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Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 9:38 pm

Hi everyone. i am currently working on a cover and its the first time i have come across this. the audio is mentioned on all of the places i have looked as LPCM but an image of the actual cover has the dts-hd master audio logo. i was hoping someone had come across this before as i am wondering if it is just a type of audio that can be found through dolby or dts or if it is something completely different. thanks
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:03 pm

It's probably encoded to dts-hd master like the cover says, both are simply uncompressed formats.

About all Criterion single channel monaural audio Blu-rays are Linear Pulse Code Modulation (LPCM) it's just that there is no logo for it as it's a unlicensed format or public domain if you will unlike DTS or Dolby for example where a license fee is required to use them.
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Re: Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 10:12 pm

so could LPCM be either dolby or dts just dependant on the individual movie? ie dont assume if it says LPCM it would be dts?
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:20 pm

Yeah it's like image formats, jpg vs png or tif for example is used comercially a lot as it's uncompressed, in the end the image you see is the same whether it's jpg, png, gif or tif.

But for tif if it's uncompressed, and on the right screen it will be far more detailed, the trade off is size, it will be a huge file like 50meg for TIF vs 5 megs for JPG let's say.

Audio is same way to save space they in the past used compression to shrink it but that creates loss, now a days Blu-ray has so much space audio is not a concern and all the new formats like DTS HD-MA, True HD, DTS X, Atmos are all uncompressed so really other than playback compatibility, meaning your player has to decode each one, they are all licensed separately, other than money they are all the same.

Reason you see different ones used on Discs is like for example Sony might get a better deal from Dolby in bulk to use True HD whereas WB might have made a better deal with DTS to use HD-MA.

As with most things in this world it usually comes down to money lol.
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Re: Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 10:27 pm

ah okay. ive only ever seen dts and dolby when making covers so this was a new one to me. one of the problems i am having with this is that it is a film from the MoC i am working onand i have the technical specs in a box on the cover as well as a logo and i am unsure what to do as i dont know that it would be right having LPCM mono audio in the technical specs and DTS-MA logo.

if this was on a criterion cover what would you do in my place? i came across one site that says one of the MoC versions is Dolby Digital 2.0, which throws me off a little more.  :P
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:34 pm

Understand a lot of info on the web is unverified, unless it's coming direct from a MoC press site it's subject to be wrong.

The studio cover would be the best guide, what does it say.

As I said before a huge percent of Criterion releases use LPCM but the cover makes no reference to it, it just says Monaural.

And again, just to make it clear there is no logo for LPCM, therefore I really see no reason to include it or any reference to it on the cover.
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Re: Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 10:36 pm

the cover has the dts-hd master audio logo. if i am putting that in the technical specs would i just leave out the number that usually follows DTS-HD Master Audio...
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:39 pm

Your not really giving me much info here, beyond your "interpretation" of what you have "seen", I've seen none of this stuff you are taking about so asking me "specific" questions is a little unfair.

You should post a picture of what the studio cover looks like or give me link to the specs your talking about and let me "see" what they say.
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Re: Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 10:45 pm

sorry. not a problem. the movie i am doing is une femme mariee. the LPCM info was from bluray.com as well as the back cover which has the dts logo.

here is a link: http://www.blu-ray.com/movies/Une-femme ... ray/37635/

the other place (the one with dolby digital 2.0) is from DVDbeaver.

here is the link to it: http://www.dvdbeaver.com/film5/blu-ray_ ... lu-ray.htm
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Re: Anyone heard of LPCM?

Postby stampe » Feb Wed 21, 2018 10:51 pm

a DTS-HD MA track IS a LPCM track.
they are both equal in terms of quality (lossless), but the DTS-HD track takes significantly less
space on the disc since it compresses the PCM track to store it and decompresses it again on playback.
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:51 pm

Go with the studio, the Blu-ray is using DTS-HD MA to get the single channel audio onto the center channel, if they pulled it as simple LPCM stream it would get duplicated by the receiver/player and sent to both the left and right channels.

The 2.0 ref you are looking at is for the DVD, DVD's are different, they don't have uncompressed audio so the audio has been duplicated and encoded to both the left and right channels, it's still the same audio as the source is mono to begin with.
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Re: Anyone heard of LPCM?

Postby ctaulbee » Feb Wed 21, 2018 10:53 pm

stampe wrote:a DTS-HD MA track IS a LPCM track.


That's not true, that is a "internet" googled spec, if it were no one would pay DTS to use their encoder, I just said "twice" they were the same in the sense they are both loss less ie uncompressed.
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Re: Anyone heard of LPCM?

Postby stampe » Feb Wed 21, 2018 11:04 pm

im going to respectfully disagree with you. theres a difference between an audio stream and a compression codec, but im gonna leave it at that. its 5am and im sleepy :P
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Re: Anyone heard of LPCM?

Postby Nickaberdeen » Feb Wed 21, 2018 11:07 pm

stampe wrote:im going to respectfully disagree with you. theres a difference between an audio stream and a compression codec, but im gonna leave it at that. its 5am and im sleepy :P


it is a quite complicated conversation for such a late hour (4am here) so maybe ill put it down to sleepiness as to why i am struggling so much with this one.  :P
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