code: def filter_multi_output(stream_spec, filter_name, *args, **kwargs):
      
      return FilterNode(stream_spec, filter_name, args=args, kwargs=kwargs, max_inputs=None)
docs: Apply custom filter with one or more outputs.
  
      This is the same as ``filter_`` except that the filter can produce more than one output.
  
      To reference an output stream, use either the ``.stream`` operator or bracket shorthand:
  
      Example:
  
          ```
          split = ffmpeg.input('in.mp4').filter_multi_output('split')
          split0 = split.stream(0)
          split1 = split[1]
          ffmpeg.concat(split0, split1).output('out.mp4').run()
          ```