docstr: Can apply additional effect with filter graph
docstr_tok: ["Can","apply","additional","effect","with","filter","graph"]
code: def test_filter_graph_audio(self):
      """Can apply additional effect with filter graph"""
      sample_rate = 8000
      num_channels = 2
      ext = "wav"
      filename = f"test.{ext}"
  
      original = get_audio_chunk(
          "s16", num_channels=num_channels, sample_rate=sample_rate
      )
  
      dst = self.get_temp_path(filename)
      w = StreamWriter(dst, format=ext)
      w.add_audio_stream(
          sample_rate=8000,
          num_channels=num_channels,
          filter_desc="areverse",
          format="s16",
      )
  
      with w.open():
          w.write_audio_chunk(0, original)
  
      reader = torchaudio.io.StreamReader(
          src=self.get_temp_path(filename)
      )
      reader.add_audio_stream(-1)
      reader.process_all_packets()
      (output,) = reader.pop_chunks()
  
      self.assertEqual(output, original.flip(0))
  
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 14 for calling the StreamWriterCorrectnessTest obj's underlying member method code with example usage: obj.test_filter_graph_audio() without return types