使用wrtc的RTCAudioSink接收远程音频流时获取全空数据块，生成静音MP3文件的问题求助

我正在做一个POC项目，需求是接收远程音频流并写入文件。我用wrtc里的RTCAudioSink订阅了data事件，但每次收到的数据块都是全零的内容：

ArrayBuffer { [Uint8Contents]: <00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ... 220 more bytes>, byteLength: 320 }

最后生成的MP3文件全是静音，我搞不清楚是自己的代码逻辑有问题，还是用的这个库出了问题。

下面是我后端代码的片段：

const path = require('path');
const io = require('socket.io');
const {
  nonstandard: {
    RTCAudioSink,
    RTCVideoSink
  },
  RTCPeerConnection,
  RTCSessionDescription,
  RTCIceCandidate
} = require('wrtc');
// 原代码片段未完整粘贴，保留现有已提供内容

备注：内容来源于stack exchange，提问作者vi max