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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                     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?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 10-29-2013 03:15 AM                     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.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 10-29-2013 07:13 AM                        Even if the scan is the same, they use different compression schemes.  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 10-29-2013 03:33 PM                        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?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 10-29-2013 05:24 PM                     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?  |  IP: Logged Aaron Garman Phenomenal Film Handler Posts: 1470 From: Toledo, OH USA Registered: Mar 2003 posted 10-29-2013 05:50 PM                     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  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-29-2013 06:03 PM                     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.  |  IP: Logged Lincoln Spector Film Handler Posts: 46 From: Albany, CA, USA Registered: Mar 2012 posted 10-29-2013 06:08 PM                        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.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-30-2013 06:35 AM                     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  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-30-2013 06:39 AM                     So what ripping program are you all using on the BluRays and DVDs?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-30-2013 06:39 AM                     MakeMKV - Carsten  |  IP: Logged Aaron Garman Phenomenal Film Handler Posts: 1470 From: Toledo, OH USA Registered: Mar 2003 posted 10-30-2013 03:35 PM                     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  |  IP: Logged

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