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» Film-Tech Forum   » Operations   » Digital Cinema Forum   » dcp and blu ray sources

   
Author Topic: dcp and blu ray sources
George Murray
Film Handler

Posts: 23
From: grand forks ND,
Registered: Jun 2012


 - posted 10-28-2013 11:49 PM      Profile for George Murray   Email George Murray   Send New Private Message       Edit/Delete Post 
are dcps and blu rays sourced from the same masters? and if they are wouldnt that make the quality of the two media formats identical or darn close? Has anyone done a direct dcp vs blu ray comparison and can comment on the difference in image quality?

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Brad Miller
Administrator

Posts: 17662
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 10-29-2013 03:15 AM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Most of the time they are pretty close. Take something like the two recent Star Trek movies. The blurays are extremely well authored.

I was however quite disappointed with the bluray of This is the End that I watched part of. It has a video-ish smeared look to it with screwed up gamma. The DCP did NOT look like that.

Its really hit and miss.

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Scott Norwood
Film God

Posts: 7966
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99


 - posted 10-29-2013 07:13 AM      Profile for Scott Norwood   Author's Homepage   Email Scott Norwood   Send New Private Message       Edit/Delete Post 
Even if the scan is the same, they use different compression schemes.

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Mike Blakesley
Film God

Posts: 12393
From: Forsyth, Montana
Registered: Jun 99


 - posted 10-29-2013 03:33 PM      Profile for Mike Blakesley   Author's Homepage   Email Mike Blakesley   Send New Private Message       Edit/Delete Post 
I have found that if I convert a blu-ray to a DCP using software like DVD-o-matic, the sound seems to come out a bit different than if I play the same disk on our blu-ray player. (Oppo) This is converting from a MKV file using the source sound. It's not a huge difference but there is a difference....unless it's the old ears playing tricks?

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Brad Miller
Administrator

Posts: 17662
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 10-29-2013 05:24 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
How is it different? Does your Oppo have 6 channel analog outputs? I ask because the older model Panasonic BDP-30 players had really crappy quality 6 channel discrete outputs and you might be in the same scenario.

What processor do you have and how is the Oppo tied into it?

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Aaron Garman
Phenomenal Film Handler

Posts: 1461
From: Notre Dame du Lac, Indiana USA
Registered: Mar 2003


 - posted 10-29-2013 05:50 PM      Profile for Aaron Garman   Email Aaron Garman   Send New Private Message       Edit/Delete Post 
When creating the MKV from Blu-ray, is it pulling the lossless or lossy core track?

I'm not too familiar with DVD-O-Matic, but does it convert lossless to LPCM or is it converting the lossy core for audio? That could explain differences...

AJG

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12083
From: Annapolis, MD
Registered: Dec 1999


 - posted 10-29-2013 06:03 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
The Oppo has discrete 6-channel (or 8-channel) outputs and the DACs are pretty good. The upper-end Oppos have even better DACs but the standard Oppo is no slouch on the D/A department.

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Lincoln Spector
Film Handler

Posts: 44
From: Albany, CA, USA
Registered: Mar 2012


 - posted 10-29-2013 06:08 PM      Profile for Lincoln Spector   Author's Homepage   Email Lincoln Spector   Send New Private Message       Edit/Delete Post 
quote: Scott Norwood
Even if the scan is the same, they use different compression schemes.
And different color spaces. BDs only have 8-bit color. 2D DCPs have 12-bit.

A well-made Blu-ray can look acceptable on a big screen, but not as good as a DCP.

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Carsten Kurz
Film God

Posts: 3680
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 10-30-2013 06:35 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
When ripping a DVD or BluRay, usually you can choose which of the tracks is extracted. Typically, it is left unaltered in the MKV.

DVD-o-matic converts it to LPCM. Which, in the case of lossless Dolby and DTS formats, should be a 1:1 copy. It also conforms to 48KHz/24Bit if needed, though.

That said, there is, of course, not a single way to do it, depending on which tracks you choose and how you play DCP and BluRay against each other, they may sound slightly different. BluRay Players may have additional audio processing enabled as well.

- Carsten

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12083
From: Annapolis, MD
Registered: Dec 1999


 - posted 10-30-2013 06:39 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
So what ripping program are you all using on the BluRays and DVDs?

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Carsten Kurz
Film God

Posts: 3680
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 10-30-2013 06:39 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
MakeMKV

- Carsten

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Aaron Garman
Phenomenal Film Handler

Posts: 1461
From: Notre Dame du Lac, Indiana USA
Registered: Mar 2003


 - posted 10-30-2013 03:35 PM      Profile for Aaron Garman   Email Aaron Garman   Send New Private Message       Edit/Delete Post 
I use MakeMKV and DVDFab. Depends on the job, but also, if one fails. If it's TrueHD, I use DVDFab because it will give me a TrueHD+core track that works with tsmuxer that somehow, MakeMKV won't.

TrueHD is a bag of hurt. DTS-MA is so much easier to work with.

AJG

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