I would like to understand more about the terminology used in the program. I thought I stated that in the message. example: what is a "vob" file extension mean, what is a "TS" file. I have a original movie that was copied to a blank. It stopped and stuttered on my computer close to the end of dvd as did some others that I have. I scanned it for errors with dvdinfo and it found one but successfully read the block the second time. note: the movie played fine on a stand alone TV player.