class_docstr: Class for generating a silence
code: def __init__(self, duration=10, samplerate=44100):
      super(SilenceArray, self).__init__(
          duration=duration, samplerate=samplerate
      )
  
      self.array = numpy.zeros((self.num_samples, 1))
  
imports: from __future__ import division
  import gi
  from gi.repository import GLib, Gst
  import numpy
  import scipy.signal.waveforms
  import os.path
  import ffmpeg
label_desc: Use image node_id 1 to create a new SilenceArray object from inherited base classes: SampleArray with example: obj = SilenceArray(duration, samplerate)