Compute and saves the video metrics.

def compute_and_save_video_metrics(
    output_dirs, problem_name, video_length, frame_shape):
  """Compute and saves the video metrics."""
  statistics, all_results = compute_video_metrics_from_png_files(
      output_dirs, problem_name, video_length, frame_shape)
  for results, output_dir in zip(all_results, output_dirs):
    save_results(results, output_dir, problem_name)

  parent_dir = os.path.join(output_dirs[0], os.pardir)
  final_dir = os.path.join(parent_dir, "decode")
  tf.gfile.MakeDirs(parent_dir)

  save_results(statistics, final_dir, problem_name)