Problem in the sound of audio files presentation

Comments

• rrr

  February 2017

  Hi anapinho,

  Have you checked the audio settings (buffer size, audio devices you are using, and so on)?
• fladd

  February 2017

  Dear anapinho,

  as rrr mentioned, this sounds like an issue with a too low audio buffer. Did you change the audio buffer to a custom value? The default is 2048, which should be high enough. You could try increasing it even further with expyriment.control.defaults.audiosystem_buffer_size = 4096 (this needs to be set before initializing Expyriment).

  Could you also check the specifics of the wav file? What is the bitrate of that for instance?

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• anapinho

  February 2017

  Hello,
  Thank you for your suggestions.

  These are the specifications of my wav files:
  RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz

  I tried to increase the expyriment.control.defaults.audiosystem_buffer_size to 8192 and I still get the same problem. One thing I noticed is that if I open and close twice a file in vlc while running expyriment, the problem is solved. Even though it might be a short-term solution, I still would like to find a more stable long-term solution to this problem.

  Best,
  Ana Luísa
• fladd

  February 2017 edited February 2017

  Very strange. Could you maybe send me one of the files? Then I can check if it works here.

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• anapinho

  February 2017

  Hello,
  I am not allowed to attach .wav files. Is there any other way I can send it to you?

  Thank you.
  Ana Luísa
• fladd

  February 2017

  Depending on the size, you could send it to florian@expyriment.org, or alternatively, send it via services like https://wetransfer.com/

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• fladd

  February 2017

  I just tested with the audio files you sent me and the following script:

  import expyriment as xpy
  
  
  exp = xpy.control.initialize()
  
  s1 = xpy.stimuli.Audio("nord_ou_sud.wav")
  s2 = xpy.stimuli.Audio("ouest_ou_est.wav")
  s1.preload()
  s2.preload()
  
  for x in range(10):
      s1.play()
      xpy.control.wait_end_audiosystem()
      s2.play()
      xpy.control.wait_end_audiosystem()
  

  This worked fine on my computer. I tested with a newer version of Expyriment, though, but that should not make a difference, as there were no changes with regards to audio playback. Does the problem occur with this particular script on your computer? If not, can you send me a script that does show the problem?

  Also, it might be worth to check which Pygame version you are using. I tested with 1.9.3.

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• anapinho

  February 2017

  Hello,
  I am using '1.9.2b8'. Do you think I should upgrade to 1.9.3? I can send my expyriment program if you want, even though it contains many other things. But I am basically loading my Audio, using the same object as you did, i.e. stimuli.Audio().
• anapinho

  February 2017

  Hello once again,
  How did you install pygame 1.9.3? I installed it through pip and I just did an upgrade and I still get the same (apparently beta version).
• fladd

  February 2017

  python -m pip install -U pygame should just work fine. If the installation of Pygame 1.9.3 worked, then you should also get this version when you install it. I don't think two pygame versions can be installed in parallel in the same Python distribution. Are you using different Python installations or virtual environments?

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• anapinho

  February 2017

  Hello,
  I have re-installed pygame to the newest vs, i.e. 1.9.3. I removed the old installation. After several trials (since the problem was apparently random), it seems the problem disappeared. I thus believe it was related to my beta vs of pygame. Thank you very much for your feedback. It helped to solve the problem.
• fladd

  February 2017

  Great to hear the issue is solved!

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