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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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Hi everyone, I plan on using inquisit for presenting a series of videos. The videos are in mpeg-2 format. They are in the same folder as the script for the experiment is. Windows media player opens the videos just fine (after instalment of the codec). I have had a run with 'run the monkey' and it tells me that inquisit is unable to open any of the videofiles. part of the video script is below. Any ideas why inquisit won't open the files? best, Thomas --
<video videofriend>
/ erase = true(255, 255, 255)
/ halign = center
/ hposition = 50
/ items = ("A1.mpeg", "A2.mpeg", "A3.mpeg", "A4.mpeg", "A5.mpeg", "A6.mpeg", "A7.mpeg", "A8.mpeg", "A9.mpeg", "A10.mpeg", "A11.mpeg", "A12.mpeg", "A13.mpeg", "A14.mpeg", "A15.mpeg", "A16.mpeg", "A17.mpeg", "A18.mpeg", "A19.mpeg", "A20.mpeg", "A21.mpeg", "A22.mpeg", "A23.mpeg", "A24.mpeg", "A25.mpeg", "A26.mpeg", "A27.mpeg", "A28.mpeg", "A29.mpeg", "A30.mpeg", "A31.mpeg", "A32.mpeg", "A33.mpeg", "A34.mpeg", "A35.mpeg", "A36.mpeg", "A37.mpeg", "A38.mpeg", "A39.mpeg", "A40.mpeg", "A41.mpeg", "A42.mpeg") ) | itemname
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
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Dave
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Group: Administrators
Posts: 12K,
Visits: 98K
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Hi Thomas,
I'm sensing there's something wrong with your definition of the "/ items" attribute in the above syntax.
(1) There's an superfluous closing bracket ")" that you should remove.
(2) The portion stating "| itemname" should also be removed.
Please see if this changes your script's behavior and report back!
~Dave
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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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Thanks for your fast reply! I had noticed this in the mean time as well. I have removed those, but it still does not work. I still get the message unable to open "...:/A1.mpeg" best, Thomas
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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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ok I think I have got it. It should be .mpg and not .mpeg. I will test and report back later. best, Thomas
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seandr
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Group: Administrators
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Visits: 5.6K
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For performance reasons, Inquisit uses DirectShow to present Windows Media video. DirectShow provides the underlying components upon which Windows Media Player is built. Though DirectShow and Windows Media Player are effectively the same thing, for some reason Microsoft decided they would not share codecs. So, you'll need to install the DirectShow codec for the video format you are using. Fortunately, there is a free codec pack called "K Lite" out there that handles most formats. I don't have the link handy, but if you Google "K Lite Codecs" you should find them. -Sean
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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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Thanks for all your replies. It looks like the "monkey" is now happy with the .mpg :). As you might gather I want to use Inquisit to present a series of videostimuli. But I still get error messages unfortunately. It tells me 1) <block videofriend> missing close tag. <block videounknown> missing close tag. While in my script there is a closing tag </block> ? 2) <videofriend2>
/ erase is not a valid attribute As I gather from the help function /erase is a valid function for video stimuli? (This would erase the video after it played and make sure that the last frame of the video doesn't remain? right?). As you might gather I am not that experienced with inquisit, so I am sorry if these questions are really obvious... . Many thanks for all your help, Thomas My script is below. ---
<expt>
/ subjects = (1 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videofriend]
</expt>
<expt>
/ subjects = (2 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videounknown]
</expt>
<defaults>
/ screencolor = (175, 175, 200)
/ font = ("Arial", -21, 700, 0, 34)
/ txcolor = (0, 0, 0)
/ validkeys = ("E", " ", "I")
/ pretrialpause = 200
/ posttrialpause = 200
</defaults>
******** Block Definitions *******
<block videofriend>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(<video videofriend2>)]
</block>
<videofriend2>
/ erase = true(255, 255, 255)
/ halign = center
/ hposition = 50
/ items = ("A1.mpg", "A2.mpg", "A3.mpg", "A4.mpg", "A5.mpg", "A6.mpg", "A7.mpg", "A8.mpg", "A9.mpg", "A10.mpg", "A11.mpg", "A12.mpg", "A13.mpg", "A14.mpg", "A15.mpg", "A16.mpg", "A17.mpg", "A18.mpg", "A19.mpg", "A20.mpg", "A21.mpg", "A22.mpg", "A23.mpg", "A24.mpg", "A25.mpg", "A26.mpg", "A27.mpg", "A28.mpg", "A29.mpg", "A30.mpg", "A31.mpg", "A32.mpg", "A33.mpg", "A34.mpg", "A35.mpg", "A36.mpg", "A37.mpg", "A38.mpg", "A39.mpg", "A40.mpg", "A41.mpg", "A42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
<block videounknown>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(<video videounknown2>)]
</block>
<videounknown2>
/ erase = true(255, 255, 255)
/ halign = center
/ hposition = 50
/ items = ("B1.mpg", "B2.mpg", "B3.mpg", "B4.mpg", "B5.mpg", "B6.mpg", "B7.mpg", "B8.mpg", "B9.mpg", "B10.mpg", "B11.mpg", "B12.mpg", "B13.mpg", "B14.mpg", "B15.mpg", "B16.mpg", "B17.mpg", "B18.mpg", "B19.mpg", "B20.mpg", "B21.mpg", "B22.mpg", "B23.mpg", "B24.mpg", "B25.mpg", "B26.mpg", "B27.mpg", "B28.mpg", "B29.mpg", "B30.mpg", "B31.mpg", "B32.mpg", "B33.mpg", "B34.mpg", "B35.mpg", "B36.mpg", "B37.mpg", "B38.mpg", "B39.mpg", "B40.mpg", "B41.mpg", "B42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
---
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Dave
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Group: Administrators
Posts: 12K,
Visits: 98K
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The videofriend2 element to is missing a proper opening tag (it just says <videofriend2> instead of <video videofriend2>). Same goes for <videounkonwn>. There's also something wrong with the /trials element in your videofriend block. It should probably read / trials = [1-5 = random(videofriend2)]. Those are the mistakes I could make out at a quick glance. Try correcting them and see if that improves your script's behavior.
Best,
~Dave
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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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Thanks for that! The closing tag issue now appears to be sorted. but after applying your solution I get:
/trials: Could not locate element '<videofriend2'.
/trials: Trial 1 is unassigned.
/trials: Trial 2 is unassigned.
/trials: Trial 3 is unassigned.
/trials: Trial 4 is unassigned.
/trials: Trial 5 is unassigned.
This issue disappears if I put trials = [1-5 = random(video videofriend2)]. but then the closing tags issues reappear.... .
Any ideas? (The updated script is below).
Many thanks,
best,
Thomas
--
<expt>
/ subjects = (1 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videofriend]
</expt>
<expt>
/ subjects = (2 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videounknown]
</expt>
<defaults>
/ screencolor = (175, 175, 200)
/ font = ("Arial", -21, 700, 0, 34)
/ txcolor = (0, 0, 0)
/ validkeys = ("E", " ", "I")
/ pretrialpause = 200
/ posttrialpause = 200
</defaults>
******** Block Definitions *******
<block videofriend>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(<videofriend2>)]
</block>
<video videofriend2>
/ erase = true(255, 255, 255)
/ halign = center
/ hposition = 50
/ items = ("A1.mpg", "A2.mpg", "A3.mpg", "A4.mpg", "A5.mpg", "A6.mpg", "A7.mpg", "A8.mpg", "A9.mpg", "A10.mpg", "A11.mpg", "A12.mpg", "A13.mpg", "A14.mpg", "A15.mpg", "A16.mpg", "A17.mpg", "A18.mpg", "A19.mpg", "A20.mpg", "A21.mpg", "A22.mpg", "A23.mpg", "A24.mpg", "A25.mpg", "A26.mpg", "A27.mpg", "A28.mpg", "A29.mpg", "A30.mpg", "A31.mpg", "A32.mpg", "A33.mpg", "A34.mpg", "A35.mpg", "A36.mpg", "A37.mpg", "A38.mpg", "A39.mpg", "A40.mpg", "A41.mpg", "A42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
</block>
<block videounknown>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(<videounknown2>)]
</block>
<video videounknown2>
/ erase = true(255, 255, 255)
/ halign = center
/ hposition = 50
/ items = ("B1.mpg", "B2.mpg", "B3.mpg", "B4.mpg", "B5.mpg", "B6.mpg", "B7.mpg", "B8.mpg", "B9.mpg", "B10.mpg", "B11.mpg", "B12.mpg", "B13.mpg", "B14.mpg", "B15.mpg", "B16.mpg", "B17.mpg", "B18.mpg", "B19.mpg", "B20.mpg", "B21.mpg", "B22.mpg", "B23.mpg", "B24.mpg", "B25.mpg", "B26.mpg", "B27.mpg", "B28.mpg", "B29.mpg", "B30.mpg", "B31.mpg", "B32.mpg", "B33.mpg", "B34.mpg", "B35.mpg", "B36.mpg", "B37.mpg", "B38.mpg", "B39.mpg", "B40.mpg", "B41.mpg", "B42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
</block>
<instruct>
/ font = ("Courier New", -15, 700, 0, 49)
/ nextkey = (" ")
/ nextlabel = "Press space bar to proceed"
/ lastlabel = "Press space bar to proceed"
/ prevkey = ("E")
</instruct>
<page begin1>
^^^
Thank you for taking part in this experiment^
you will see some videos and then^
answer some questions
^^^
</page>
<page instruction>
^^^^
You will be seeing some videos now.^^^
^
</page>
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Dave
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Group: Administrators
Posts: 12K,
Visits: 98K
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Okay, the definition of the /trial attribute in your blocks is still messed up (see my earlier post). But your basic problem is that you're trying to run trials from your blocks that are not yet defined anywhere in the script. You need to add trials to run the video stimuli. For example:
<trial videofriend>
/ stimulusframes = [1 = videofriend]
/ correctresponse = ("E")
/ validresponse = (anyresponse)
</trial>
(I'm not sure whether the trial syntax is complete or additional attributes need to be defined. Can't check that right now.)
And so on for the other categories of video stimuli...
~Dave
P.S.: To make things clearer, here's the basic design logic / hierarchy in Inquisit:
Experiments <expt exptname> run groups of blocks <block blockname>
A block <block blockname> runs a sequence of trials <trial trialname>
A trial <trial trialname> presents one or several stimuli (text, video, sound, etc.)
Each of these elements must be defined in your script.
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evolpsy
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Group: Forum Members
Posts: 9,
Visits: 1
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Thanks for your great help! It is working now! The only issue now is that it freezes after it played the first video? I thought that a /replace command in the trial section would make sure the next trial starts? How do I ensure that a video starts automatically (after a brief pause) when one has finished? (Ideally the participant shouldn't have to do anything just sit there and watch). Thanks for all your great help. best, Thomas
------------
<expt>
/ subjects = (1 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videofriend]
</expt>
<expt>
/ subjects = (2 of 2)
/ preinstructions = (begin1)
/ postinstructions = (end)
/ blocks = [1 = videounknown]
</expt>
<defaults>
/ screencolor = (175, 175, 200)
/ font = ("Arial", -21, 700, 0, 34)
/ txcolor = (0, 0, 0)
/ validkeys = ("E", " ", "I")
/ pretrialpause = 200
/ posttrialpause = 200
</defaults>
******** Block Definitions *******
<block videofriend>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(videofriendtrial)]
</block>
<trial videofriendtrial>
/ pretrialpause = 200
/ stimulusframes = [1 = videofriend2]
/ validresponse = (noresponse)
/ timeout = (replace)
</trial>
<video videofriend2>
/ halign = center
/ hposition = 50
/ items = ("A1.mpg", "A2.mpg", "A3.mpg", "A4.mpg", "A5.mpg", "A6.mpg", "A7.mpg", "A8.mpg", "A9.mpg", "A10.mpg", "A11.mpg", "A12.mpg", "A13.mpg", "A14.mpg", "A15.mpg", "A16.mpg", "A17.mpg", "A18.mpg", "A19.mpg", "A20.mpg", "A21.mpg", "A22.mpg", "A23.mpg", "A24.mpg", "A25.mpg", "A26.mpg", "A27.mpg", "A28.mpg", "A29.mpg", "A30.mpg", "A31.mpg", "A32.mpg", "A33.mpg", "A34.mpg", "A35.mpg", "A36.mpg", "A37.mpg", "A38.mpg", "A39.mpg", "A40.mpg", "A41.mpg", "A42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
</block>
<block videounknown>
/ preinstructions = [(Instruction)]
/ trials = [1-5 = random(videounknowntrial)]
</block>
<video videounknown2>
/ halign = center
/ hposition = 50
/ items = ("B1.mpg", "B2.mpg", "B3.mpg", "B4.mpg", "B5.mpg", "B6.mpg", "B7.mpg", "B8.mpg", "B9.mpg", "B10.mpg", "B11.mpg", "B12.mpg", "B13.mpg", "B14.mpg", "B15.mpg", "B16.mpg", "B17.mpg", "B18.mpg", "B19.mpg", "B20.mpg", "B21.mpg", "B22.mpg", "B23.mpg", "B24.mpg", "B25.mpg", "B26.mpg", "B27.mpg", "B28.mpg", "B29.mpg", "B30.mpg", "B31.mpg", "B32.mpg", "B33.mpg", "B34.mpg", "B35.mpg", "B36.mpg", "B37.mpg", "B38.mpg", "B39.mpg", "B40.mpg", "B41.mpg", "B42.mpg")
/ playthrough = false
/ position = (50, 50)
/ select = noreplace
/ valign = center
/ vposition = 50
</video>
</block>
<trial videounknowntrial>
/ pretrialpause = 200
/ stimulusframes = [1 = videofriend2]
/ validresponse = (noresponse)
/ timeout = (replace)
</trial>
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