Delay between the sound and the image in video

Coding
1

Hallo,
I’m running an experiment that includes videos. I currently only uploaded one short video (about 10 sec, MP4 file) to complete the experiment build, and there is a significant delay between the sound and the image. I tried looking for solutions but could not find anything that worked. what could be the problem?

I’m using MovieStim3,
python 3.6.6
psychopy 2021 2.3

thank you,
Maya

2

Hello, I have the same problem. Have you solved it?

3

Hi!
I also have the same issue with both mp4 and avi formats.
Does anyone know how to fix this?
Psychopy version is 2022.2.1

4

Hi, from version 2022.2.0, the movie component uses ffmpeg as its default backend which should help resolve the lag between audio and video.

5

Hi!

I just updated my psychopy to this version (2022.2.0) but still I have a delay between the image of the video and the related audio.
How can I verify that it is installed the ffmpeg as backend? Because looking at the settings I couldn’t find this option

Thanks a lot!

6

Hi, there’s been an even newer update version 2024.2.2 which you can try upgrading to to see if it fixes it. If not, I would suggest you pre-load your movie stimulus with a static component Static Component — PsychoPy v2024.2.2

7

Hi!
Unfortunately, version 2024.2.2 does not work for me, as I need a version compatible with the Tobii eye tracker.
Thank you so much for your suggestion, though! I’m currently trying to add a static component. Since I have a loop where 6 videos are randomly selected and presented, would it be fine to add the static component within that loop?
What would you recommend?
Thanks in advance!
Marta

8

Yes so instead of selecting set every repeat, you choose set during ISI