--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -963,22 +963,16 @@ public:
     // in the middle of seeking and won't have a valid video frame to show
     // when seek is done.
     if (mMaster->mVideoDecodeSuspended) {
       mMaster->mVideoDecodeSuspended = false;
       mMaster->mOnPlaybackEvent.Notify(MediaEventType::ExitVideoSuspend);
       Reader()->SetVideoBlankDecode(false);
     }
 
-    // Dispatch a mozvideoonlyseekbegin event to indicate UI for corresponding
-    // changes.
-    if (mSeekJob.mTarget->IsVideoOnly()) {
-      mMaster->mOnPlaybackEvent.Notify(MediaEventType::VideoOnlySeekBegin);
-    }
-
     // Suppressed visibility comes from two cases: (1) leaving dormant state,
     // and (2) resuming suspended video decoder. We want both cases to be
     // transparent to the user. So we only notify the change when the seek
     // request is from the user.
     if (mVisibility == EventVisibility::Observable) {
       // Don't stop playback for a video-only seek since we want to keep playing
       // audio and we don't need to stop playback while leaving dormant for the
       // playback should has been stopped.
@@ -1768,16 +1762,33 @@ private:
   }
 };
 
 class MediaDecoderStateMachine::VideoOnlySeekingState
   : public MediaDecoderStateMachine::AccurateSeekingState
 {
 public:
   explicit VideoOnlySeekingState(Master* aPtr) : AccurateSeekingState(aPtr) { }
+
+  RefPtr<MediaDecoder::SeekPromise> Enter(SeekJob&& aSeekJob,
+                                          EventVisibility aVisibility)
+  {
+    MOZ_ASSERT(aSeekJob.mTarget->IsVideoOnly());
+    MOZ_ASSERT(aVisibility == EventVisibility::Suppressed);
+
+    RefPtr<MediaDecoder::SeekPromise> p =
+      AccurateSeekingState::Enter(Move(aSeekJob), aVisibility);
+
+    // Dispatch a mozvideoonlyseekbegin event to indicate UI for corresponding
+    // changes.
+    mMaster->mOnPlaybackEvent.Notify(MediaEventType::VideoOnlySeekBegin);
+
+    return p.forget();
+  }
+
 };
 
 RefPtr<MediaDecoder::SeekPromise>
 MediaDecoderStateMachine::DormantState::HandleSeek(SeekTarget aTarget)
 {
   if (aTarget.IsNextFrame()) {
     // NextFrameSeekingState doesn't reset the decoder unlike
     // AccurateSeekingState. So we first must come out of dormant by seeking to