If i was doing just AC3 to PCM then what you are suggesting is fine. All the tools mentioned in the link takes a .ac3 file and converts it into a .wav file. I want a tool that takes .vob file and gives a .vob file as an output with the A/V sync ensured.
I tried to do this the round about way by extracting the PCM and video out seperately from the .vob and then putting them back together using a DVD authoring tool. But the authoring tool is re-encoding the audio back to ac3 and then composing the DVD. The authoring tool that i used is DVD Flick, DVDForger and so on.
I can get a avi file with compressed video and PCM audio from VirtualDub. Does anyone have an idea as to how to convert this into a DVD without changing the format of the audio and re-encoding the video alone to MPEG2.