Videos freezing unpredictably during E-Prime 2.0 expts

[David Vinson]

dear list,

I have a vaguely defined problem, just curious whether there's anyone 
else on this list who has been running experiments with lots of video 
clips - to see whether our own problems are typical or not & maybe 
getting some suggestions for troubleshooting.

We're doing sign language experiments, displaying video clips one at a 
time and collecting a keypress response for each.  Video clips are .avi, 
about 8MB each, and all work fine for display by E-Prime as far as we 
can tell (eg by running a demo program that displays the videos one at a 
time in sequence).

However when we are running the experiment, at a certain point the 
experiment tends to freeze, requiring a hard reboot.  This is usually 
while the video is still on screen and a response has been made, in the 
midst of writing the text file (info logged on a trial), because a line 
in the text file is not written completely, eg

"...
DisplayVideo.ACC: 1
DisplayVideo.RT: 1719
DisplayVi"   [end of text file]

Most of the crashes seem to occur about 1,000,000ms after starting, +/- 
about 10000msec (If the experiment finishes in about 16min or less, it 
seems to go fine... so far). Screen saver is disabled, power settings 
are set to "presentation", anti-virus is not running, etc.


I know this is a problem that should be directed to E-Prime's online 
support at http://support.pstnet.com/e%2Dprime/support/login.asp
but I completely dread the idea of waiting a week or two for their first 
suggestion on such an ill-defined problem.

Any suggestions of any kind would be most welcome - my usual 
troubleshooting approach of re-creating the problem in a very simple 
test experiment doesn't seem to work here: small scale experiments run 
perfectly fine.

Thanks!
dv
-- 
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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