Use aviinfo() or mmfileinfo() or VideoReader.get() to examine the properties of the AVI file.
It could be that the AVI file uses a codec that you do not have installed. That happens especially for the Indeo5 codec, which is not installed by default in Windows 7, and it is not possible to get a version of the Indeo5 codec that works with a 64 bit version of MATLAB.
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