Access violation error when playing movie files

Builder
1

Hi,
I am currently setting up a very simple study where participant watch a video and subsequently give a rating response. The videos are 20 s long, so to facilitate testing, I cut them short to just 1 sec using the stop duration parameter.
This works fine when playing just a single video (i.e directly providing the video filename in the movie properties). However, when I put a loop around the the routine to play a different movie on each repeat, I get the error shown at the bottom.

I have a work around (by leaving the ‘stop’ property empy), but thought I’d share this here in the hope that it is helpful for others.

Exception ignored in: <bound method MovieStim3.del of <psychopy.visual.movie3.MovieStim3 object at 0x0000017FDBBD9AC8>>
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
Exception ignored in: <bound method MovieStim3.del of <psychopy.visual.movie3.MovieStim3 object at 0x0000017FDF8DB080>>
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.
2

Does this post help?

3

Hi,
no, I don’t think the filenames are the problem here. The videos do play in a loop when I leave the duration field empty, it is only when I try to restrict the duration to 1 s that the access violation error occurs

4

Instead of setting the duration of the video component to 1 second, try leaving it blank and putting the following in the Each Frame tab of a code component in the same routine.

if t > 1:
     continueRoutine = False
5

Hi @Henning_Holle I am curious if this suggestion solved the problem? What version of PychoPy are you in?

Thanks,
Becca

6

Sorry for my late reply, just to confirm that this got rid of the error and videos now also play online for just the specified duration. Many thanks!

7

Do you think that the full second is seen or is some lost due to the time the video takes to load? I’m not 100% sure when the Routine timer starts.

8

I am afraid I don’t know how to check for that, but have just shared the project with you

9

I’ve just done a screen recording and had times of 4.04-5.03; 5.03-6.04 and 6.04-7.05 which I think is probably within the limits of my measurement accuracy.