Timestamps of videos for integration with facereader

Builder
1

OS (e.g. Win10): Win11
PsychoPy version (e.g. 1.84.x): 2022.2.4
Standard Standalone? (y/n) If not then what?: y
**What are you trying to achieve?:

Hello everyone!
I am trying to set up an offline experiment, in which I present videos to my participants through Psychopy, and I want to collect information about their facial expressions using Observer XT/Facereader. My plan is to posteriorly integrate the data of both software (offline; after data collection) but for that, I need timestamps of the starting and end of each video in Psychopy.

What did you try to make it work?:
I am using globalClock.getTime() on each frame and with that get the information of the starting time.

What specifically went wrong when you tried that?:
I also need to know the exact time when the presentation stopped. (FYI, duration is set to infinite). Can anyone help?

Many thanks in advance,
Mariana

2

Hi Mariana,

Your video component should have a column in your data output e.g. movie.start - do you see that in the data?

Incidently - it might be of interest to you that for online studies you can already detect and save facial expressions in psychojs - here is a demo and associated code.

Becca