video and E Prime 2.0

[Lisa Levinson]

Good to know that I am not alone in attempting to solve this problem but no solution as of yet. I came across a posting from 7/11/11 related to my movie clip problem which David Vinson responded to very thoroughly on 7/13 but while this information does shed some light on my situation it does not seem to completely address my predicament.  For some reason the .avi video files I loaded to E Prime for an experiment are now not running properly after otherwise running without issue during two experimental runs. It seems that the pixelated image (a gray scale gradient that traverses left to right) separates horizontally as it runs for parts of the presentation. The image does not always become disrupted at the same point during the run nor does the image break in the same area. I think the issue may be due to the 100ms stimulus presentation but it is strange that it did at one time run correctly.

A colleague and I attempted to find the change the format code from .avi to mpg but it will not run at all with any of the reformatted versions. I do not think we tried Xvid Codec which I see worked for someone else. That will be Monday's project. Again, not sure if my issue is one of formatting or one of presentation duration. It may be that with EPrime the 100ms run time and various inter-stimulus intervals (600ms-1000ms) makes loading the files in that time frame problematic. Of course, the fact that it worked and now doesn't is the true mystery.

Anyone have thoughts????
Lisa

[Dave]

Sounds like classic "screen tearing" due to vsync being off. C.f. https://en.wikipedia.org/wiki/Screen_tearing.

[Peter Quain]

No idea why it might be intermittent, but It could be tearing:

http://en.wikipedia.org/wiki/Screen_tearing

you could try updating video drivers. Also, try running paradigm on some different machines

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