private void StartMovie()
    {
        stateText.text      = "ロード中です。";
        button.interactable = false;

        // インスタンスの生成
        if (logoVideo == null)
        {
            logoVideo = Art.Sample.VideoPlay.Create(mainCamera);
        }
        if (opVideo == null)
        {
            opVideo = Art.Sample.VideoPlay.Create(mainCamera);
        }

        // イベント設定
        logoVideo.OnPrepareCompleted = PrepareCompleted;
        logoVideo.OnStarted          = Started;
        logoVideo.OnEnd            = PlayEnd;
        logoVideo.OnErrorReceived  = ErrorReceived;
        opVideo.OnPrepareCompleted = PrepareCompleted;
        opVideo.OnStarted          = Started;
        opVideo.OnEnd           = PlayEnd;
        opVideo.OnErrorReceived = ErrorReceived;

        // 表示を有効にする
        logoVideo.SetEnabled(true);
        opVideo.SetEnabled(true);

        // 事前ロード
        logoVideo.Preload(Application.streamingAssetsPath + "/applibot_3sec.mp4");
        opVideo.Preload(Application.streamingAssetsPath + "/applibot_eagle_movie.mp4");
    }
        /// <summary>インスタンスの生成</summary>
        public static VideoPlay Create(Camera camera = null)
        {
            // シーンを横断する場合はDontDestroyOnLoadにする
            GameObject movieGameObject = new GameObject(kMovieGameObjectName);
            VideoPlay  movieBehaviour  = movieGameObject.AddComponent <VideoPlay>();

            movieBehaviour.Init(movieGameObject, camera);

            return(movieBehaviour);
        }