code: def _add_wavscp(self, rec_id, wavpath):
      # use ffmpeg or sox (default ffmepg)
      self.wavscp.append(
          "{} ffmpeg -i {}/{} -f wav -ar 16000 -ac 1 - | ".format(
              rec_id, self.db_path, wavpath
          )
      )
  
file_path: espnet/egs2/dsing/asr1/local/data_prep.py
imports: import argparse
  import hashlib
  import json
  import re
  from os import listdir, makedirs
  from os.path import exists, isfile, join
label_desc: Use image node_id 7 for calling the DataSet obj's underlying member method code with example usage: obj._add_wavscp(rec_id, wavpath) without return types