Angular14+Electron19中FFmpeg音频分析报错：输出格式null不可用

升级至Angular 14 + Electron 19的项目中，原本正常运行的FFmpeg实现现在失效。调用getAudioVolumes方法时会报错：

An error occurred while analysing: Output format null is not available

组件方法 #

downloadYoutube(id: string){
  const filename = id+'.mp4';
  const filepath = Config.homePath? Config.homePath + '/' + filename : filename;
  const stream =  ytdl(id).pipe(fs.createWriteStream(filepath));
      stream.on('finish', (data) => {
        console.log(stream);
        this.mediaService.getAudioVolumes(stream).subscribe((d) => {console.log('done', d);});
      });
}

服务类代码 #

import ffmpeg from 'fluent-ffmpeg-corrected';
import * as ffmpegBin from 'ffmpeg-static-electron';
import FS from 'fs';
import {Readable} from 'stream';
import {Config} from "../shared/config";

export interface IVolumes {
meanVolume: string;
maxVolume: string;
}

@Injectable()
export class MediaService {
  ffmpegPath = ffmpegBin.path
  .replace('app.asar/bin', 'app.asar.unpacked/' + this.binPath)
  .replace('node_modules/electron/dist/Electron.app/Contents/Resources/electron.asar/renderer/bin', this.binPath)
  .replace('browser/javascript', 'mac/x64') // TODO: platform hardcoded!
  ;

getAudioVolumes(stream: Readable | FS.WriteStream): Observable<IVolumes> {
  if (!Config.isElectron){
  this.ffmpegPath= 'node_modules/ffmpeg-static-electron/bin/mac/x64/ffmpeg';
  }
  ffmpeg.setFfmpegPath(this.ffmpegPath);
      
      return new Observable((observer: NextObserver<IVolumes>) => {
        const that = this;
        ffmpeg(stream)
          .withAudioFilter('volumedetect')
          .addOption('-f', 'null')
          .audioBitrate(128)
  
          .on('progress', function(progress) {
            console.log('Normalising Processing: ' + progress.percent + '% done');
          })
  
          .on('error', function(err) {
            console.log('An error occurred while analysing: ' + err.message);
            observer.error('DBs are not accessible');
          })
  
          .on('end', (stdout: any, stderr: string) => {
            const max = that.parseVolume(stderr, 'max_volume:');
            const mean = that.parseVolume(stderr, 'mean_volume:');
            console.log('volume analysis done, MeanDB is ', mean);
            observer.next({meanVolume: mean, maxVolume: max});
            observer.complete();
          })
          .save('/dev/null');
      });
}

• Fork对应仓库并切换至yt-dl分支
• 在根目录与app目录下分别执行npm install
• 修改以下node模块的package.json：
  • fluent-ffmpeg-corrected 添加："browser": { "fs": false, "child_process": false }
  • isexe 添加："browser": { "fs": false}
• 执行npm run electron:build构建应用
• 运行release目录下的应用，点击Download Kraftwerk按钮，即可触发上述错误

内容的提问来源于stack exchange，提问作者Arco Voltaico