Presenting slide-object while video is playing

[David McFarlane]

Francesco,

Both MATLAB and Presentation have better visual 
stimulus capabilities than E-Prime (though I 
don't know anything about how they do 
video).  Even so, I would not be surprised if 
they failed to do what you ask here.  Due to the 
very nature of video presentations, what you ask 
requires real-time on-the-fly video mixing 
capabilities, which is a very tall order.  I know 
that intuitively, overlapping a couple of visual 
stimuli seems trivial, but if you think through 
the mechanics of how moving images are made by 
rewriting the screen with each frame, you will 
see that overlapping stimuli with video is not at all trivial.

Good luck,
-- David McFarlane


At 5/15/2012 04:33 AM Tuesday, francesco.biondi at ymail.com wrote:
>Hi David,
>
>the target (eg, a red square) I need to show to 
>participants overlays the video,
>then I cannot use a Slide Objects composed by multiple objects (video+text).
>
>I ve seen you mentioned Matlab; I thought to consider it, but I have no
>updates from that side.
>
>Indeed, about video-editing I am trying to run 
>this way, but I think I would have problems
>with timing, because I should consider both the 
>video's frame-rate and the monitor refresh-rate;
>I guess this may be problematic for the reliability of recorded times.
>
>Suggestions?
>
>2012/5/14 David McFarlane <<mailto:mcfarla9 at msu.edu>mcfarla9 at msu.edu>
>Does any part of your superimposed text overlap 
>with the video?  If so, then you will run into 
>the problem discussed at 
><http://groups.google.com/group/e-prime/browse_thread/thread/2bcf7ebef4211832>http://groups.google.com/group/e-prime/browse_thread/thread/2bcf7ebef4211832 
>.
>
>-----
>David McFarlane
>E-Prime training 
>online: 
><http://psychology.msu.edu/Workshops_Courses/eprime.aspx>http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>Twitter:  @EPrimeMaster 
>(<http://twitter.com/EPrimeMaster>twitter.com/EPrimeMaster)
>
>
>
>At 5/14/2012 08:14 AM Monday, francesco biondi wrote:
>I ve just realised I made a mistake..
>
>when I write slide-objects
>I mean text-objects
>
>Sorry
>
>waiting for reply!
>
>Il giorno lunedì 14 maggio 2012 11:53:50 UTC+2, francesco biondi ha scritto:
>Hi all!
>I ve posted a topic on PSTforum but..no reply yet..
>then, I will turn my problem over to you..
>
>
>I need to show a video to participants using a MovieDisplay-object.
>While the video is playing, I need to show, superimposed to the video,
>some slide-objects covering not the whole display, but only a small
>part of it. After participant's response to the object, the object
>will disappear, but the video will continue without any interruption.
>
>I dont know how I can show slide-objects together with the video
>without interrupting it (letting it play without crashes).
>
>Bye!
>
>and thanks in advance
>
>--
>Francesco Biondi

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