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see also
https://nakedonstage.forumfree.it/?t=67371160 a very nice software is AMT, Create Batch Movie ScreenCaps with Auto Movie Thumbnailer -http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Others/AMT-Auto-Movie-Thumbnailer.shtml -http://www.videohelp.com/software/auto-movie-thumbnailer |