How to extract cover art of flac file or mp3 file

[chen]

I want to use javafx ImageView to display the album art and I know that I can extract cover art using tag like this:

```

    playbin
      .getBus()
      .connect(
        (Bus.TAG) (source, list) -> {
          Object image = list.getValue("image", 0);
          System.out.println(image);
        }
      );
```

But the println output nothing, it just continuously change line. How do I extract the image and know the image type?

Thanks for your help.