getOutputPath(real = null) {
    const { conf, cover } = this;
    let output = conf.getVal('output');

    if (cover && real !== 'final') {
      const pathId = conf.getVal('pathId');
      const dir = conf.getVal('detailedCacheDir');
      output = path.join(dir, pathId + '_cover.mp4');
    }

    return path.normalize(output);
  }
Get the final output file path
@private