() != -2) {
               // This track has already seen a frame so we re-send the last one
               // queued as black.
-              FrameToProcess f = mLastFrameQueuedForProcessing;
-              f.mTime = TimeStamp::Now();
-              ProcessVideoFrame(f);
+              QueueForProcessing(nullptr, TimeStamp::Now(),
+                                 mLastFrameQueuedForProcessing.mSize, true);
             } else {
               // This track has not yet seen any frame. We make one up.
               QueueForProcessing(nullptr, TimeStamp::Now(),
                                  gfx::IntSize(640, 480), true);
             }
           }
         }));
     MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));