Also you can create image from game disk with Isobuster and then scan it for mpeg files with
Extractor 2.4
and extract those .mpg file and rename them to .pss , I successfully extracted movies from Gran turismo 3, Fatal frame II, US FFX-2, US unlimited saga, however after scannig the movies.dat in metal gear and zone of the enders, it gave me several invalid mpg files
also in games like splinter cell that all movies are in one file, you can seperate them with this extractor.