code: def test_unsupported_codec():
      def reader_fn(files):
          return fn.experimental.readers.video(
              device="cpu", filenames=files, sequence_length=3
          )
  
      wrong_video = os.path.join(video_data_root, "vp9", "vp9_0.mp4")
      msg = "Unsupported video codec"
      yield check_corrupted_videos, reader_fn, wrong_video, msg
  
imports: import os
  import math
  from test_utils import get_gpu_num
  from test_utils import get_dali_extra_path
  import nvidia.dali.ops
  import nvidia.dali.types
  from nvidia.dali.pipeline import Pipeline, pipeline_def
  import nvidia.dali.fn
  import numpy
  import tempfile
  from test_utils import check_output_pattern
  from nose_utils import assert_raises, raises
label_desc: Use image node_id 24 for calling a global function with example usage: test_unsupported_codec() and returns: fn