add a feature to download audio

[relifenoxiao]

我因为训练模型的需要，需要下载大量的音频。

虽然现在可以让他不合并视频和音频，直接把视频删除，但是这太慢了。

所以冒昧的问一下能不能添加一个只下载音频的功能呢？

I need to download a large amount of audio for the purpose of training models.

Although it is currently possible to not merge the video and audio and directly delete the video, but it is too slow.

So can you add a function to download only audio?