title: Python read sound file, ogg or wav?
body: <p>I want to import music in Python, I am using <code>soundfile</code>. I noticed that importing ogg or wav files yield different results, as the following shows (the wav file is a conversion of the ogg file using ffmpeg). Using the code below, I observe a small difference between the ogg and wav files, is this difference normal ?</p>
  
  <p>Edit : I used the following command to convert my <code>ffmpeg -i filename.mp3 newfilename.wav</code></p>
  
  <pre><code>X, sample_rate= sf.read(wav_file)
  print(wav_file)
  print(X[0:20,])
  </code></pre>
  
  <p>And it outputs:</p>
  
  <pre><code>test_inputs/Shikantaza.wav
  [[  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [ -3.05175781e-05  -3.05175781e-05]
   [ -3.05175781e-05   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]
   [  0.00000000e+00   0.00000000e+00]]
  test_inputs/Shikantaza.ogg
  [[  1.17459308e-06   3.78499834e-07]
   [  5.19584228e-06   2.25495864e-06]
   [  1.13173719e-05   6.28675980e-06]
   [  1.07316619e-05   4.50928837e-06]
   [  2.70867986e-06  -3.40946622e-06]
   [  5.37277947e-06   5.06399772e-07]
   [  3.64179391e-06   6.27796169e-07]
   [ -5.09244865e-06  -6.14764804e-06]
   [ -4.38827237e-06  -3.74127058e-06]
   [ -5.41250847e-06  -3.70974522e-06]
   [ -2.75347884e-06  -7.08531957e-07]
   [ -9.67129495e-07   6.15705801e-07]
   [ -4.91217952e-06  -3.82820826e-06]
   [  4.38740926e-06   6.00675048e-06]
   [ -3.00040119e-06  -4.78463562e-08]
   [ -2.18559871e-05  -1.67418439e-05]
   [ -1.57035538e-05  -8.82137283e-06]
   [ -1.28820702e-05  -5.31934711e-06]
   [ -9.44996100e-06  -8.10974825e-07]
   [ -5.33486082e-06   3.71237797e-06]]
  </code></pre>