class_docstr: Test transcoding from wav
class_docstr_tok: ["Test","transcoding","from","wav"]
docstr: Test conversion to m4a
docstr_tok: ["Test","conversion","to","m4a"]
code: def testM4a(self):
      "Test conversion to m4a"
      self.encoder_id = "aac_encoder"
  
imports: from __future__ import division
  from timeside.core.processor import get_processor, ProcessPipe
  from timeside.plugins.decoder.aubio import AubioDecoder
  import os
  import unittest
  from unit_timeside import TestRunner
  from tools import tmp_file_sink
  from timeside.core.tools.test_samples import samples
label_desc: Use image node_id 6 for calling the TestTranscodingFromWav obj's underlying member method code with example usage: obj.testM4a() without return types