Millisecond Forums » Millisecond Forums » Inquisit 6 » How to set stimulustimes automatically based on the duration of the video file?

How to set stimulustimes automatically based on the duration of the video file?

ttyelnv — Mon, 15 May 2023 11:36:44 GMT

Hi Dave,
I am wondering if there is a way to automatically set the ending time of stimulus presentation based on the duration of the video file? Can inquisit 6 read the duration of video files automatically and end each movie presentation automatically when the video finishes? Thank you in advance for your help.

RE: How to set stimulustimes automatically based on the duration of the video file?

Dave — Mon, 15 May 2023 11:36:44 GMT

+x[quote]

[b]nuttymenkk - 5/13/2023[/b]
Thank you so much for your reply Dave! If I want to set event marker at the beginning and the end of the video, can I make the following amendment in the script?
Suppose biopac_start is the marker for indicating the start of the video and biopac_end is the marker for indicating the completion of the video. If the video is between 20-40s, will the trial end if I set \trialduration=10? Thank you in advance for your help!

<video examplevideo>
/ items = ("a.mp4")
/ playthrough = true
...
</video>

<trial showvideo>
/ stimulusframes = [1=examplevideo,biopac_start; 2=biopac_end]
/ trialduration = 10
...
</trial>

[/quote]

You'll want a separate <trial> to display the "end" marker.

<video examplevideo>
/ items = ("a.mp4", "b.mp4", "c.mp4")
/ playthrough = true
/ erase = false
</video>

<trial showvideo>
/ stimulusframes = [1=examplevideo, biopac_start]
/ validresponse = 0
/ trialduration = 20
/ branch = [
return trial.sendendmarker;
]
</trial>

<trial sendendmarker>
/ stimulusframes = [1=biopac_end]
/ validresponse = 0
/ trialduration = 20
</trial>

RE: How to set stimulustimes automatically based on the duration of the video file?

ttyelnv — Sat, 13 May 2023 17:24:38 GMT

Thank you so much for your reply Dave! If I want to set event marker at the beginning and the end of the video, can I make the following amendment in the script?
Suppose biopac_start is the marker for indicating the start of the video and biopac_end is the marker for indicating the completion of the video. If the video is between 20-40s, will the trial end if I set \trialduration=10? Thank you in advance for your help!

<video examplevideo>
/ items = ("a.mp4")
/ playthrough = true
...
</video>

<trial showvideo>
/ stimulusframes = [1=examplevideo,biopac_start; 2=biopac_end]
/ trialduration = 10
...
</trial>

RE: How to set stimulustimes automatically based on the duration of the video file?

Dave — Thu, 11 May 2023 11:33:05 GMT

+x[quote]

[b]nuttymenkk - 5/11/2023[/b]
Hi Dave,
I am wondering if there is a way to automatically set the ending time of stimulus presentation based on the duration of the video file? Can inquisit 6 read the duration of video files automatically and end each movie presentation automatically when the video finishes? Thank you in advance for your help.

[/quote]

The way to do this is to set /playthrough = true in the <video> element, which will force any video item to be played to completion. Then set the <trial> presenting the video stimulus to some arbitrary, short /trialduration. The trial will then automatically end when the respective video ends,

<video examplevideo>
/ items = ("a.mp4", "b.mp4", "c.mp4")
/ playthrough = true
...
</video>

<trial showvideo>
/ stimulusframes = [1=examplevideo]
/ validresponse = 0
/ trialduration = 20
...
</trial>