text: # import required modules 
  from pyAudioAnalysis import audioBasicIO
  from pyAudioAnalysis import audioFeatureExtraction
  import sys,json, os 
  import numpy as np
  
  def stats(matrix):
      mean=np.mean(matrix)
      std=np.std(matrix)
      maxv=np.amax(matrix)
      minv=np.amin(matrix)
      median=np.median(matrix)
      output=np.array([mean,std,maxv,minv,median])
      return output
  
  def convert_mono(filename):
      mono=filename[0:-4]+'_mono.wav'
      os.system('ffmpeg -i %s -ac 1 %s'%(filename,mono))
      return mono
  
  filename=sys.argv[1]
  print(filename)
  mono=convert_mono(filename)
  [Fs, x] = audioBasicIO.readAudioFile(mono)
  features, labels= audioFeatureExtraction.stFeatureExtraction(x, Fs, 0.050*Fs, 0.025*Fs)
  
  new_features=list()
  new_labels=list()
  
  for i in range(len(features)):
      tfeatures=stats(features[i])
      new_features=np.append(new_features,tfeatures)
      new_labels.append('mean '+labels[i])
      new_labels.append('std '+labels[i])
      new_labels.append('max '+labels[i])
      new_labels.append('min '+labels[i])
      new_labels.append('median '+labels[i])
  
  os.remove(mono)
  os.remove(filename)
  
  data={'features': new_features.tolist(),
  	  'labels': new_labels}
  jsonfile=open(filename[0:-4]+'.json','w')
  json.dump(data,jsonfile)
  jsonfile.close() 
  
  