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Old 03-03-2021, 07:53 PM   #21
cleeve cleeve is offline
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HDTVTest did a Dolby Vision streaming vs HDR10 4K Blu-ray Disc comparison:


- Dolby Vision stream’s Average Picture Level (APL) is slightly brighter, creating clearer shadow detail

- More compression artifacts/macroblocking up-close on Dolby Vision stream, but unlikely to be noticed from normal viewing distance

- Posterization in a handful of dark scenes on Dolby Vision stream

- In brighter sequences, specular highlights and detail look similar on both formats

- 4K blu-ray appears slightly darker, probably because it only has one static HDR tone curve for the whole movie, compared to frame-by-frame dynamic metadata with the Dolby Vision stream

- The Dolby Vision stream is able to preserve a bit more detail in bright highlights, like the sun

- Dark scenes generally look brighter and clearer in the Dolby Vision stream

- Both Dolby Vision streaming and HDR-10 4K UHD have their strengths and weaknesses

- Out of the 6 movies he sampled, only 1 (Empire Strikes Back) he preferred on HDR-10 Disc, due to the low 600nit peak brightness of that film’s HDR grading. The rest was preferable on Disney+ streaming



OP, that should answer your question about whether a 4K stream is preferable to an HDR10 4K UHD disc, let alone a standard Blu-ray Disc.

Last edited by cleeve; 03-03-2021 at 08:37 PM.
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Old 03-03-2021, 11:16 PM   #22
cmay91472 cmay91472 is online now
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Quote:
Originally Posted by cleeve View Post
HDTVTest did a Dolby Vision streaming vs HDR10 4K Blu-ray Disc comparison:

https://youtu.be/XbN00Sm0Bsg

- Dolby Vision stream’s Average Picture Level (APL) is slightly brighter, creating clearer shadow detail

- More compression artifacts/macroblocking up-close on Dolby Vision stream, but unlikely to be noticed from normal viewing distance

- Posterization in a handful of dark scenes on Dolby Vision stream

- In brighter sequences, specular highlights and detail look similar on both formats

- 4K blu-ray appears slightly darker, probably because it only has one static HDR tone curve for the whole movie, compared to frame-by-frame dynamic metadata with the Dolby Vision stream

- The Dolby Vision stream is able to preserve a bit more detail in bright highlights, like the sun

- Dark scenes generally look brighter and clearer in the Dolby Vision stream

- Both Dolby Vision streaming and HDR-10 4K UHD have their strengths and weaknesses

- Out of the 6 movies he sampled, only 1 (Empire Strikes Back) he preferred on HDR-10 Disc, due to the low 600nit peak brightness of that film’s HDR grading. The rest was preferable on Disney+ streaming



OP, that should answer your question about whether a 4K stream is preferable to an HDR10 4K UHD disc, let alone a standard Blu-ray Disc.
Curious how 4K streaming HDR compares to 4K HDR disc. Many of us have projectors so the Dolby Vision isn’t applicable, so how would those Dolby Vision titles compare when played back via 4K HDR streaming instead of 4K Dolby Vision when compared to disc.
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Old 03-04-2021, 12:12 AM   #23
Fiffy Fiffy is offline
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Quote:
Originally Posted by cmay91472 View Post
Curious how 4K streaming HDR compares to 4K HDR disc. Many of us have projectors so the Dolby Vision isn’t applicable, so how would those Dolby Vision titles compare when played back via 4K HDR streaming instead of 4K Dolby Vision when compared to disc.
If you use a projector, HDR is pretty much irrelevant for you since consumer projectors don't have the nits to properly display it (thats why no projector manufacturer bothers with DV). For us projector users the detail level and compression quality is more important, since faults are more visible on a big screen.

BTW, this Youtube video should be taken with a grain of salt. HDR can look significantly different on different equipment, since every manufacturer uses their own tone mapping. Dolby Vision can also have equipment-related issues (e.g. remember the elevated black levels that some TVs show when DV is used). I also don't like that he picked only newer CGI-heavy movies and the DNR-infested Empire Strikes Back disc. For a real comparison, some film-based movies with grain should also be used.

Last edited by Fiffy; 03-04-2021 at 12:18 AM.
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Old 03-04-2021, 01:07 AM   #24
tjritter79 tjritter79 is offline
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Quote:
Originally Posted by Fiffy View Post
For a real comparison, some film-based movies with grain should also be used.
That's debatable, film based with grain would mean older than 2010, and that means the HDR is more artificial....like the HDTV Test example TESB. I still think the better HDR is that which is added "natively" via a digital camera during filming. Remastering existing films and adding HDR may be fine to show off your more modern equipment, but its NEVER going to generate the same nits....simply because of the older source material.
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Old 03-04-2021, 01:36 AM   #25
Fiffy Fiffy is offline
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Originally Posted by tjritter79 View Post
That's debatable, film based with grain would mean older than 2010, and that means the HDR is more artificial....like the HDTV Test example TESB. I still think the better HDR is that which is added "natively" via a digital camera during filming. Remastering existing films and adding HDR may be fine to show off your more modern equipment, but its NEVER going to generate the same nits....simply because of the older source material.
UHD is not just about HDR, even though the Youtube guy mainly focuses on that. In fact, for me personally it's not important at all since I almost always use my projector to watch movies (the more cinematic experience is much more important for me than HDR, which is often merely used as a gimmick). I just don't think the movies he used are suitable to judge detail levels and compression.
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Old 03-04-2021, 02:37 AM   #26
tjritter79 tjritter79 is offline
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Quote:
Originally Posted by Fiffy View Post
UHD is not just about HDR, even though the Youtube guy mainly focuses on that. In fact, for me personally it's not important at all since I almost always use my projector to watch movies (the more cinematic experience is much more important for me than HDR, which is often merely used as a gimmick). I just don't think the movies he used are suitable to judge detail levels and compression.
Precisely, which is WHY I didn't mention UHD at all even though it was originally applied ONLY to 4K content. Recently HDR has been applied to HD (1080) content and devices as well.
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