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Dolby Vision Support in JRVR
tij:
--- Quote from: bogdanbz on April 05, 2022, 12:11:48 pm ---These questions about DV keep being asked. :)
Dolby Vision playback is only supported on media files originating from streaming services. It is not supported for DV BluRay discs, and there are no plans to.
The display is not switched to DV mode for files for which there is support, either. What happens is that DV metadata is used to perform any "grading" of the video content, and the resulting HDR10 video content is sent to the display in HDR10 mode. What you will see is the same you would have seen on the display in DV mode.
--- End quote ---
Hmmm ... your post implies JRiver can tone map DV profile 5 (or convert it to HDR10) ... i was not aware of that ... better do some testing with MC29 lol
Also ... if what you saying is true ... result will be different from TV going to DV mode as DV use proprietry tone mapping curves ... whether DV will be better is a different subject
bogdanbz:
Yes, DV Profile 5 is converted to HDR10, making use of DV metadata. How to do it was reversed engineered by the open source community. It's maybe not 100% what Dolby does though.
There is indeed a difference between what a display in DV mode can do, and the conversion in software to HDR10.
DV capable displays have colorimetry data measured for them stored in the display (but limited data, such as white point, primaries, and min and max luminosity I think), to be used by the DV chip to map colors to the actual gamut of the display. There are different ways to map from one color gamut to another, so we might indeed get a different conversion to the actual gamut of the display than the one done in software to the BT2020 gamut. And there is no additional tone-mapping near peak luminance done by the display like it happens when the display is in HDR10 mode.
A software conversion will map to the whole BT2020 gamut (or DCI-P3) which is then sent to the display that is in HDR10 mode. The color gamut mapping performed by the display in HDR10 mode is different than the one performed by DV, as it does not use actual colorimetry data of the display and perhaps not the same algorithm (maybe it's absolute colorimetric, maybe it's perceptual, maybe it's something else). Then there is the HDR10 tone-mapping near the peak luminance, which is performed on top of the tone-mapping already done by using the DV metadata. The display in DV mode doesn't apply this additional tone-mapping near peak luminance that a HDR10 display does.
tij:
--- Quote from: bogdanbz on April 05, 2022, 03:27:29 pm ---Yes, DV Profile 5 is converted to HDR10, making use of DV metadata. How to do it was reversed engineered by the open source community. It's maybe not 100% what Dolby does though.
There is indeed a difference between what a display in DV mode can do, and the conversion in software to HDR10.
DV capable displays have colorimetry data measured for them stored in the display (but limited data, such as white point, primaries, and min and max luminosity I think), to be used by the DV chip to map colors to the actual gamut of the display. There are different ways to map from one color gamut to another, so we might indeed get a different conversion to the actual gamut of the display than the one done in software to the BT2020 gamut. And there is no additional tone-mapping near peak luminance done by the display like it happens when the display is in HDR10 mode.
A software conversion will map to the whole BT2020 gamut (or DCI-P3) which is then sent to the display that is in HDR10 mode. The color gamut mapping performed by the display in HDR10 mode is different than the one performed by DV, as it does not use actual colorimetry data of the display and perhaps not the same algorithm (maybe it's absolute colorimetric, maybe it's perceptual, maybe it's something else). Then there is the HDR10 tone-mapping near the peak luminance, which is performed on top of the tone-mapping already done by using the DV metadata. The display in DV mode doesn't apply this additional tone-mapping near peak luminance that a HDR10 display does.
--- End quote ---
just tried it ... and indeed JRVR does play Profile 5 ... nice ... though of little use to me atm ... as I prefer to keep my UHD rips in MKV format and dont see benefit of converting Profile 7 to Profile 5
i guess then ... to play profile 7 ... we need to wait for community to do hard lifting ... recall it took quite a while to crack 3D playback
larryrup:
I use a Shield Pro, with Netflix, Amazon, Plex and Emby apps. DolbyVision from streaming services work fine. Great in fact even with lossy audio. DolbyVision played on either Plex or Emby from a MKV or MP4 file play but at some point starts pausing, and once it starts, the file becomes unwatchable This is NOT the case when played with a Plex or Emby Smart App on my LG OLED. Nvidia has an open ticket from me, but I don't have much confidence they will provide a fix any time soon, as there is very little content available in DV for purchase. One notable exception is West Side Story from Itunes.
I've given up trying to get DV content from any source to play through my Yamaha AVR, even though they advertise DV support. The common blank screen is all I get.
My eyes tell me DV content looks the best, but it seems every manufacturer has had problems at some point. Some have solve the issues. Many still struggling. Certainly HRD10 is not too shabby. I'm losing patience with cable and HBO Max and their lack of support or content in 4K let alone HDR.
Larry
danbez:
Hendrik's summary on the main JRVR thread mentions " - Support for Dolby Vision Metadata in Profile 7 and 8 to enhance the HDR10 image for improved quality":
https://yabb.jriver.com/interact/index.php/topic,132317.0.html
Does that mean that JRVR will also consume the dynamic metadata from Profile 7 as part of its Tonemapping? Tij's reply below suggests that only Profile 5 metadata is being used. And what about FEL improvements?
My scenario requires the video to be ultimately converted to SDR BT.2020 since I use a JVC RS500 projector with poor HDR native support. I wonder if the following assumption is correct:
Source: MKV with DV Profile 7
JRVR would : 1st, consume the DV dynamic metadata as part of its tone mapping to static HDR; 2nd, further convert it to SDR BT.2020 according to my max nits (100 nits).
The 2nd step is what I do with MadVR today (HDR to SDR BT 2020), but I'm curious on how the DV metadata can be used to further improve the final output.
Thanks!
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