Millisecond Forums

Inquisit relies on the codecs available on the system to render videos -- if the system had a suitable codec for rendering MOVs installed, it would work. The MOV format, however, is not well-supported under Windows, i.e. Windows doesn't come with a suitable codec out of the box, and most people will not have sought and installed a suitable codec separately.

You should either use a video format that is supported across platforms out of the box (e.g. MPG) or administer different video formats on different platforms by using conditional <include> elements (i.e. administer MOVs under Mac OS, administer WMVs under Windows).

See the "Remarks" section at https://www.millisecond.com/support/docs/v4/html/language/elements/video.htm

and see https://www.millisecond.com/forums/FindPost9931.aspx for syntax example of conditional <include> elements to administer different formats under different operating systems.

Thanks. I now have both .mpg and .mov versions of the videos but I'm still getting an error. 

unable to open file (file location ending responsevideos.iqx). no such file or directory (Error code: 5)

What am I doing wrong with the syntax?   thank you.

<block videos>
/ screencolor = (255,255,255)
/ trials = [1 = videos]
</block>

<trial videos>
/ stimulusframes = [1 = videotext; 2 = videos]
/ validresponse = (57)
</trial>

<text videotext>
/ items = ("We are interested in what people think of videos that commonly appear on sources like twitter and youtube. On the next page, you will see a randomly selected video from one of those sites. Pelase watch the video and then we will ask you some questions about the video and your attitudes toward various social issues. ")
/ fontstyle = ("Arial", 25, false, false, false, false, 5)
/ size = (40%, 40%)
/ position = (50%,70%)
</text>

<video videos>
/ items = responsevideos
/ select = random
/ selectionrate = block
/ position = (50%,25%)
</video>

<include>
/ precondition=[computer.platform == "windows"]
/ file="responsevideos.iqx"
</include>

<item responsevideos>
/ 1 = "honor.mpg"
/ 2 = "victim.mpg"
/ 3 = "dignity.mpg"
</item>

<include>
/ precondition=[computer.platform == "mac"]
/ file="responsevideos.iqx"
</include>

<item mov_videos>
/ 1 = "honor.mov"
/ 2 = "victim.mov"
/ 3 = "dignity.mov"
</item>

Please re-read https://www.millisecond.com/forums/Topic9930.aspx#bm9931

If you want to take the conditional <include> route, you need _three_ files:

(1) Your first file, lets call it myexperiment.iqx is the main file. It should contain the following and nothing else:

<block videos>
/ screencolor = (255,255,255)
/ trials = [1 = videos]
</block>

<trial videos>
/ stimulusframes = [1 = videotext; 2 = videos]
/ validresponse = (57)
</trial>

<text videotext>
/ items = ("We are interested in what people think of videos that commonly appear on sources like twitter and youtube. On the next page, you will see a randomly selected video from one of those sites. Pelase watch the video and then we will ask you some questions about the video and your attitudes toward various social issues. ")
/ fontstyle = ("Arial", 25, false, false, false, false, 5)
/ size = (40%, 40%)
/ position = (50%,70%)
</text>

<video videos>
/ items = responsevideos
/ select = random
/ selectionrate = block
/ position = (50%,25%)
</video>

<include>
/ precondition=[computer.platform == "win"]
/ file="responsevideos_win.iqx"
</include>

<include>
/ precondition=[computer.platform == "mac"]
/ file="responsevideos_mac.iqx"
</include>


(2) Your 2nd file -- called responsevideos_win.iqx -- should contain the following and nothing else:

<item responsevideos>
/ 1 = "honor.mpg"
/ 2 = "victim.mpg"
/ 3 = "dignity.mpg"
</item>


(3) Your 3rd file -- called responsevideos_mac.iqx -- should contain the following and nothing else:

<item responsevideos>
/ 1 = "honor.mov"
/ 2 = "victim.mov"
/ 3 = "dignity.mov"
</item>

All files should be located alongside each other in the same directory.

thank you so much. this is very helpful.