--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -980,19 +980,24 @@ MediaDecoder::IsShutdown() const
 
 void
 MediaDecoder::PlaybackEnded()
 {
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
 
   if (mLogicallySeeking || mPlayState == PLAY_STATE_LOADING) {
+    DECODER_LOG("MediaDecoder::PlaybackEnded bailed out, "
+                "mLogicallySeeking=%d mPlayState=%s",
+                mLogicallySeeking.Ref(), ToPlayStateStr(mPlayState));
     return;
   }
 
+  DECODER_LOG("MediaDecoder::PlaybackEnded");
+
   ChangeState(PLAY_STATE_ENDED);
   InvalidateWithFlags(VideoFrameContainer::INVALIDATE_FORCE);
   mOwner->PlaybackEnded();
 
   // This must be called after |mOwner->PlaybackEnded()| call above, in order
   // to fire the required durationchange.
   if (IsInfinite()) {
     SetInfinite(false);