Recovering identical M2V and AC3 bitstreams from VOB

[Ronaldus]

I have used TMPGEnc Plus to encode a mini-DV captured AVI into a MPEG2 video M2V file and VirtualDub + Ffmpeg to get the 16-bit 48 kHz sound to WAV to 192 Kbps AC3. I then authored using TMPGEnc DVD Author to get the VOB files.

I've been told it was possible (and I've seen some threads discussing) demuxing the VOB files back into their source streams. However, I haven't seen anyone mention if any of these tools can recover the byte-for-byte identical M2V and AC3 files from the VOB files? In other words, do they do a simple extraction or a re-encode thereby losing quality?

In one thread it was said TMPGEnc (Plus?) should be used to demux, but the original poster was unable to do it when someone talked about using "mux://" in front of the filename. I thought TMPGEnc was an encoder only... I didn't realize it decoded. Can anyone tell me which tool and what steps to follow to get 100% identical M2V and AC3 (or MPEG2 audio if I go that route) files?

I'm hoping someone has already done this and run binary comparisons to verify the tool's accuracy. I just need a quick push in the right direction. There's so much good information on this site that it's often hard to find exactly what I'm looking for in a sea of threads. Thanks.

[mats.hogberg]

Demuxing does indeed leave the content untouched. It merely separates the video from the audio (in this case).
TMPGEnc can do this, so can ReJig, VOBEdit and other applications.

/Mats