--- a/dom/media/MediaDecoderReader.h
+++ b/dom/media/MediaDecoderReader.h
@@ -295,19 +295,16 @@ protected:
   AbstractMediaDecoder* mDecoder;
 
   // Decode task queue.
   RefPtr<TaskQueue> mTaskQueue;
 
   // Buffered range.
   Canonical<media::TimeIntervals> mBuffered;
 
-  // Stores presentation info required for playback.
-  MediaInfo mInfo;
-
   media::NullableTimeUnit mDuration;
 
   bool mShutdown;
 
   // Used to send TimedMetadata to the listener.
   TimedMetadataEventProducer mTimedMetadataEvent;
 
   // Notify if this media is not seekable.

--- a/dom/media/MediaFormatReader.h
+++ b/dom/media/MediaFormatReader.h
@@ -549,16 +549,19 @@ private:
 
   void OnFirstDemuxCompleted(TrackInfo::TrackType aType,
                              RefPtr<MediaTrackDemuxer::SamplesHolder> aSamples);
 
   void OnFirstDemuxFailed(TrackInfo::TrackType aType, const MediaResult& aError);
 
   void MaybeResolveMetadataPromise();
 
+  // Stores presentation info required for playback.
+  MediaInfo mInfo;
+
   UniquePtr<MetadataTags> mTags;
 
   // A flag indicating if the start time is known or not.
   bool mHasStartTime = false;
 
   void ShutdownDecoder(TrackType aTrack);
   RefPtr<ShutdownPromise> TearDownDecoders();
 };