Force ATV4K to output LLDV and Dolby Atmos - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 1 Old 01-07-2020, 05:53 AM - Thread Starter
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Question Force ATV4K to output LLDV and Dolby Atmos

Hello everyone,

TL;DR: I want to force the ATV4K to output LLDV video and Dolby Atmos sound.

Here's why:

Background
My TV is an LG OLED E7 that is both Dolby Vision and Dolby Atmos capable.
I mostly watch Netflix using the ATV4K.
I rely on my TV's internal soundbar to play the sound at the moment, but I intend on purchasing a proper Dolby Atmos sound system later.

Objective
I would like to setup a Philips Hue Ambilight using the Hue Sync Box.
While the Ambilight is running, I still want to enjoy a Dolby Vision image and a Dolby Atmos sound.

Problem
The Hue Sync Box is not capable of processing Dolby Vision signals.
According to Philips: the highest quality it is able to process is HDR10.

First idea
Alright, I'm gonna split the signal in two, and convert one branch to HDR or SDR and feed that branch to the Hue Sync Box.
But as I found out, there is no device in the world that can convert DV to HDR or SDR.

Second idea
It seems that the Hue Sync Box is unofficially able to process LLDV.
Indeed the Sony TVs only support LLDV rather than real DV, and the XBox always outputs LLDV rather than DV.
And for both devices, people on Reddit got the Hue Sync Box to work with Dolby Vision content.
https://www.reddit.com/r/Hue/comments/dssfu5/hue_sync_box_with_dolby_visionatmos_working/
https://www.reddit.com/r/Hue/comments/dsls4e/xbox_one_x_dolby_vision_running_with_hue_hdmi/
Moreover LG TVs from 2017 onwards support LLDV and recognize it as DV.
So knowing all this, I bought a Dr HDMI 4K from HDFury to spoof the EDID the ATV4K sees into SONY A1 LLDV.
Now, I'm able to send LLDV to the TV through the Hue Sync Box.
The latter is able to process the colors correctly, the former recognizes the video input as Dolby Vision.
Hurray?
Well unfortunately two new problems surfaced.

New problems
1. Apparently the Sony A1 TV is not Dolby Atmos capable, so the ATV4K does not bother outputting Dolby Atmos.
2. Apparently the Hue Sync Box cannot handle the LLDV video I'm sending when it's in 4K resolution.

So this is where I give up and turn to the experts in this forum.
How may I solve the above-mentioned 2 issues?
For issue #2 , I was thinking of replacing my DrHDMI with a Diva to split the video stream in 2 branches:
- An untouched LLDV stream for the TV
- An HDR or SDR downgraded stream for the Hue Sync Box.
That way I will still be able to see 4K LLDV on my TV and my Hue Sync Box will receive a color accurate stream it can handle.

For issue #1 though, I am clueless. I guess I need an EDID that pretends being able to handle LLDV and Dolby Atmos?
Does such a thing exist?
Valentin Mercier is offline  
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Reply High Dynamic Range (HDR) & Wide Color Gamut (WCG)

Tags
atmos , diva , edid , hue sync , lldv

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