Movie stimulus does not play

Builder
1

Dear community,

I am new to psychopy and am building a short and simple experiment using video stimuli.
Unfortunately they do not work. You find deails and more information including the error message below.

I am very thankful for advice, I am sure, it is just a minor error, but I am stuck for hours and did not find the answer in the disscussion forum.

Best regards, Ines

OS (e.g. Win10): Win 10 pro
PsychoPy version (e.g. 1.84.x): v2021.2.3
Standard Standalone? (y/n) y If not then what?:
**What are you trying to achieve?:**Built a simple paradigm presenting movie stimuli (.mpeg)

**What did you try to make it work?:**vary the size, the path, the moviestim format (.mp4
, .mov)
What specifically went wrong when you tried that?:
The experiment starts, shows a grey screen and then stopps. When I included .png stimuli it worked finde.

Include pasted full error message if possible. “That didn’t work” is not enough information.

Errormessage:
Exception ignored in: <bound method MovieStim3.del of <psychopy.visual.movie3.MovieStim3 object at 0x00000221B06B3A58>>
Traceback (most recent call last):
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\visual\movie3.py”, line 568, in del
self._unload()
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\visual\movie3.py”, line 545, in _unload
self.clearTextures()
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\visual\basevisual.py”, line 1270, in clearTextures
GL.glDeleteTextures(1, self._texID)
OSError: exception: access violation reading 0x0000000000000000

Experiment ended.
Experiment ended.
2

I’ve not tried playing movie stimuli directly, but this Reddit thread may be of interest. The top comment essentially says it could be a library error, so check the relevant library is updated.

Personally when I’ve implemented movies before, I’ve just had them playing on a separate window and had the experiment’s window open and close as appropriate. There we had video from a nature documentary playing as “background” to a musical experiment so it didn’t really matter that we couldn’t pause it. Crude but effective.

3

Many thanks for your reply. It was a simple format error. Once I converted mpeg into mp4 it worked.

Kind regards, Ines

1 Like