Only Upper-Left Quadrant of GIF being displayed - Why?


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Ariel Zeleznikow-Johnston
Ariel Zeleznikow-Johnston
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Posts: 5, Visits: 20
For some reason I can't fathom, only the upper-left quadrant of any GIFs I try and run are being displayed. Anyone know what's up with that?

Check it out for yourself:

*******************************************************************************************************************************************

<page start>
^Welcome to the experiment !
^^This will take about 20 minutes
</page>

<page end>
^^Thank you for your participation !
</page>

<instruct>
/ nextkey = (57)
/ fontstyle = ("Arial", 10%, true)
/ screencolor = (127,127,127)
/ txcolor = yellow
</instruct>

<text quit_notice>
/ items = ("Press Ctrl + Q to quit the experiment")
/ fontstyle = ("Arial", 2.8%, true)
/ txcolor = yellow
/ txbgcolor = (127,127,127)
/ position = (80,80)
</text>

********************************************************************
********************************************************************

Next Button: Space Button
<text Next_button>
/ items = ("Press SPACE BUTTON to continue")
/ position = (80%,85%)
/ fontstyle = ("Arial", 2.8%, true)
/ txbgcolor = (127,127,127)
/ txcolor = yellow
</text>

********************************************************************
********************************************************************

********************************************************************
********************************************************************
Operation Instruction Page 1:
<text Instruction_Page_1>
/ items = ("Throughout the experiment, focus on the cross at the centre of the screen.
4 circles will flash out quickly somewhere on the screen.
One will then be marked with a black arrow.")
/ hposition = 50%
/ vposition = 70%
/ fontstyle = ("Arial", 3%, true)
/ txbgcolor = (127,127,127)
/ txcolor = yellow
</text>

<video Instruction_Page_1_gif>
/ items = ("multipleinstruction_stimuli.gif")
/ hposition = 50%
/ vposition = 30%
/ loop = true
/ size = (40%,40%)
</video>

<text Instruction_Page_2>
/ items = ("On this page, please decide the dissimilarity level of the colour of the circle that was marked with an arrow
to the colour of the circle in the centre now. Do this for every colour on the response screen.
Ignore any size differences.

0 => most similar colour (least dissimilar colour)
7 => most dissimilar colour (least similar colour)

After choosing, move your cursor back to the centre and click the black rectangle to continue")
/ hposition = 50%
/ vposition = 80%
/ fontstyle = ("Arial", 3%, true)
/ txbgcolor = (127,127,127)
/ txcolor = yellow
</text>


<video Instruction_Page_2_gif>
/ items = ("multipleinstruction_response.gif")
/ hposition = 50%
/ vposition = 30%
/ loop = true
/ size = (40%,40%)
</video>


<text Instruction_Page_3>
/ items = ("During the test, you will see these 9 colors below")
/ hposition = 50%
/ vposition = 20%
/ fontstyle = ("Arial", 3%, true)
/ txbgcolor = (127,127,127)
/ txcolor = yellow
</text>

<trial Instruction_1>
/ stimulusframes = [1 = Instruction_Page_1,Instruction_Page_1_gif,Next_button,quit_notice]
/ validresponse = (57)
/ branch = [
    trial.Instruction_2
]
</trial>
<trial Instruction_2>
/ stimulusframes = [1 = Instruction_Page_2,Instruction_Page_2_gif,Next_button,quit_notice]
/ validresponse = (57)
/ branch = [
    trial.start_prac
]
</trial>


<trial start_prac>
/ stimulusframes = [1 = Next_button]
/ validresponse = (57)
</trial>
********************************************************************
********************************************************************
Attachments
multipleinstruction_stimuli.gif (9 views, 68.00 KB)
multipleinstruction_response.gif (11 views, 1.00 MB)
Ariel Zeleznikow-Johnston
Ariel Zeleznikow-Johnston
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Also, it works fine if I replace the GIF with an mp4. No idea why
Dave
Dave
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Ariel Zeleznikow-Johnston - 5/28/2020
Also, it works fine if I replace the GIF with an mp4. No idea why

It's something about those particular GIFs encoding. Basically, the dimensions indicated in the GIF's metadata do not match the actual GIFs dimensions. If you re-encode them, they'll work just fine.

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