const options: XrFrame.IShareRecordOptions = {
  fps: 30,
  width: scene.width,
  height: scene.height,
  videoBitsPerSecond: 1000
};

// 启动录制
await scene.share.recordStart(options);

await scene.share.recordFinishToAlbum(options);

 录制画布没有声音，真的是难受，还要后期处理下。