I'm making video to audio converter app but need help to convert video to audio using ffmpeg. I checked many answers and websites but their answers are not easy to understand and I'm confused with command that is used to convert. What is the proper command to convert video to audio and is I'm executing the command in right way?

```java
public class VideoConvertActivity extends AppCompatActivity {

    private VideoView videoView;
    private Button convertButton;
    private String filePath;
    private FFmpeg ffmpeg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video_convert);

        videoView = findViewById(R.id.videoviewID);
        convertButton = findViewById(R.id.convertbuttonID);

        ffmpeg = FFmpeg.getInstance(VideoConvertActivity.this);

// in variable video i'm getting the path of video path from previous activity through intent and that video will have to convert to audio file
        Intent extras = getIntent();
        final String video = extras.getStringExtra("video");

        videoView.setVideoPath(video);
        videoView.start();

        convertButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try {

                    File moviesDir = Environment.getExternalStoragePublicDirectory(
                            Environment.DIRECTORY_MUSIC
                    );

                    String filePrefix = "convert_audio";
                    String fileExtn = ".mp3";
                    File dest = new File(moviesDir, filePrefix + fileExtn);

                    int fileNo = 0;
                    while (dest.exists()) {
                        fileNo++;
                        dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
                    }
                    filePath = dest.getAbsolutePath();

                    // to execute "ffmpeg -version" command you just need to pass "-version"
                    String[] command = {"-y", "-i", video, "-vn", "-ar", "44100", "-ac", "2", "-b:a", "256k", "-f", "mp3", filePath};
                    ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {

                        @Override
                        public void onStart() {
                            Toast.makeText(VideoConvertActivity.this,"Started",Toast.LENGTH_LONG).show();
                        }

                        @Override
                        public void onProgress(String message) {
                            Toast.makeText(VideoConvertActivity.this,"Progress",Toast.LENGTH_LONG).show();
                        }

                        @Override
                        public void onFailure(String message) {
                            Toast.makeText(VideoConvertActivity.this,"Failed",Toast.LENGTH_LONG).show();
                        }

                        @Override
                        public void onSuccess(String message) {
                            Toast.makeText(VideoConvertActivity.this,"Succeed",Toast.LENGTH_LONG).show();
                        }

                        @Override
                        public void onFinish() {
                            Toast.makeText(VideoConvertActivity.this,"Finished",Toast.LENGTH_LONG).show();
                        }
                    });
                } catch (FFmpegCommandAlreadyRunningException e) {
                    // Handle if FFmpeg is already running
                }

                 Toast.makeText(VideoConvertActivity.this,"Converted Successfully",Toast.LENGTH_SHORT).show();

            }
        });

    }

}

```