DVD-Audio questions

[oldiexyz]

Hi cracks,

hope, these aren't too simple newbie questions...

First: It seems there's still no copy / decrypt tool / algorithm around enabling the copy or ripping of DVD-Audios. (The *.AOB-files in the AUDIO_TS folder.) Am I wrong? Or is there such a tool around?

Second: DVD-Audios often contain (in the video section) an 24/96 2ch LPCM track and an 24/96 6ch dts stream. After ripping those to HD, how can I open the 2 ch linear track in CEP pro or another wave editor? I didn't come up with a suitable import filter. And the dts-stream always "only" seems to consist of a 48k sampling stream. Where is the other "half" of the samples??

Thankful for any enlightning...


I.

[Eye of Horus]

Originally posted by oldiexyz
Hi cracks,

hope, these aren't too simple newbie questions...

First: It seems there's still no copy / decrypt tool / algorithm around enabling the copy or ripping of DVD-Audios. (The *.AOB-files in the AUDIO_TS folder.) Am I wrong? Or is there such a tool around?

Second: DVD-Audios often contain (in the video section) an 24/96 2ch LPCM track and an 24/96 6ch dts stream. After ripping those to HD, how can I open the 2 ch linear track in CEP pro or another wave editor? I didn't come up with a suitable import filter. And the dts-stream always "only" seems to consist of a 48k sampling stream. Where is the other "half" of the samples??

Thankful for any enlightning...


I.

I can only help you with the LPCM part.....
You need to process this with a utility , called LPCM241.exe.
After processing, it will load into CE !
It's a freeware utility and here's the link :
http://rarewares.hydrogenaudio.org/others.html

BTW the DTS stream is indeed 48 Khz. I'm also confused about the 96 Khz statements..... Decoding the DTS gives 6 mono 48 Khz WAV's !
can anyone explain what's happening here........ ?

grtz,

EoH

[specise_8472]

Originally posted by Eye of Horus


BTW the DTS stream is indeed 48 Khz. I'm also confused about the 96 Khz statements..... Decoding the DTS gives 6 mono 48 Khz WAV's !
can anyone explain what's happening here........ ?

grtz,

EoH

The DTS specs allow for a +96 khz Extension.
In other words - if your decoder does not support 96khz then it ignores the extension data and only decodes the 48khz signal. This is so the DTS stream is fully compatable with all DTS decoders on the market today.
If you are lucky enouth to have a DTS 96/24 amp you will hear the extra data:p

Interestingly enouth, the new PowerDVD is 96/24 ready. But try to get this out of it? I think it only does this if using a true 96/24 soundcard. Audigy 2.

[oldiexyz]

Hi EoH,

thanks for the pointer!

Hi specise_8472,

sorry, what kind of decoder are you referring to? I get the 48k "signature" in the name of the ripped stream either done with DVD2AVI or with SmartRipper. The Wave demux then leads to 48k Waves. It's like EoH described, still on the digital (PC) level. ???

Thanks,


I.

[specise_8472]

In the DTS Stream look for the sync bytes 1D95F262 for the 96 khz extension. It will be present in every frame there is 96 khz data in.
The data is basically the 'missing' frequencies above 48khz. Which are mixed back into the pcm data as needed.

Also FYI the sync bytes for the extension channels - 6 and above - are
5a5a5a5a.
If both are present then the 96 extension is always first, then the xtra channels.

QUOTE When a 48khz-only (legacy) decoder is fed the core+extension bit stream, the extension data fields are ignored and only the core data is decoded. This results in 48khz core LPCM audio output.

edit
I am pretty sure that if you have a true 96/24 soundcard, then PowerDVD will output 96/24 sound when playing these DTS tracks. The only 96/24 I have outside of DVDAudio is the Queens Greatest Video Hits 1. And it does have the sync bytes.

[oldiexyz]

Sorry, I must confess I don't understand your arguments. When listening to dts from a DVD there are several ways to do so: 1) Send the stream as it is via digital out / in into the decoder. Her the decoding will happen based on the capability of the decoder.

2) Decode in the DVD / DVD-Audio player. The created "waves" are then sent to the amplifier either analogue via six cables and/or downmixed in stereo. Or: The stream is converted in 48k / 96k PCM stereo, which will be sent via digital link to the amplifier(s), depending on the setting in the DVD player.

Off course, one could also use a soundcard as "external" decoder.

But in this thread I'm talking about the "raw" data, being ripped from DVDs or DVD-Audios. I don't think that SmartRipper or vStrip or azidts refer to the capabilities of the soundcard?!? Or do they? (At least azidts, which I use to "demux" into six waves... ???)

Wondering...

I.

[specise_8472]

The way we currently convert DTS to wave is the problem.
None of the DirectShow plugins we use know anything about the extra information in the DTS streams. (Confirmed by playing a true 96/24 in Powerdvd and showing the info at the same time. It only sees 48khz 5.1)
So they only decode the 48khz part and make waves so.
Of course if you output to SPDIF you will get all the info as it is only a passthrough method. (The program dosen't care about anything in the audio stream).

[oldiexyz]

Hmm. That's an explanation. Although not a very satisfying one...
Do you've got any idea when there might be a dts-96k filter be around?

Back to my first part of the original question: Any idea how to backup a DVD-Audio? And... what might be with SACD (DSD instead of PCM and other differences...).

Or is this maybe the wrong forum to ask these questions? Has anybody any clue then about the "correct" forum to aks these questions?

Thanks a lot in anticipation,


I.

[Eye of Horus]

Originally posted by oldiexyz
Hmm. That's an explanation. Although not a very satisfying one...
Do you've got any idea when there might be a dts-96k filter be around?

Back to my first part of the original question: Any idea how to backup a DVD-Audio? And... what might be with SACD (DSD instead of PCM and other differences...).

Or is this maybe the wrong forum to ask these questions? Has anybody any clue then about the "correct" forum to aks these questions?

Thanks a lot in anticipation,


I.

Clone DVD ???

[specise_8472]

DVD Audio uses a different encryption than DVD Video.
AFAIK nobody has cracked it yet. Some ADVDs are not encryted - but not many.

As for SACD, look it up on the net. It uses technology similar to DVD, but different enouth to be a pain. I have a friend with a SB Audigy 2 who says that with hacked drivers you can listen to SACD.
I haven't looked at his system, so can neither confirm nor deny.

BTW he is a member of PARADOX so has access to things I can only dream about:angry:
Plus is an IBM Technician. And has access to the Lord of the Rings Studio (He recently helped install a new BLADE server for the King Kong movie to be done there. The rendering capacity is over double what they used on LOTR. Parts of the final fight sequence of Part 3 was done on it to test it out.