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1st October 2020, 20:09 | #21 | Link | |
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Does profile 5 support 12-bit? I have mostly worked with profile 7, so not sure if it does or not. With the full enhancement layer, you do get 12-bit support. |
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3rd October 2020, 00:35 | #22 | Link |
Derek Prestegard IRL
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FWIU Profile 5 can reconstruct 12 bit RGB using the 10 bit IPT base layer and the RPU. They do want you to feed in a 12+ bit (ideally 16) when shaping the image into 10 bit IPT.
Ben was also saying before that you actually can do Profile 5 now on UHD-BD (not just 7) |
3rd October 2020, 17:03 | #23 | Link | |
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The RPU does not contain any extra picture information, it just has the various Ls of information such as frame statistics and trim pass values. It is a pretty small file in binary form. Unfortunately BD does not support IPT either. I wish it did, my content shows noise in some super saturated red's due to non-constant luminance of YCbCr. The output of the Dolby engine is always 12-bit, the LSBs are all 0 unless you encode 12-bit or you have a full enhancement layer to reconstruct the original 12-bit signal. IPT by itself does not offer any of that. Last edited by Stacey Spears; 3rd October 2020 at 17:40. |
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4th October 2020, 19:34 | #25 | Link |
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Out of interest... What's the movie?
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6th October 2020, 00:39 | #27 | Link |
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Interesting. So what you're saying is that the output of profile 5 is effectively 10 bit, even though Dolby says the shaping of 12+ bit RGB input into 10 bit IPT lets them preserve more precision during playback?
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6th October 2020, 13:18 | #28 | Link | |
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Have you ever noticed the dark transition between colors on a color bars test pattern? That is due to non-constant luminance of YCbCr. IPT does not suffer from this either. PQ, in general, is at least two bits more efficient than gamma. 12-bit PQ is like 15-bit gamma. |
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8th October 2020, 05:33 | #29 | Link |
Derek Prestegard IRL
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Gotcha. Thanks for sharing.
So, the question becomes - what matters more? 10 bit PQ IPT / ICtCp etc to reduce high saturation noise, or the effective 12 bit YCbCr PQ delivered by DV Profile 7 with a full res enhancement layer? |
9th October 2020, 13:45 | #30 | Link | |
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Streaming services are at a much lower bit rate than optical disc. That will make a difference. I have the same rotating gradient pattern in both HDR10 and DV Profile 7 (MEL). On the C9, the DV has a smoother gradient. The DV is literally the HDR10 encode with dynamic metadata added, so the visual difference is the pipeline in the display. Dolby may simply have better dither, hard to say. |
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12th October 2020, 21:05 | #31 | Link | |
Derek Prestegard IRL
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12th October 2020, 21:29 | #32 | Link | |
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LG's HDR-10 implementation got a lot better in the last few years compared to their early HDR models. |
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18th October 2020, 18:37 | #34 | Link |
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FYI: Anyone seeing the weirdness of MediaInfo reporting that a freshly backed up title having been encoded with x265 and what looks to be the normal command line parameters from a normal encode, update to MediaInfo 20.09. It's also properly detecting the DoVI in titles ripped with MakeMKV 1.15.2 and later.
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18th October 2020, 18:44 | #35 | Link |
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Can anyone enlighten me - what is the proper procedure to create DV (and HDR10?) supported Matroska streams? I'm still wondering if it's possible to re-encode the normal video track to a lower bitrate. Chances are that Kodi will support DV in the future so it would mean that I could use those directly in my media player library.
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19th October 2020, 09:45 | #36 | Link | |
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But it's currently a bit 'hit-and-mis' detecting Dolby Vision meta-data for 'dual-layer' encoded HEVC streams. I've backed-up quite a few 4K UHD discs but the Dolby Vision meta-data is not detected when 'dual-layer' streams are muxed within their original M2TS container.
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19th October 2020, 17:10 | #37 | Link | |
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Plus dynamic metadata is a lot of help. HDR10+ implementations, while not as proscribed as DoVi, are also very good from everything I've seen. The biggest challenge in tone mapping is how to adapt to potential variability, and static metadata isn't of much help. The best HDR-10 implementations do a lot of preanalysis of frames before display and statistical modeling. With dynamic metadata, there's no need to analyze and estimate, since the actual data is right there. And while it's not possible to do much more than a frame or so of lookahead with dynamic metadata over HDMI (although even one frame is a lot of help), when doing playback of streams on a device, it's feasible to read the metadata many frames ahead for even smoother adaption, and more aggressive use of panel capabilities as less headroom is needed to reserve. |
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21st October 2020, 00:50 | #38 | Link |
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ok... and now.. how can I get that RPU file for use with x265? maybe merge two BL.hevc with EL_RPU.hevc with yousesope's tool with "convert to 8.1"... this will create BL+RPU hevc stream, and then demux that hevc file and get BL.hevc and EL_RPU.hevc, but el_rpu.hevc should be only RPU file... which can be used for encoding with x265... did anyone tried that?
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21st October 2020, 09:50 | #39 | Link |
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@jlpsvk,
You might want to checkout various discussions within this forums tsMuxer Open Source topic.
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2nd March 2021, 02:45 | #40 | Link | |
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Last edited by Balling; 2nd March 2021 at 02:48. |
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dolby vision, x265 |
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