Error loading video using MovieStim3

Builder
1

If this template helps then use it. If not then just delete and start from scratch.
2OS (e.g. Win10): Win10
PsychoPy version (e.g. 1.84.x): 2021.1.2
Standard Standalone? (y/n) If not then what?: y
What are you trying to achieve?: Running an experiment where the trials show a video

What did you try to make it work?: It works fine on my mac, but when I run it on windows (which I need to do due to incompatibility with the microphone component and mac) I get an error message before the video plays.

WARNING User requested fullscreen with size [1440 900], but screen is actually [1920, 1080]. Using actual size
Traceback (most recent call last):
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\movie3.py”, line 189, in loadMovie
sampleRate=self._mov.audio.fps)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 318, in init
hamming=self.hamming)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 373, in setSound
raise err
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 365, in setSound
blockSize=self.blockSize)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 96, in getStream
blockSize=blockSize)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 135, in _getStream
.format(label, list(self.keys())[0], sys.platform)
psychopy.exceptions.SoundFormatError: Tried to create audio stream 44100_2_128 but 48000_2_128 already exists and win32 doesn’t support multiple portaudio streams

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “C:\Users\aless\Desktop\TaskB\TaskB_lastrun.py”, line 311, in
depth=0.0,
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\contrib\lazy_import.py”, line 120, in call
return obj(*args, **kwargs)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\movie3.py”, line 140, in init
self.loadMovie(self.filename)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\movie3.py”, line 198, in loadMovie
sampleRate=self._mov.audio.fps)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 318, in init
hamming=self.hamming)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 373, in setSound
raise err
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 365, in setSound
blockSize=self.blockSize)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 96, in getStream
blockSize=blockSize)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\sound\backend_sounddevice.py”, line 135, in _getStream
.format(label, list(self.keys())[0], sys.platform)
psychopy.exceptions.SoundFormatError: Tried to create audio stream 44100_2_128 but 48000_2_128 already exists and win32 doesn’t support multiple portaudio streams
Exception ignored in: <bound method MovieStim3.del of <psychopy.visual.movie3.MovieStim3 object at 0x0000016242623DA0>>
Traceback (most recent call last):
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\movie3.py”, line 499, in del
self._unload()
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\movie3.py”, line 476, in _unload
self.clearTextures()
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\basevisual.py”, line 1141, in clearTextures
GL.glDeleteTextures(1, self._texID)
OSError: exception: access violation reading 0x0000000000000000

The video has no sound, but comes after an audio clip (which plays fine)

Thanks!

2

Everything with audio needs to have the same sampling rate. I’ve sometimes opened audio files in audacity to resample

3

@wakecarter okay that’s what I thought but since my movie has no sound to it I’m wondering if this error is from my sound stimulus that plays before the movie ? Which has been running fine, the crash happens after.

4

It doesn’t matter which sample rate you use but both files need to be the same, even if the second one technically doesn’t have any sound.

5

Hi @wakecarter thank you for your help, I checked and my mp4 file and audio file are both the same sampling rate so I’m not sure what else I can do to make this work. I will mess around more with it today and hopefully can fix it. Thanks again

6

Have you tried setting the “noAudio” flag of MovieStim3 to True?

7

Hi @KylieIsenburg , I was wondering whether you got this to work in your experiment? I too had issues getting my videos to play when having an audio component in a previous routine, even though they were encoded with the same sampling rate. I ended up redesigning my experiment without the audio component because then my videos seemed to work!

8

Hi @milsandhills - I worked on this as a grad school rotation project so forgive me if I’m a bit shaky on the details as it was a while ago now. I believe I had to strip audio from the videos to work, and in the end I think it might have had to do with the fact that the hardware I was using was old. I didn’t need the audio component so it was okay for me to remove it. Sorry I can’t be more helpful for you :confused:

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