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Trouble with sound in an experiment with video clips.


I am having trouble with presenting a video clips in my experiment. The problem is that sound disappears shortly after playback starts. There is no pattern to it: sometimes it plays a few seconds, other times it last for the half of the video before getting muted. It is very a simple experiment, where participants get 7 randomly presented video clips (3 minutes long at average), and answer a 1 item questionnaire on a 5 point scale followed by 2 minutes pause. I have read many discussions on the platform and tried to change and combine some settings, but nothing worked so far.

Here are the things I've tried:

  • updated the software
  • installed the movie plugin
  • changed backends (video plays only in PyGame, all other backends play the sound but not the visuals, the screen stays black)
  • adjusted settings for legacy (like reducing sampling frequency or increasing sound buffer size)
  • converted the videos in .flv and .avi, tried it as mp4, the problem remains
  • tried to play it in all three sound renderer settings (sounddevice, pyaudio, pygame only the last one allows the experiment to run, the other two result in experiment failure)
  • disabled the scaling of video size to the screen, so they play as originals (to save cpu capacities) These seven videos all have different resolutions, smaller or bigger: it does not influence the occurring problem

Now I have reached the point where I have no Ideas left. So if anybody would be so kind as to think with me, trying to solve this problem, I would be endlessly thankful.

Best Regards,



  • Hi Maria,

    Sound like you've already tried quite a bit. What platform do you use opensesame on? (windows, mac, or linux?)

    Kindly, Robbert

  • Hi Robert,

    i've run it on both mac and windows platforms, the problem persists regardless of the operational system.

  • Hi, sorry for taking so long to get back!

    It sounds like you've tried most of the things I would recommend. Maybe the problem lies with the media you're trying to play. Can share one of the videos that gives a problem?

  • In any case, currently on mac the video playback is only supported using either pygame or expyriment with the pygame sound renderer. It sounds like you tried those 2 combinations (can you confirm this?).

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