stopping video playback beyond Duration (response contingent)?

[David Vinson]

Here's a follow up to my previous posting as I got a response back from 
E-Prime Support. Perpahs it may prove useful to someone else trying to 
do complicated things with videos.

Here's a summarized version of the support reply. No surprise that David 
M's suggestion was right on track.

A MovieDisplay object does indeed have a Stop method.  If "Stop after" 
property of the MovieDisplay object is set to "Yes", the Stop method is 
automatically called at the end of the object's Duration. If "Stop 
after" is set to "No", the movie plays until its end (or the end time 
specified in the object properties) or until manually stopped.

To manually stop the movie display, InLine code like Movie1.Stop will 
suffice to stop playback of MovieDisplay object named "Movie1".

A small amount of information about MovieDisplay objects can be found 
here:  http://www.pstnet.com/support/kb.asp?TopicID=2720
But this is still very under-documented; I was also advised to take 
advantage of the fact that many characteristics of MovieDisplay objects 
are comparable to those of ImageDisplay or SoundOut (and thus can be 
figured out by using E-Basic help on these objects).

Ultimately a quick request to E-Prime's online support team may well be 
the best way to solve a Movie problem.

cheers,
David V


> Hmm, glad I helped with some solutions. I don't have time to explore the
> movie stopping issue myself just now, so let me just toss out some ideas
> for you to try. I would look for a MovieDisplay equivalent to the the
> Stop method of the SoundOut class (SoundOut.Stop) (or more precisely,
> the SoundBuffer class, SoundBuffer.Stop). This will take some sleuthing,
> as PST has yet to grace us with any documentation for Movies in the
> E-Basic Help facility. To that end, I would also submit a request
> posthaste to PST Web Support at
> http://support.pstnet.com/e%2Dprime/support/login.asp -- this is after
> all pretty much their substitute for the documentation that they should
> provide in the first place, so don't be shy, PST seems to prefer to be
> liberal with their tech support and to document their stuff only on a
> "need to know" basis. And then please post back here with whatever you
> find.
>
> Thanks,
> -- David McFarlane, Professional Faultfinder
>
>
> At 5/23/2011 10:14 AM Monday, you wrote:
>> just a quick follow-up to note that some of my timing issues have been
>> solved - I finally found some posts by David McFarlane that were very
>> helpful with a design like mine.
>>
>> Using extended input to collect response data rather than piecing it
>> together from multiple display objects:
>> http://groups.google.com/group/e-prime/msg/e30fc88284d85e3c
>>
>> Using SetNextTargetOnsetTime to schedule upcoming events:
>> http://groups.google.com/group/e-prime/msg/3f1b16b48a068f14
>>
>> However i'm still looking for ideas about stopping a video in mid-play
>> once its Duration has expired.
>>
>> cheers,
>> David V
>>
>>
>>> I have been wrestling with a MovieDisplay problem and wonder if anyone
>>> on the list has any ideas.
>>>
>>> A simplified version of my trial sequence can be described like this:
>>>
>>> time 0: MovieDisplay begins
>>> time 600: ImageDisplay begins while movie continues
>>> time 2500: end of typical video (range 2000-3100).
>>> Keypress can occur at any time during or after this sequence.
>>>
>>> Feedback on accuracy occurs after the response has been made.
>>>
>>> My current design starts with a MovieDisplay: keypress response,
>>> duration/time limit = 600, stop after = no and end action = terminate.
>>>
>>> If MovieDisplay.RT > 0 the ImageDisplay is skipped, otherwise it's
>>> displayed with duration = infinite (waits forever for a keyboard
>>> response). I log variables for the ImageDisplay and use inline code to
>>> update the logged variables for MovieDisplay as well.
>>>
>>> Then feedback occurs based on MovieDisplay.ACC. The problem is that
>>> often feedback doesn't appear (it's actually being displayed behind the
>>> video which continues until it is finished - video always takes display
>>> priority).
>>>
>>> Is there any way to stop the video once a keypress to MovieDisplay or
>>> ImageDisplay is recorded? I've tried various ways to deal with this (eg
>>> setting Durations to 0 and using inline code to keep time) but have not
>>> figured out a way to pull the plug on a video.
>>>
>>> I have been able to make the feedback display visible, for example
>>> adding a long Wait object before the feedback, or increasing the
>>> duration of the feedback object, or displaying the feedback off center -
>>> but I'd prefer if participants didn't have to wait until the end of
>>> video clips if they have already made early responses.
>>>
>>> any ideas or suggestions would be very helpful!
>>
>>
>> --
>> David Vinson, Ph.D.
>> Senior Postdoctoral Researcher
>> Cognitive, Perceptual and Brain Sciences Research Department
>> University College London
>> 26 Bedford Way, London WC1H 0AP
>> Tel +44 (0)20 7679 5311 (UCL internal ext. 25311)
>


-- 
David Vinson, Ph.D.
Senior Postdoctoral Researcher
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)

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