title: how to add speech training data to tensorflow
body: <p>I have labelled .wav files to train a Convolutional Neural Network. These are for Bengali phones, for which no standard Dataset is available. I want to input these .wav files to Tensorflow for training my CNN model. I want to create Grayscale Spectrograms from these .wav files, which will be input for my model. I need help in how to do so. If there is more than one alternative, what are their strength and weakness?</p>
  
  <p>Also, they are of variable time lengths, like some are 70ms, some are 160ms. Is there a way to divide them in 20ms segments?</p>