[sdiy] [OT] LPCM question

[Seb Francis]

By the way, I think all this talk about mixing 5 channels down to 2 is 
irrelevant here .. as far as I know LPCM audio is just stereo, but at 
higher sampling-rate and/or bit-count than CD audio.

The software that I gave the link to in my previous email will handle 
both LPCM and AC3 audio ..
http://www.imtoo.com/dvd-audio-ripper.html
Not sure if it would do some mixing down where AC3 is concerned - 
perhaps you would get multichannel audio files out of it which you then 
would have to mix down.  But anyway, with LPCM I think it's only stereo.

I must admit that I haven't tried this software myself, but I do use the 
DVD video ripper from the same company and it works very well.

Seb



Cynthia Webster wrote:

>on 5/15/05 11:23 AM, JH. at jhaible at debitel.net wrote:
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>>I have a stupid question - quite off-topic, but I guess some of you know
>>this
>>without much thinking ...
>>
>>How can I get an audio track from a DVD (the music from a music video, LPCM
>>format), copied to an ordinary Audio CD, such that it will play on an
>>ordinary CD player? Google told me that the LPCM is practical the same
>>format as used on CDs, and I've played around with Nero, DVDShrink etc., but
>>still don't know how to do it. Can anybody tell me?
>>
>>Thanks,
>>
>>JH.
>>    
>>
> 
>Hi Jurgen!
>
>It's been a while since I've authored any DVDs, so forgive me if something
>glaringly obvious doesn't occur to me...
>
>Practically the same, yet ~not~ the same compression format,
>so one challenge will be to somehow uncompress the audio from the DVD
>AC3 format first - before recompressing it into Audio CD format.
>
>DVDs are all standardized in that they divide all of the Video into one
>folder on the DVD, "Video TS", and all of the audio into another folder,
>"Audio TS". ("TS stands for "title set").
>
>These are always at the root level of the DVD and never hidden in a sub
>folder, (or else the DVD Players cannot find them).
>
>(I wonder what an audio CD player would do if it found an audio TS folder
>on a disc?)
>
>Using a disc authoring program you will want to somehow uncompress the
>Audio TS folder which will then probably give you separate files for
>each channel of the surround audio, (i.e. left front audio file,
>center channel audio file, right front audio file, etc).
>
>Then all of these can be mixed back down to stereo in the Audio
>workstation program of your choice, before going to CD.
>Some DVD authoring programs have a separate AC-3 encoding program
>packaged with it and exploring these may yield answers.
>
>As far as Audio workstation programs that might do this,
>Nuendo is the way I'd go.
>
>It might be much much easier to simply connect the outputs of your
>set-top type DVD player to the inputs of your audio recorder using
>RCA cables and do it physically instead of in software.
>
>it might make a big difference if you choose a better player with
>discrete surround outputs, or a cheapo unit that has only outputs
>for Left and Right.  (5.1 is automatically downmixed on most systems
>to stereo if there's no 5.1 output).
>
>You might need a mixer in between the two to spread the center channel
>onto both left and right audio, or the dialog my all disappear,
>(maybe that is not so bad in this case LOL!)
>
>This is an interesting puzzle indeed!
>
>A better place to ask might be the "Recipe for DVD" Yahoo group list
>where there are lots of friendly professionals in this field who can
>probably help you. 
>
>http://groups.yahoo.com/group/recipe4dvd/
>
>Best Wishes!
>
>
>Cynthia
>
>www.cyndustries.com
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