Dolby Vision now possible through MP4 Mux.

[susanstone2022]

PS: I just asked Dolby and sent them a bunch of test files about CMV4.0 missing level 8 and L2 trim offset ignored in tv-led.
Let see what they say.

Thank You! Its super weird that something like this escapes in testing. Is there actually any way to correctly play CMV4.0 files? The internal player is CMV4.0 and the image was much darker, i doubt that was the intended mastering they wanted..

Regarding the setup im using, do you think i need to change anything?

Not only should we ask Dolby, but also ask LG, Sony, etc. Current behaviors of playback devices and display devices does not make sense to me.

[RESET_9999]

Regarding the setup im using, do you think i need to change anything?

No , it sounds right but you should try DV MKV with kodi on your C2, it works great on my end (PGS and SRT).
https://kodi.wiki/view/HOW-TO:Install_Kodi_for_webOS

[RESET_9999]

Not only should we ask Dolby, but also ask LG, Sony, etc. Current behaviors of playback devices and display devices does not make sense to me.

Well, unless you are new to this DV thing, we found out quite early that DV is a total mess filled with bugs.

[susanstone2022]

Not only should we ask Dolby, but also ask LG, Sony, etc. Current behaviors of playback devices and display devices does not make sense to me.

Well, unless you are new to this DV thing, we found out quite early that DV is a total mess filled with bugs.

yeah. I have been following the thread. maybe consumers should start a class action suit against Dolby, LG, Sony, etc so they may take the mess more seriously.

[chros]

thanks for confirming, it makes sense.

What is the internal config for tmax in our C2

I have added DoVi section to all the available settings docs.
VSVDB is the EDID value.

[skull88]

Not only should we ask Dolby, but also ask LG, Sony, etc. Current behaviors of playback devices and display devices does not make sense to me.

Well, unless you are new to this DV thing, we found out quite early that DV is a total mess filled with bugs.

yeah. I have been following the thread. maybe consumers should start a class action suit against Dolby, LG, Sony, etc so they may take the mess more seriously.

How would that work? "Dolby Vision looks good, but not accurate on all devices, give me money back!!" Lol. Joking aside, it will never work as you cannot prove you're paying any specific unavoidable costs for Dolby Vision support when you purchase a device, and even if you could argue that you are, someone like Apple will state that they do support it, and it plays back fine. Dolby's out is that it's on the creators to follow their "guidelines" and they cannot force manufacturers to strictly adhere to Dolby specs, they pay a license fee to implement as they see fit. Even in the insane universe in which somehow the lawsuit is won, each participating individual will get like pennies or a dollar or something per device they bought, as LG, Sony, and others will argue that they include Dolby Vision as a gesture of goodwill to their consumers and it's not built-it into the price of any particular TV model beyond some tiny fraction based on economies of scale and perpetual Dolby licensing. If you want a more valuable lawsuit or petition to improve PQ for every consumer in the world of any decent TV, it would be to require TV manufacturers to include guided calibration apps or self-calibration or AI-based setup programming based on the room's conditions in each TV set they ship out of the box! Imagine living in a world like that, haha.

[RESET_9999]

I have added DoVi section to all the available settings docs.
VSVDB is the EDID value.

that's great info. thanks a lot man.

[aboulfad]

I have added DoVi section to all the available settings docs.
VSVDB is the EDID value.

Were those values retrieved using bscpylgtv command or by extracting the default DV config files from the C2 TV firmware?
As discussed prior, I think @quietvoid commented that the EDID Tmax values transmitted to an hdmi external device are used for “detection/player led” and TV led uses those internal config values.

The C2 default config file entry is same to what you’ve captured in the docs. It may not or is not the same as the EDID VSVDB value transmitted over the wire. Here’s my findings for my older E7, where the EDID VSVDB Dolby Tmax is way lower (350) than my TV’s internal DV Tmax (~750). I don’t have any Vertex to confirm this, I used an rpi5 connected to the TV & a command to get the EDID.

[RESET_9999]

So, LG TV's Kodi still sucks. I corrected the delay and now I got the correct sync when played on PC or Zidoo. When played through the Kodi Plex add-on, there is a slight delay on the video, I can notice a 2-300ms of delay. Playing the same file directly into Kodi, I get a delay in sound. It's annoying as hell getting DV MKVs to play properly on the LG...

So far I've only watched movies/TV with EAC3 audio and it is always in sync but last night I watched something with AC3 audio and the audio is indeed OOS 300-400MS. Tried other AC3 files and got the same problem then converted the audio to EAC3 and it fixed the issue.

[RESET_9999]

Hello @RESET_9999

My setup is the same as yours (x800m2 direct to the C2) but I am facing quite a strange scenario with two different DV movies.

Yesterday i was watching the new Wonka movie in the internal player of the C2 because the movie is cropped (3840x1604). Imediately i noticed that the movie was dimmer than normal levels. When i opened the same file in the x800m2, i noticed it was playing with a brighter image, albeit with grey bars.

Did some cmv4.0 test files for Wonka:

cmv4.0 removed P5: https://drive.google.com/file/d/1cbEXSO ... sp=sharing
cmv4.0 removed P8: https://drive.google.com/file/d/1t-xFto ... drive_link
cmv4.0 original P5: https://drive.google.com/file/d/1ZAUusI ... drive_link
cmv4.0 original P8: https://drive.google.com/file/d/1CRDuTM ... drive_link

I'm not home and can't test on my C2 but remotely with teamviewer, and using the Windows Energy player, I can see how the CMV4.0 without the L2 positive lift is noticeably darker.
I expect the same on my C2.
see this, CMV2.9 with trims vs CMV4.0: https://slow.pics/c/johVT1ao
and now CMV2.9 without trims vs CMV4.0: https://slow.pics/c/TKTvPkau

[valington]

I have added DoVi section to all the available settings docs.
VSVDB is the EDID value.

that's great info. thanks a lot man.

Reset i m doing BDMV DOLBY VISION from mkv 7profile dolby vision with your script , is it true dolby vision which i got in bdmv with your script ?

[azreil24]

So far I've only watched movies/TV with EAC3 audio and it is always in sync but last night I watched something with AC3 audio and the audio is indeed OOS 300-400MS. Tried other AC3 files and got the same problem then converted the audio to EAC3 and it fixed the issue.

Gotcha. I will test when I get home in a few days. Thanks for the find. Weird thing is that trying to re-sync the audio in Kodi doesn't help.

[RESET_9999]

Reset i m doing BDMV DOLBY VISION from mkv 7profile dolby vision with your script , is it true dolby vision which i got in bdmv with your script ?

If you demux ST P7 mkv and then mux to BDMV the BL and EL, yes.
If you just create a BDMV without demuxing the layer from a ST-P7, probably not?

[valington]

Reset i m doing BDMV DOLBY VISION from mkv 7profile dolby vision with your script , is it true dolby vision which i got in bdmv with your script ?

If you demux ST P7 mkv and then mux to BDMV the BL and EL, yes.
If you just create a BDMV without demuxing the layer from a ST-P7, probably not?

Yes i m demux st p7 mkv and then mux to bdmv the bl and el , thank you RESET

[RESET_9999]

Ok, I think I know what's going on with CMV4.0.

First, Dolby confirmed that L8 is not generated and must fully come from the colorist and only L2 is generated automatically and gets updated through L8 to L2 math. And 600-100nits L8 are not needed/requested most of the time.

Secondly, the 100nits L8 has an effect during DV playback and produce a similar/close effect and image to CMV2.9 with L2 trims. On Windows Energy player or movies and tv app, in HDR10 the active 100nits L8 trim always has an effect but on the C2, the 100nits L8 trim only has an effect if it's alone (without L8 600nits or 1000nits trim). Same behavior in cmv2.9. L2 100nits alone is used but when there are trims, it is not used on the C2.

So in Wonka, there is no active L8 100nit trim and the image is noticeably darker on cmv4.0 device than on 2.9 devices when there is L2 trims.
In Aquaman, there is an active L8 100nit trim and the image looks similar on both 4.0 and 2.9 devices.

So perhaps, Wonka and the ones without 100nits L8 were done in cmv2.9 and upconverted to 4.0 for streaming requirements? or maybe the colorist just was lazy and did not make trims?? idk

I've added the test files in my googledrive: https://drive.google.com/drive/u/1/fold ... fx6vRYDEfs