Sound doesn't play consistently in Chrome

Online experiments
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1

URL of experiment: https://gitlab.pavlovia.org/MBClab/sifi

Description of the problem:

I am designing an experiment where either audio, visual, or audio-visual stimuli must be played. This works fine on firefox, but the audio doesn’t play consistently in chrome. That is, the sound should play for one frame and then stop, and the code is executing in chrome (there is no error message, either), but the sound isn’t heard. This only happens on some of the sound trials; on occasion the sound plays as it should. Here is some of the relevant code:

    if (frameN >= start && soundFlash1.status === PsychoJS.Status.NOT_STARTED){
      // keep track of start time/frame for later
      soundFlash1.tStart = t;  // (not accounting for frame time here)
      soundFlash1.frameNStart = frameN;  // exact frame index

      psychoJS.window.callOnFlip(function(){ soundFlash1.play(); });  // screen flip
      soundFlash1.status = PsychoJS.Status.STARTED;
    }

    if ((soundFlash1.status === PsychoJS.Status.STARTED || soundFlash1.status === PsychoJS.Status.FINISHED) &&
          (frameN >= soundFlash1.frameNStart + 1)){
            if (soundFlash1.status != PsychoJS.Status.FINISHED){
              soundFlash1.tEnd = t;
              soundFlash1.frameNEnd = frameN;
              finalStim = frameN;
            }
            soundFlash1.stop();
            soundFlash1.status = PsychoJS.Status.FINISHED;
    }

I am using a .mp3 audiofile for this. Thank you in advance!

2

Hi Anna,

My guess would be that the onset of the sound is sometimes a bit delayed, so when it’s stopped again, you don’t hear anything. Might it be possible to make a sound that only lasts for one frame instead? (and not stop it via code)

Best, Thomas