unity背景视频循环播放

[RequireComponent(typeof(VideoPlayer))]
    public class BackgroundVideo : MonoBehaviour
    {
        private VideoPlayer _videoPlayer;
        public VideoClip video;
        private RawImage _rawImage;
        [SerializeField]
        [Range(0f, 1f)] public float fadeSpeed = 1f; 
 
        private void Awake()
        {
            //获取Canvas对应的组件
            _videoPlayer = GetComponent<VideoPlayer>();
            _rawImage = GetComponent<RawImage>();
        }
 
        void Start()
        {            
            //视频循环播放
            _videoPlayer.isLooping = false;
            _videoPlayer.clip = video;
        }
        
        void Update()
        {
            //如果videoPlayer没有对应的视频texture，则返回
            if (_videoPlayer.texture == null)
            {
                return;
            }
            //把VideoPlayer的视频渲染到UGUI的RawImage
            _rawImage.texture = _videoPlayer.texture;
            VideoFade();
        }
        //一个淡入的效果
        private void VideoFade()
        {
            _videoPlayer.Play();
            _rawImage.color = Color.Lerp(_rawImage.color, Color.white,fadeSpeed*Time.deltaTime);
        }
 
    }