flutter 自带方法获取视频缩略图

IM中需要发送视频,获取缩略图

 FutureBuilder(
                future: _initializeVideoPlayerFuture,
                builder: (context, snapshot) {
                  if (snapshot.connectionState == ConnectionState.done) {
                    return AspectRatio(
                      aspectRatio: _controller.value.aspectRatio,
                      child: VideoPlayer(_controller),
                    );
                  } else {
                    return Center(child: CircularProgressIndicator());
                  }
                },
              ),
              
              

 _initVideo() {

      if (_controller == null)
        _controller = !text.startsWith('http')
            ? VideoPlayerController.file(LocalFileSystem().file(text))
            : VideoPlayerController.network(text);
      if (_initializeVideoPlayerFuture == null)
        _initializeVideoPlayerFuture = _controller.initialize();
    }
  

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