class_docstr: Base helper class for writing videos.
class_docstr_tok: ["Base","helper","class","for","writing","videos","."]
docstr: Saves output to disk.
  
  Args:
    output: result of finish().
code: def save_to_disk(self, output):
      """Saves output to disk.
  
      Args:
        output: result of finish().
      """
      raise NotImplementedError
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  from tensor2tensor.layers import common_layers
  from tensor2tensor.utils import contrib
  import tensorflow.compat.v1
  from tensorflow.python.ops import summary_op_util
label_desc: Use image node_id 4 for calling the VideoWriter obj's underlying member method code with example usage: obj.save_to_disk(output) without return types