Recently I learned a more convenient method using Gordian Knot + AVS:
GDIndex generates D2V project files from DVD VOB files, while extracting audio into AC3 audio files;
BeSweet converts AC3 audio to MP3;
AVS merges the above D2V and MP3 together, and this AVS can be directly compressed into RMVB files using RM tools, done.
Original link: https://snowpeak.blog.csdn.net/article/details/424259