Ripping the audio & video from a DVD - ??? for a newbie

[novito]

After using DVD Decrypter in IFO Mode for demuxing the main movie I end up with 4 files: *.txt, *.ifo, *.m2v and *.vob.

My question is why I got a *.vob file instead of an *.ac3 file or *.wav file? The original audio of the dvd is in ac3 2 ch, how I know if it is dts or dolby digital? how can I convert the *.vob file for editing the audio? Do I need the *.txt and *.ifo files if I want to re-author the DVD? What is the purpose of these files? Too many qustions for answer, thank you for your help!!

[jimmalenko]

The M2V is your video. I would say that for the audio you had Direct Stream Copy selected instead of demux. If you are editing, chances are you will end up loading your video and audio back into an authoring program, in which case the IFO files are not required. What is in the text file ?

[novito]

I got it...

1) extract the audio ac3 2ch with VOBedit from the .vob file generated by DVD Decrypter
2) convert the ac3 file to .wav with Ac3Tool
3) open the .wav with CoolEdit 2000 and edit it (increase volume)

Next, I will use TMPGenc DVD Author to load the .m2v and .wav files to re-author with no re-encoding and no quality lost.

I think there's no quality lost. Am I wrong?
Thank you for your reply.

The *.txt file contains only the following text:
0x80 - Audio - AC3 / 2ch / 48kHz / DRC / LBA: 95 / PTS: 00:00:00.218 / Delay: -2ms
0xE0 - Video - MPEG-2 / 720x480 (NTSC) / 4:3 / LBA: 2 / PTS: 00:00:00.220 / Delay: 0ms

I still don't know for what reason is the *.ifo file??

[XL3/\/7]

The .txt file is created by the newer versions of DVDDecrypter and it contains information about the audio and video streams of your movie.
All DVDs contain .bup, .ifo & .vob files. The audio languages, the video streams and the subtitles are contained within the .vob files. The ifos are InFormatiOn files, to help the DVD player navigate in the vobs and the bups are ifo BackUPs. When there are bad sectors over the ifos, the DVD will use the bup instead, if it's ok.

[jimmalenko]

The .txt file is created by the newer versions of DVDDecrypter and it contains information about the audio and video streams of your movie.
All DVDs contain .bup, .ifo & .vob files. The audio languages, the video streams and the subtitles are contained within the .vob files. The ifos are InFormatiOn files, to help the DVD player navigate in the vobs and the bups are ifo BackUPs. When there are bad sectors over the ifos, the DVD will use the bup instead, if it's ok.

In addition to this, because you are loading your streams back into ana uthoring program, you won't need to keep the IFOs unless you wish to retain the chapter points.

[johns0]

There`s no need to convert the ac3 to wav cause its already dvd compliant and much smaller than wav format.The volume in ac3 is lower due to the fact that there is a greater dynamic range in the audible levels.

[novito]

Thank you guys for the info about .bup, .ifo and .vob files it was of great help to me.

For johns0, I converted the ac3 audio to wav because I don't know of any program for editing such files, anyway space was no problem.