code: def get_args(stream_spec, overwrite_output=False):
      
      nodes = get_stream_spec_nodes(stream_spec)
      args = []
      # TODO: group nodes together, e.g. `-i somefile -r somerate`.
      sorted_nodes, outgoing_edge_maps = topo_sort(nodes)
      input_nodes = [node for node in sorted_nodes if isinstance(node, InputNode)]
      output_nodes = [node for node in sorted_nodes if isinstance(node, OutputNode)]
      global_nodes = [node for node in sorted_nodes if isinstance(node, GlobalNode)]
      filter_nodes = [node for node in sorted_nodes if isinstance(node, FilterNode)]
      stream_name_map = {(node, None): str(i) for i, node in enumerate(input_nodes)}
      filter_arg = _get_filter_arg(filter_nodes, outgoing_edge_maps, stream_name_map)
      args += reduce(operator.add, [_get_input_args(node) for node in input_nodes])
      if filter_arg:
          args += ['-filter_complex', filter_arg]
      args += reduce(operator.add, [_get_output_args(node, stream_name_map) for node in output_nodes])
      args += reduce(operator.add, [_get_global_args(node) for node in global_nodes], [])
      if overwrite_output:
          args += ['-y']
      return args
docs: Build command-line arguments to be passed to ffmpeg.