How to remove the green line at the bottom of assets video in Flutter?

Whenever I play a video from assets in Flutter Application (debug and release mode), it shows green a line at the bottom of video.

The following image represents the problem:

here is my flutter doctor output:

How do I remove that? Did I miss something? Here is my code:

body: Center(
      child: _controller.value.initialized
          ? AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: VideoPlayer(_controller),
            )
          : Container(),
    ),

Thanks in advance.