THis is crazy I have the same problem in Nov 2017. It's a really old bug I can't believe it has not been fixed yet. It's driving me mad I have all these deleted or name changed files on my android and I can't tell if it's a real file or a shadow file pathway that has not been cleaned up upon syncing. Then the app freezes when I mistakenly click on a non-existent file.
No, you have done totally wrong. The VOB files contains much data. The main titles and many other useless one's. DVD is DVD-Video standard which contains Video-TS, IFO, and BUP. You only need to extract the main tile video in VOB for video streaming. You can refer to this articlelink text. Just insert your DVD to your PC, click on "DVD Disc" then press "Okay". After the analysis, click on "Run" to start video streaming. It will automatically extract the DVD content out.