Dolby Vision now possible through MP4 Mux.

Please post here for issues related to UHD discs
jesper1994
Posts: 17
Joined: Fri Oct 25, 2019 12:53 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by jesper1994 »

ragico wrote:
Tue Dec 03, 2019 1:01 am
jesper1994 wrote:
Sat Nov 30, 2019 11:42 pm
ragico wrote:
Wed Nov 27, 2019 7:51 pm
I did a few DV mp4 single layer using Dvd Fab with ac3 soundtrack.
I played them using the amazon firestick 4k and emby app for this device. Emby server running on my nas.
Some of these mp4 play normally, others (like spiderman homecoming, The Secret Life of Pets 2 , Game of Thrones seasons 1 and 8 etc) play only audio and black screen. Tv used Panasonic gx serie.
Then I tested the firestick 4k on Lg C8 and had same results.
Therefore I think that the firestick 4K for some unknown (to me) reason do not reproduce video from all the DV mp4 single layer, but just some of them.
Same results using plex (latest beta).
Anyone knows why?
Same problem for me. I have sound, dolby vision is triggered however black screen on firestick 4K LG C7. Which mp4 did play normal, so i can check if i am making a mistake?
For instance,spiderman far from home, casino royale, spectre play normally, while spiderman homecoming, shining, rocketman and others only play audio with black screen both in emby and plex apps for firestick 4k. I have no other device to test eg the ATV 4K.
My believe , supported by what I see in my Lg C8 is that the "true" Dolby Vision is the single layer version. Imho the double version adopted in bluray discs is due to compatibility necessity. In other words if you play a DV disc on a non DV system, you get the hdr version. If you play a single layer DV on an incompatible system you only get audio and a nice steady pic on the display.
I am aware that my opinion is not a technical one, but is perfectly logic.
I posted the "black screen" problem arising from some single layer DV in other forums (amazon and emby) and got no reply from nobody.
I dont think I am the only person experiencing this problem but also here nobody replies.
All those rips work for me playing through a harddrive, however I want to use the new technique that is described earlier to decrease remuxing times. I want to use the adapted player and server., however with that techqnique I get a black screen.
box4m
Posts: 68
Joined: Tue Sep 10, 2019 7:23 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by box4m »

jesper1994 wrote:
Tue Dec 03, 2019 3:15 pm
ragico wrote:
Tue Dec 03, 2019 1:01 am
jesper1994 wrote:
Sat Nov 30, 2019 11:42 pm


Same problem for me. I have sound, dolby vision is triggered however black screen on firestick 4K LG C7. Which mp4 did play normal, so i can check if i am making a mistake?
For instance,spiderman far from home, casino royale, spectre play normally, while spiderman homecoming, shining, rocketman and others only play audio with black screen both in emby and plex apps for firestick 4k. I have no other device to test eg the ATV 4K.
My believe , supported by what I see in my Lg C8 is that the "true" Dolby Vision is the single layer version. Imho the double version adopted in bluray discs is due to compatibility necessity. In other words if you play a DV disc on a non DV system, you get the hdr version. If you play a single layer DV on an incompatible system you only get audio and a nice steady pic on the display.
I am aware that my opinion is not a technical one, but is perfectly logic.
I posted the "black screen" problem arising from some single layer DV in other forums (amazon and emby) and got no reply from nobody.
I dont think I am the only person experiencing this problem but also here nobody replies.
All those rips work for me playing through a harddrive, however I want to use the new technique that is described earlier to decrease remuxing times. I want to use the adapted player and server., however with that techqnique I get a black screen.
Im sorry, trying to read before asking but theres alot of info :D id say im tech savvy but not in this particular area, trying to learn.
daddy
Posts: 77
Joined: Sat Jul 06, 2019 8:17 am

Re: Dolby Vision now possible through MP4 Mux.

Post by daddy »

ragico wrote:
Tue Dec 03, 2019 3:11 pm
Of course there is no "true" or "false" Dolby Vision.
I only underlined that the dual layer profile is only used for UHD discs for compatibility reason.
My preference for quality goes to the single layer profile after watching many movies.
But, unfortunately for me, using the amazon firestick 4K only some of my single layer movies play correctly, others only play audio on a black screen, altough the Dolby Vision logo pos out on the display upper right corner.
This happens on Panasonic Gx TV and on Lg C8.
All Dolby Vision UHD disc are made with DV profile 7 (dvhe.07). This is a rule defined by Dolby.
Dolby never explained how to make a single layer DV (dvhe.05) file. They reserved that for the VOD providers (Netflix, Amazon, disney+, ...)

How can you make a single layer movie from a dual layer movie, without any official tool from Dolby, and to say that it doesn't work when your screen turns black ????
And your preference for quality goes to the single layer profile after watching many movies ... :mrgreen:
ragico
Posts: 257
Joined: Fri Feb 15, 2019 1:09 am

Re: Dolby Vision now possible through MP4 Mux.

Post by ragico »

daddy wrote:
Tue Dec 03, 2019 7:43 pm
ragico wrote:
Tue Dec 03, 2019 3:11 pm
Of course there is no "true" or "false" Dolby Vision.
I only underlined that the dual layer profile is only used for UHD discs for compatibility reason.
My preference for quality goes to the single layer profile after watching many movies.
But, unfortunately for me, using the amazon firestick 4K only some of my single layer movies play correctly, others only play audio on a black screen, altough the Dolby Vision logo pos out on the display upper right corner.
This happens on Panasonic Gx TV and on Lg C8.
All Dolby Vision UHD disc are made with DV profile 7 (dvhe.07). This is a rule defined by Dolby.
Dolby never explained how to make a single layer DV (dvhe.05) file. They reserved that for the VOD providers (Netflix, Amazon, disney+, ...)

How can you make a single layer movie from a dual layer movie, without any official tool from Dolby, and to say that it doesn't work when your screen turns black ????
And your preference for quality goes to the single layer profile after watching many movies ... :mrgreen:
I make the single layer dv from my uhd discs using dvdfab.
I dont know how dvdfab works but confirm that my preferences go to the single layer version.
If, on some files the screen is black, is a firestick 4k problem.
I am entitled to my watching preferences
jesper1994
Posts: 17
Joined: Fri Oct 25, 2019 12:53 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by jesper1994 »

ragico wrote:
Tue Dec 03, 2019 8:31 pm
daddy wrote:
Tue Dec 03, 2019 7:43 pm
ragico wrote:
Tue Dec 03, 2019 3:11 pm
Of course there is no "true" or "false" Dolby Vision.
I only underlined that the dual layer profile is only used for UHD discs for compatibility reason.
My preference for quality goes to the single layer profile after watching many movies.
But, unfortunately for me, using the amazon firestick 4K only some of my single layer movies play correctly, others only play audio on a black screen, altough the Dolby Vision logo pos out on the display upper right corner.
This happens on Panasonic Gx TV and on Lg C8.
All Dolby Vision UHD disc are made with DV profile 7 (dvhe.07). This is a rule defined by Dolby.
Dolby never explained how to make a single layer DV (dvhe.05) file. They reserved that for the VOD providers (Netflix, Amazon, disney+, ...)

How can you make a single layer movie from a dual layer movie, without any official tool from Dolby, and to say that it doesn't work when your screen turns black ????
And your preference for quality goes to the single layer profile after watching many movies ... :mrgreen:
I make the single layer dv from my uhd discs using dvdfab.
I dont know how dvdfab works but confirm that my preferences go to the single layer version.
If, on some files the screen is black, is a firestick 4k problem.
I am entitled to my watching preferences
Is it possible to make rips with DTS audio with DVDFab or do you have to add that later with MP4box?
DaMacFunkin
Posts: 311
Joined: Tue Oct 30, 2018 4:17 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by DaMacFunkin »

Add it later.
anhlong1910
Posts: 3
Joined: Mon Dec 09, 2019 2:36 am

Re: Dolby Vision now possible through MP4 Mux.

Post by anhlong1910 »

thelittleworm wrote:
Wed Dec 26, 2018 10:37 pm
So apparently there's a method to backup UHD ISO's into MP4's that triggers Dolby Vision on an LG or Vizio television app via USB. I made this thread in the hopes we can figure out a way to reconvert this into MKV. The procecure is the following -



1. Make ISO of movie. I have only tested this with Black Panther since that's the only one I own. I will be buying Gladiator this weekend to test out though.

2. Use TS Muxer to open the ISO. Find the correct M2TS file and demux the following files:
A. HEVC1 in 4K (Base layer)
B. HEVC 2 in 1080p (this is the dolby vision enhancement layer)
C. Audio track which you will have to convert to AC3. This is a hard line limitation- you need to use AC3!!!

3. Once you have HEVC1, HEVC2, and the Audio track. Run Dolby Vision MP4Muxer (https://github.com/DolbyLaboratories/dlb_mp4base)
DolbyVision MP4 Muxer only works in Command Prompt so you have to navigate to the corresponding folders where the files are and type


mp4muxer --dv-profile 7 --input-file (baselayername.hevc1) --input-file (dvlayername.hevc2) --input-file (audio.ac3) --media-lang eng --output-file (nameofmovie).mp4


*Right now we are limited to only MP4 and AC3 audio. Hoping we figure out an MKV solution.

It sounds like its complicated, but it isn't. The entire process took me an hour to figure out, but once I did it, I sold my Xbox One X, because I'm now using my LG USB to play Dolby Vision MP4's! Hopefully this starts a discussion.
Hi folks,
I am newbie here. I would love to test Dolby Vision but I am too noob to follow your instruction because I know nothing of Command Line. Could you guys please help me with a step by step tutorial. Really Appreciate folks!
daddy
Posts: 77
Joined: Sat Jul 06, 2019 8:17 am

Re: Dolby Vision now possible through MP4 Mux.

Post by daddy »

step by step instruction to build a mp4 with dual layer dv from a multi m2ts disc like Gladiator.
https://www.makemkv.com/forum/viewtopic ... 820#p76820
flummel
Posts: 1
Joined: Tue Dec 10, 2019 7:02 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by flummel »

Remux with Dolby Atmos.

Heya Guys,

can you help me? I recently did a Remux with Dolby Vision and Dolby Atmos. Did it with mp4muxer and mp4box. So far. Now if i Stream it to my TV with Plex the Video file loads endless. If i Play it in MPC-HC it works.

MediaInfo:

Code: Select all

Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42/dby1)
File size                                : 70.7 GiB
Duration                                 : 2 h 21 min
Overall bit rate                         : 71.4 Mb/s
Encoded date                             : UTC 2019-12-07 17:32:27
Tagged date                              : UTC 2019-12-07 17:32:27

Video #1
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Commercial name                          : HDR10
Format profile                           : Main 10@L5.1@High
Codec ID                                 : hev1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 2 h 15 min
Bit rate                                 : 58.8 Mb/s
Maximum bit rate                         : 111 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.296
Stream size                              : 55.8 GiB (79%)
Default                                  : No
Encoded date                             : UTC 2019-12-07 16:50:07
Tagged date                              : UTC 2019-12-07 18:34:18
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level              : 1000 cd/m2
Maximum Frame-Average Light Level        : 419 cd/m2

Video #2
ID                                       : 2
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Commercial name                          : HDR10
Format profile                           : Main 10@L5.1@High
Dolby Vision                             : 1.0, dvhe.dtb@uhd24, EL+RPU
Codec ID                                 : dvhe
Codec ID/Info                            : High Efficiency Video Coding with Dolby Vision
Duration                                 : 2 h 15 min
Bit rate                                 : 6 759 kb/s
Maximum bit rate                         : 16.8 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.136
Stream size                              : 6.42 GiB (9%)
Default                                  : No
Encoded date                             : UTC 2019-12-07 16:50:07
Tagged date                              : UTC 2019-12-07 18:34:18
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0050 cd/m2, max: 4000 cd/m2

Audio #1
ID                                       : 3
Format                                   : TrueHD / AC-3
Format/Info                              : Audio Coding 3
Format profile                           : TrueHD+Atmos / TrueHD / AC-3
Codec ID                                 : ac-3
Duration                                 : 2 h 21 min
Bit rate mode                            : Variable / Constant
Bit rate                                 : 448 kb/s
Maximum bit rate                         : 5 127 kb/s
Channel(s)                               : Object Based / 8 channels / 6 channels
Channel positions                        : Object Based / Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE
Sampling rate                            :  / 48.0 kHz / 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 3.39 GiB (5%)
Service kind                             : Complete Main
Default                                  : Yes
Alternate group                          : 1
Tagged date                              : UTC 2019-12-07 18:34:18

Audio #2
ID                                       : 4
Format                                   : TrueHD / AC-3
Format/Info                              : Audio Coding 3
Format profile                           : TrueHD+Atmos / TrueHD / AC-3
Codec ID                                 : ac-3
Duration                                 : 2 h 21 min
Bit rate mode                            : Variable / Constant
Bit rate                                 : 448 kb/s
Maximum bit rate                         : 5 433 kb/s
Channel(s)                               : Object Based / 8 channels / 6 channels
Channel positions                        : Object Based / Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE
Sampling rate                            :  / 48.0 kHz / 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 3.54 GiB (5%)
Service kind                             : Complete Main
Default                                  : Yes
Alternate group                          : 1
Tagged date                              : UTC 2019-12-07 18:34:18
DaMacFunkin
Posts: 311
Joined: Tue Oct 30, 2018 4:17 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by DaMacFunkin »

Plex doesn’t support True HD in a mp4.
anhlong1910
Posts: 3
Joined: Mon Dec 09, 2019 2:36 am

Re: Dolby Vision now possible through MP4 Mux.

Post by anhlong1910 »

daddy wrote:
Tue Dec 10, 2019 6:43 am
step by step instruction to build a mp4 with dual layer dv from a multi m2ts disc like Gladiator.
https://www.makemkv.com/forum/viewtopic ... 820#p76820
I'm sorry but I got stuck at step 3 and I have no idea of what he was trying to instruct.
Could you please be more specific what software do I need to download to work with this DolbyVision-muxing here maybe I can try figure out on my own if I know what to download
agentreza
Posts: 6
Joined: Fri Nov 15, 2019 2:06 am

Re: Dolby Vision now possible through MP4 Mux.

Post by agentreza »

Anybody know if we can add a .truehd file ripped from the bluray back into the single layer mp4 with any currently available software?
kylejc86
Posts: 1
Joined: Thu Dec 12, 2019 7:57 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by kylejc86 »

When using EAC3TO to extract the HEVC base layer and enhancement layer from an MKV the resulting file will stutter when played back both through my LG C9 media player and through plex. If i extract these layers using TXmuxer the resulting file plays perfectly.

does anybody know the reason behind this as i am unable to use Grencola's handy tool that automates the process when converting my MKVs.

This does not happen when converting an M2TS using EAC3TO however, all of this is confusing so any help would be appreciated.

This is the file that stutters:
General
Complete name : G:\American Psycho.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp42/dby1/isom)
File size : 54.0 GiB
Duration : 1 h 42 min
Overall bit rate : 75.7 Mb/s
Encoded date : UTC 2019-12-12 15:31:27
Tagged date : UTC 2019-12-12 15:31:27

Video #1
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : hev1
Codec ID/Info : High Efficiency Video Coding
Duration : 1 h 42 min
Bit rate : 67.2 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.338
Stream size : 47.9 GiB (89%)
Default : No
Encoded date : UTC 2019-12-12 15:31:27
Tagged date : UTC 2019-12-12 15:31:27
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 204 cd/m2
Codec configuration box : hvcC

Video #2
ID : 2
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : Dolby Vision, Version 1.0, dvhe.07.03, EL+RPU / SMPTE ST 2086, HDR10 compatible
Codec ID : dvhe
Codec ID/Info : High Efficiency Video Coding with Dolby Vision
Duration : 1 h 42 min
Bit rate : 7 526 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.151
Stream size : 5.37 GiB (10%)
Default : No
Encoded date : UTC 2019-12-12 15:31:27
Tagged date : UTC 2019-12-12 15:31:27
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Codec configuration box : hvcC+dvcC

Audio
ID : 3
Format : E-AC-3
Format/Info : Enhanced AC-3
Commercial name : Dolby Digital Plus
Codec ID : ac-3
Duration : 1 h 42 min
Bit rate mode : Constant
Bit rate : 960 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 701 MiB (1%)
Language : English
Service kind : Complete Main
Default : No
Encoded date : UTC 2019-12-12 15:31:27
Tagged date : UTC 2019-12-12 15:31:27


This is the file that plays perfectly:
General
Complete name : Y:\4K\American Psycho\American Psycho.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp42/dby1/isom)
File size : 54.0 GiB
Duration : 1 h 42 min
Overall bit rate : 75.7 Mb/s
Encoded date : UTC 2019-12-12 18:54:57
Tagged date : UTC 2019-12-12 18:54:57

Video #1
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : hev1
Codec ID/Info : High Efficiency Video Coding
Duration : 1 h 42 min
Bit rate : 67.2 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.338
Stream size : 47.9 GiB (89%)
Default : No
Encoded date : UTC 2019-12-12 18:54:57
Tagged date : UTC 2019-12-12 18:54:57
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 204 cd/m2
Codec configuration box : hvcC

Video #2
ID : 2
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : Dolby Vision, Version 1.0, dvhe.07.06, EL+RPU / SMPTE ST 2086, HDR10 compatible
Codec ID : dvhe
Codec ID/Info : High Efficiency Video Coding with Dolby Vision
Duration : 1 h 42 min
Bit rate : 7 525 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.151
Stream size : 5.37 GiB (10%)
Default : No
Encoded date : UTC 2019-12-12 18:54:57
Tagged date : UTC 2019-12-12 18:54:57
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Codec configuration box : hvcC+dvcC

Audio
ID : 3
Format : E-AC-3
Format/Info : Enhanced AC-3
Commercial name : Dolby Digital Plus
Codec ID : ac-3
Duration : 1 h 42 min
Bit rate mode : Constant
Bit rate : 960 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 701 MiB (1%)
Language : English
Service kind : Complete Main
Default : No
Encoded date : UTC 2019-12-12 18:54:57
Tagged date : UTC 2019-12-12 18:54:57
DaMacFunkin
Posts: 311
Joined: Tue Oct 30, 2018 4:17 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by DaMacFunkin »

agentreza wrote:
Thu Dec 12, 2019 3:33 pm
Anybody know if we can add a .truehd file ripped from the bluray back into the single layer mp4 with any currently available software?
Yes mp4 box will do it, but nothing will play it.


That is the problem.
s0074
Posts: 1
Joined: Fri Dec 13, 2019 4:17 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by s0074 »

Does anybody know what Dolby's Microsoft Store app Dolby Vision Extensions is for?
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