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"... nothing worked so far ..."
There are many ways to let the user provide a filename. This is the simplest I can think of.
>> filespec = input('Please give a filename: '); Please give a filename: 'c:\temp\my.avi' >> disp(filespec) c:\temp\my.avi >> movie2avi( mov, filespec ) Undefined function or variable 'mov'. >>
I had not assigned a value to mov.
You must describe your problem in some more detail.