video files

[Katie U]

Hi all,

I'm trying to load a film clip into E-Prime and for some reason it
won't load the movie file. I've tried multiple formats (both mpg and
avi) to no avail. Other film clips load fine into the same experiment
file, but they're much smaller. Does E-Prime have a limit on the size
of the movie file and that's why it won't load? Thanks in advance!

[David Vinson]

Hi Katie,

It's hard to guess what your problem might be without knowing a little
more (eg video file size, etc). In my experience trying to get videos
of various types to work in E-Prime, most video problems tend to be
codec problems rather than anything else.

You can also do a simple experiment to test whether size matters -
create a video that includes only a few frames of your large/problematic
video, and see whether E-Prime likes it. If it still doesn't work, this
should rule out size as a source of your problem.

If it's a codec problem, here's a very quick summary of what PST Support
suggested to me with a similar problem: download VirtualDub (stable
32-bit version), compress using ffdshow video codec, encoder type MJPEG,
save as AVI.
The very latest build of E-Studio (2.0.8.79) has added a Codec Config
tool, which allows you to render these newly compressed video files
before using them in an experiment. Seems handy in solving such problems
although I haven't worked with this in detail yet.

Your problem could also be something completely different - is the
problem movie file in the experiment directory? (or does it have the
path correctly designated).

good luck,
David V

--
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)

[David McCoy]

www.tbi-impact.org/cde/mod_templates/12_F_08_TMT.pdf

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[Katie U]

Hi David,

Thanks for the suggestion! I think it is a codec problem because the
size of the file isn't an issue and the file path is also correct. I'm
trying VirtualDub, but I keep getting this error when I try to upload
the video file: "VirtualDub requires a Video for Windows (VFW)
compatible codec to decompress video. DirectShow codecs, such as those
used by Windows Media Player, are not suitable".

I've tried this on multiple computers with different types of files
(avi, mpeg, mpeg4, etc.)- is it just that they all do not have the
right codecs to play the file? Do I need to download some type of
converter to use VirtualDub? Thanks again for your help!

-Katie

[Matt]

If you are using the latest version of EP2, definitely run the Codec
Config utility on the movie files to get a better idea of what the
problem is. It will highlight codecs or other issues that are
preventing the movie from being rendered and allow you to make
different selections.