Actually I think you'd better to rip DVD. Generally a digaital copy need to password to playback it and there is also the time-limited. And most of digital copies has bad quality and worse than DVD disc. What's more, an actived digital copy has DRM and most of video converter can not get rid of it. So I suggest you to use a DVD Ripper to convert your video to 480P video with MP4 foramt. Your Galaxy can palyback it. I remember Leawo has
free DVD to MP4 Converter, you can free download and use it.