Dolby Vision now possible through MP4 Mux.

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RESET_9999
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Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 12:12 am
That doesn't make much sense.
but it's exactly what's happening. Feel free to provide your version of the pattern and I'll try.
quietvoid
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Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

RESET_9999 wrote:
Fri May 27, 2022 12:13 am
quietvoid wrote:
Fri May 27, 2022 12:12 am
That doesn't make much sense.
but it's exactly what's happening. Feel free to provide your version of the pattern and I'll try.
You can try this: https://0x0.st/oBi5.mkv

However the file I used (multi pattern DV P8.ts) is not the same as the Resolve encode. It has more artifacts.
So either Resolve processed the image or something else.
RESET_9999
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Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 1:27 am
However the file I used (multi pattern DV P8.ts) is not the same as the Resolve encode. It has more artifacts.
So either Resolve processed the image or something else.
thank you
Just tried and the same bug as all the files I did


Image
rkjnsn
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Re: Dolby Vision now possible through MP4 Mux.

Post by rkjnsn »

Okay, another couple of questions. First, I've seen reference to converting P5 to P8 to create "hybrid" streams using the HDR10 BL from the UHD blu-ray combined with the Dolby Vision data available via streaming. Is this ~always the best approach where possible, or are there cases where the blu-ray has scenes encoded at different brightnesses than the streaming base layer, making a madVR measurement the better choice?

Second, if I have a UHD blu-ray of Mulan (2020) along with a Disney+ subscription, is there any way I can capture the RPU metadata myself? E.g., can it be extracted from the streamed data, or is it DRM'd along with the video stream? Is there any tool that can capture the RPU by snooping on a TV-led DV HDMI signal? If not, is there a repository of DV RPU metadata extracted from such sources, or would I have to find a full copy of the streaming version somewhere and extract the RPU from that?
quietvoid
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Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

RESET_9999 wrote:
Fri May 27, 2022 1:37 am
thank you
Just tried and the same bug as all the files I did
Okay, last attempt: https://0x0.st/oB-i.mkv

This is just the Resolve file reencoded.
RESET_9999
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Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 2:13 am
Okay, last attempt: https://0x0.st/oB-i.mkv
This is just the Resolve file reencoded.
no bug for that one.
So it means there's an issue in the source that Resolve somehow manages to fix, and it's only affecting the Shield.
So weird...

Image
quietvoid
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Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

RESET_9999 wrote:
Fri May 27, 2022 2:54 am
no bug for that one.
So it means there's an issue in the source that Resolve somehow manages to fix, and it's only affecting the Shield.
So weird...
Not necessarily, I had changed an encoding setting.

Same settings with the non-Resolve video: https://0x0.st/oB-c.mkv
If that still has issues, then not sure.

The only difference in the Resolve image is that I can't seem to match chroma alignment, and it has less banding in the blue part.
RESET_9999
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Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 3:06 am
Same settings with the non-Resolve video: https://0x0.st/oB-c.mkv
If that still has issues, then not sure.
The only difference in the Resolve image is that I can't seem to match chroma alignment, and it has less banding in the blue part.
bug is back lol
I wonder what magic resolve does.
quietvoid
Posts: 371
Joined: Sun Apr 19, 2020 4:15 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

RESET_9999 wrote:
Fri May 27, 2022 3:10 am
bug is back lol
I guess this is my actual last attempt then: https://0x0.st/oB-B.mkv
It doesn't make sense that the original test pattern causes issues.
Last edited by quietvoid on Fri May 27, 2022 3:32 am, edited 2 times in total.
RESET_9999
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Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

same issue...

I tried NVenc, same issue.
I tried FFmpeg to prores to x265, same issue.
quietvoid
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Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

Clearly the file I have is wrong:
Image

So the only possibibility is that you encoded something else in Resolve.
Or that it did some tone mapping, maybe.

https://slow.pics/c/iu90f2Sp

The answer is definitely that Resolve tone mapped the image, which corrects the gradients.
This is also why Resolve's luma and chroma clip earlier than the original.
NiCE77
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Re: Dolby Vision now possible through MP4 Mux.

Post by NiCE77 »

@quietvoid

Someone replied on the Firecore forum about Apple TV RPU management:
"Apple devices always ignore L2 trim in profile 8.4 video. Actually there are two version of Apple’s profile 8.4, the early version is L1 only and old OS (like ios14) doesn’t handle trims at all (except profile 5). The recent version uses newer algorithm which needs L8 trim."
https://community.firecore.com/t/dolby- ... /19713/302
RESET_9999
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Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 3:32 am
Clearly the file I have is wrong:
So the only possibibility is that you encoded something else in Resolve.
Or that it did some tone mapping, maybe.
https://slow.pics/c/iu90f2Sp
The answer is definitely that Resolve tone mapped the image, which corrects the gradients.
This is also why Resolve's luma and chroma clip earlier than the original.
still doesnt make sense.
The file is the original one unless the bd rip I downloaded got messed up. I dont see how it would cause a luma difference like that and IIRC, the PQ image were identical.
And even stranger, how can it just affect the Shield. And no we did not encode "something" else in resolve.
quietvoid
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Re: Dolby Vision now possible through MP4 Mux.

Post by quietvoid »

RESET_9999 wrote:
Fri May 27, 2022 11:03 am
still doesnt make sense.
The file is the original one unless the bd rip I downloaded got messed up. I dont see how it would cause a luma difference like that and IIRC, the PQ image were identical.
And even stranger, how can it just affect the Shield. And no we did not encode "something" else in resolve.
Of course it makes sense. The input was probably color managed in Resolve, making it tone map.
The metadata shows it: 1000 nits mastering, DCI-P3.

So the Shield apparently doesn't do well with tone mapping from 10k nits + BT.2020 in YCbCr, even with Dolby Vision.

The files only look similar with all planes combined. See single planes: https://slow.pics/c/ZoxjvanI
So what likely happened is that Resolve converted from 10k nits BT.2020 to 1000 nits DCI-P3.

NiCE77 wrote:
Fri May 27, 2022 5:43 am
@quietvoid

Someone replied on the Firecore forum about Apple TV RPU management:
Yeah, I know. Eventually I'll make a CM v4.x only file.
RESET_9999
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Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

quietvoid wrote:
Fri May 27, 2022 11:38 am
So what likely happened is that Resolve converted from 10k nits BT.2020 to 1000 nits DCI-P3.
no, the Resolve encoded file is still 10 000nits.
As for the color management in resolve, you might be right.
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