class_docstr: Test transcoding from mp3
class_docstr_tok: ["Test","transcoding","from","mp3"]
code: def setUp(self):
      super(TestTranscodingFromMp3, self).setUp()
      self.source = samples["sweep.mp3"]
      self.source_is_mp3 = True
  
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 1 for calling the TestTranscodingFromMp3 obj's underlying member method code with example usage: obj.setUp() without return types