Store video frame number in the eye-tracking output

Comments

• eduard

  May 2019

  Hi Helio,

  Never tried it myself, but if you can access the frame number through the player (maybe through opencv2?), you can send messages to the logger via pygaze's logging functionality. exp.pygaze_eyetracker.log(), I believe.

  Hope this helps,

  Eduard

  
• heliocuve

  May 2019

  Thanks @eduard , do you know if the current media player was built on top of opencv2?

  
  

  Thanks,

  Hélio
• eduard

  June 2019

  Hi Helio,

  As far as I know, it wasn't (MoviePy, I think).

  Check out the video part of the documentation: https://osdoc.cogsci.nl/3.2/manual/stimuli/video/#opencv

  
  

  Eduard

  
• cesco

  June 2019 edited June 2019

  To add to this, the MoviePy plug-in has the option to run custom code every frame. I don't know how robust it is, due to creating a race condition or otherwise, but this would be easy to test. For example, you could:

  • Edit a video with a specific, known, number of frames.
  • Insert the following inline code in an OpenSesame sequence: framecount = 0
  • Insert the video after; make sure you select 'run custom code: every frame'
  • In the code component, type:

  framecount += 1
  print framecount
  

  • Run in debug mode and see if the number of frames printed match the number in your file.