The Evil 24 Bit/48000/LPCM Audio Stream

[bumpa]

Problem:

I own a Music Video Disk by one of my favorite groups. I would like to be able to be able to edit the clips (via Video Redo/Womble) after ripping them via DVD Decrypter or DVD Shrink. Here is the issue however. The only source audio that comes with the VOB stream is “24 Bit, 48000, LPCM” and it is the 24 bit that is the problem here.

No matter what I do in VideoRedo or Womble Video Wizard 2005. All I hear is a White Noise type of static. Even if I convert the VOB over to MPEG2 it still does this (if the program even lets me load the file)

What I would like to know is if there is anyway to convert the source mentioned above to 16bit? I have tried using every program I could think of from TMPGenc (latest build) and de-multiplexing then re-multiplexing (which will not accept the audio stream), from Wombles which does not even see the audio in the VOB.

I even tried using Besweet light but it did not help.

If anyone has an idea, or had this issue and knows a fix/workaround for this I would be more than humbled.

What scares me is if more DVD’s start coming out like this and there is no solution. From other threads I read none seems to ever have given an answer.

Regards,

Tricksta_

[MTM]

Hi,
i searched for "lpcm" and the 3rd result is this thread: http://forum.doom9.org/showthread.php?t=79803&highlight=lpcm

Maybe this helps,
MTM.

[Wilbert]

Just open the vobs in the latest DGIndex (which supports 24 bit lpcm) and decode to wav.

[Guest]

Point of order. You use 'Demux' for LPCM in DGIndex. That will make a WAV file. You use 'Decode to WAV' only for AC3. LPCM doesn't need to be decoded, only repackaged.

[Rockaria]

Anybody know where the stream info(channel, bit size, sampling rate...) is kept for the LPCM in the DVD(VOB) or any container?
If you strip the wav header from a wav file(if we can call it a container), does it become a (raw) (L) PCM, regardless of the channels?

BTW, I have trouble testing the FFDSHOW's LPCM decoder and encoder(output).

[bumpa]

Thanks for all the feedback. Well this is going to sound like a LAME excuse however I was somehow able to de-mux the video and audio then convert the WAVE file via Cool Edit, and then remux using Muxman. The problem is I forget what the heck I was able to demux with (Very Drunk last night). Like I said...lame excuse.

I am going to go with the tips given to me here on my next round, after work.


Thanks again for the feedback.

Tricksta_

PS -

Seems the DVD's I have run across with this audio for the most part have been the Paramount classics series.

[bumpa]

Once I copied the entire DVD over to HD via DVD Shrink (No Compression) with DVD Region+CSS Free running in taskbar. I then took a chapter, and did a re-author and backed it up to a VOB.

I do believe that I extracted the Video via Womble Wizard 2005 (It see's no AUDIO period) thus just the video is extracted. Then I went into DGIndex and extracted the Audio. After that I edited the audio (Wave) in Cool Edit and converted over to 16 bit. I then loaded the wave into Besweet Light and converted over to AC3. After that I loaded Muxman and Viola ....I had a working file. At this point do I still need to perform anything else to make it a so called "True Mpeg2" or am I set?

Is there a more simple way to demux the audio and video all at once in DGINDEX? Did I take 2 many un-needed steps?

Sorry for the ramble here. I hope to write a guide on this when I am done with pretty screen shots and all. Since the last two DVD's I just grabbed up have that same audio 24 Bit, 48000, LPCM stream in em, and I need to edit the commentary out of the vid clips...thus I need to convert the VOB properly so I can use VideoRedo, etc to edit.


Sorry for the ramble. Hope you can make sense of this.


Tricksta_ :thanks:

[Guest]

Is there a more simple way to demux the audio and video all at once in DGINDEX? Yes. Set Audio/Demux and then do File/Save Project and Demux Video.

[Guest]

Anybody know where the stream info(channel, bit size, sampling rate...) is kept for the LPCM in the DVD(VOB) or any container? Yes, of course; without that DGIndex could not demux LPCM into WAV.

You can find it here (you'll have to pay 5 bucks to see it, though, if you don't already have access to mpucoder's site):

http://mpucoder.com/DVD/ass-hdr.html

Alternatively, you can examine the source code for DGIndex. I use comments. :)

[bumpa]

Donald Graft and Wilbert?

Thanks for all your input on this matter. Just taking the time to browse the msg boards and replying to my question has made all the difference. I will let you know when I get home how all works out. If its that simple I will put together a quick cheat sheet and post it, with a special thanks going out to you.

Regards

Tricksta_

[Rockaria]

Yes, of course; without that DGIndex could not demux LPCM into WAV.
Alternatively, you can examine the source code for DGIndex. I use comments. :)Thanks for the clarification, I will look into the source. :goodpost:

[bumpa]

1) Ripped the Entire DVD via DVD Shrink
2) Selected and Saved the Chapter (Music Video of Choice) to a VOB
3) Opened DGindex, and opened the VOB. Then Selected Demux all Audio tracks, and then did a file/save and Demux Video.
4) Opened up the .wav file in Cool Edit. Converted down to 16 bit, then even Normalized the Audio.
5) Ran BeLite and transcoded the .wav file over to Ac3
6) Ran Muxman and merged the video file created by DGindex with the Ac3.

Renamed the .VOB extension over to .mpg

7) Opened up Video Redo and edited my start and end points.
8 Saved Video file
9) Played perfect in WMPC

Thank you so much for all this help. 2 Weeks of losing my hair over that silly LPCM 24 bit craziness, and you guys gave me a simple fix, that will help me out from now on.


Gracious!

Tricksta_ :goodpost: