There’s also a portable version should you not want to use the installable one. It’s available for almost all platforms out there ( Windows, Mac, Linux, BSD etc.).
If you want to understand more on how lossless conversions works, refer to my post on free tools that join video losslessly. You’ll just have to select your output format (a container like MKV or MP4) and the desired bit rate which is what determines the quality and output size of the video. Most video converters will do this for you automatically. 
Should you want to reduce the size of the DVD Video, it’s inevitable that you’ll have to convert the video, and this time with a better codec like H.264/MPEG-4 or HEVC that’s achieves good quality at a fraction of the DVD size. This will ensure that the original quality in the DVD is retained, but the overall video size remains unchanged.ĭoing this will also take only a matter of minutes if not seconds to complete compared to converting. So all we need to do is just change the container with no need for transcoding ( i.e converting). These two are the standard formats found in all DVDs. In VOB, the video codec is MPEG-2 while the audio codec is usually AC3. Now remember VOB, just like MKV, is a container format and not the actual video format (codec). So all we need from a DVD folder are just the VOB files that have the actual video, the rest including menu/chapter segments can be discarded. 
The VOB files are what hold the actual video and DVD menus/chapters, if present. In a typical DVD folder, you’ll find three kinds of files: IFO, BUP and VOB.
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