class_docstr: Test transcoding from a missing file
class_docstr_tok: ["Test","transcoding","from","a","missing","file"]
code: def setUp(self):
      self.source = os.path.join(
          os.path.dirname(__file__), "samples/unexisting.wav"
      )
  
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 TestTranscodingFromMissingFile obj's underlying member method code with example usage: obj.setUp() without return types