problems with consistent video duration

[Lindsay]

I am setting up an experiment with videos and am playing around with
displaying the videos to make sure it will work for our study. The
videos will play, but they will not play for the whole length every
time. I am using two practice videos, one 13 seconds and one 6 seconds
long, and have the program set up to randomly pull them from a list
and play them after a blank screen. I have tried pre-release, changing
the run time of the videos, and various video formats, but have not
had much success. When I increase the number of cycles, some of the
presentations will run the whole time and some will cut off half-way
through. The timing of the presentation of stimuli is not necessarily
important, but we need each video to run for the set length of time
(about 7 seconds).

We are expanding upon a study that used still images, so we are not as
familiar with the various video formats, compressions, etc. I would
appreciate any help!

Lindsay

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