MATLAB: How am I to open an avi file for motion tracking

aviavireaderrormmreadermotiontracking

this is what happens when I enter it
>> avi = mmreader('samplevideo4.avi');
??? Initialization failed. (No combination of intermediate filters could be found to
make the connection.)
Error in ==> mmreader.mmreader>mmreader.init at 423
            obj.MMReaderImpl = audiovideo.mmreader(fullName);
Error in ==> mmreader.mmreader>mmreader.mmreader at 133
            obj.init(fileName);
as for aviread
>> avi = aviread('samplevideo4.avi');
Warning: AVIREAD will be removed in a future release. Use MMREADER instead. 
> In aviread at 29
??? Error using ==> aviread at 84
Unable to open file.

Best Answer

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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