code: def get_audio_chunk(fmt, sample_rate, num_channels):
      path = get_asset_path("nasa_13013.mp4")
      s = StreamReader(path)
      for _ in range(num_channels):
          s.add_basic_audio_stream(
              -1, -1, format=fmt, sample_rate=sample_rate
          )
      s.stream()
      s.process_all_packets()
      chunks = [chunk[:, :1] for chunk in s.pop_chunks()]
      return torch.cat(chunks, 1)
  
imports: import io
  import math
  import torch
  import torchaudio
  from parameterized import parameterized, parameterized_class
  from torchaudio.io import CodecConfig, StreamReader, StreamWriter
  from torchaudio_unittest.common_utils import get_asset_path, get_sinusoid, nested_params, rgb_to_yuv_ccir, skipIfNoFFmpeg, skipIfNoModule, TempDirMixin, TorchaudioTestCase
  from .common import lt42
label_desc: Use image node_id 1 for calling a global function with example usage: get_audio_chunk(fmt, sample_rate, num_channels) and returns: torch