title: Cannot properly decode Base64 string from Power Apps to audio file
body: <p>I am trying to properly decode a Base64 string from Power Apps to an audio file. The point is: I do decode it and I can play it. But as soon as I try to <strong>convert</strong> it using ffmpeg or any website, all kind of errors are thrown. I have tried changing the formats too (aac, weba, m4a, wav, mp3, ogg, 3gp, caf), but none of them could be converted to another format.</p>
  
  <p><strong>PS: If I decode the string (which is too big to post here) directly using a website, then the audio file can finally be converted, indicating that the issue is in the code or even in the Python library.</strong> </p>
  
  <p><strong>===============
  CODE ===============</strong></p>
  
  <pre><code>import os
  import base64
  
  mainDir = os.path.dirname(__file__)
  audioFileOGG = os.path.join(mainDir, "myAudio.ogg")
  audioFile3GP = os.path.join(mainDir, "myAudio.3gp")
  audioFileAAC = os.path.join(mainDir, "myAudio.aac")
  binaryFileTXT = os.path.join(mainDir, 'binaryData.txt')
  
  
  with open(binaryFileTXT, 'rb') as f:
      audioData = f.readlines()
      audioData = audioData[0]
  
  with open(audioFileAAC, "wb") as f:
      f.write(base64.b64decode(audioData))
  </code></pre>
  
  <p><strong>Result: the audio file is playable, but it cannot be converted to any other format (I need *.wav).
  What am I missing here?</strong></p>