I went through [the documentation](http://ffmpeg.org/ffmpeg.html#Audio-Options) and I can extract a `wav` file from an `mp4` file with the command:

```
ffmpeg -i my_video.mp4 output_audio.wav

```

However, how can I control the quality of the `wav` file? (e.g. say I want to preserve the quality of the original audio as much as I can)