diff --git a/jp.iridescent.cameraliveproduction/Script/CameraMixerTimeline/CameraMixerTimelineMixerBehaviour.cs b/jp.iridescent.cameraliveproduction/Script/CameraMixerTimeline/CameraMixerTimelineMixerBehaviour.cs
index 623e6b2..5378f5d 100644
--- a/jp.iridescent.cameraliveproduction/Script/CameraMixerTimeline/CameraMixerTimelineMixerBehaviour.cs
+++ b/jp.iridescent.cameraliveproduction/Script/CameraMixerTimeline/CameraMixerTimelineMixerBehaviour.cs
@@ -39,6 +39,9 @@ public class CameraMixerTimelineMixerBehaviour : PlayableBehaviour
         internal PlayableDirector director;
         internal CameraMixerTimelineTrack track;
         private bool isFirstFrameHappened = false;
+        
+        private HashSet<CameraPostProductionBase> postProductionSet = new();
+
         // NOTE: This function is called at runtime and edit time.  Keep that in mind when setting the values of properties.
         public override void ProcessFrame(Playable playable, FrameData info, object playerData)
         {
@@ -78,7 +81,6 @@ public override void ProcessFrame(Playable playable, FrameData info, object play
                 ScriptPlayable<CameraMixerTimelineBehaviour> inputPlayable =
                     (ScriptPlayable<CameraMixerTimelineBehaviour>)playable.GetInput(i);
                 CameraMixerTimelineBehaviour input = inputPlayable.GetBehaviour();
-                input.cameraPostProductions.Distinct();
 
 #if UNITY_EDITOR
                 
@@ -152,11 +154,14 @@ public override void OnPlayableDestroy (Playable playable)
 
         private void UpdatePostEffect( CameraMixerTimelineBehaviour input)
         {
+            postProductionSet.Clear();
+
             foreach (var postProduction in input.cameraPostProductions)
             {
-                if (postProduction.progress != 0f)
+                if (postProduction.progress != 0f && !postProductionSet.Contains(postProduction))
                 {
                     postProduction.UpdateEffect(input.liveCamera, 0f, 0f);
+                    postProductionSet.Add(postProduction);
                 }
             }
         }