HDMI ARC does not have enough data capacity to support the transmission of Dolby Atmos content that is encoded using Dolby TrueHD, which is the format used on Blu-ray Disc and UHD Blu-ray Disc. To support Dolby Atmos over HDMI ARC for Blu-ray Disc playback, a television has to decode Dolby TrueHD and transcode it to Dolby Digital Plus before output. Today, this feature is only supported in televisions that have native Dolby Atmos decoding."
I saw this small thread as well. Someone is having the same issue with an LG Nanocell TV. So its not even just the OLED's that have the issue. Here is the response from the LG person:
Our TVs are eARC-ready, but external devices may
not be – due to the fact they don’t have the necessary firmware to support eARC
– even if they are recognized as eARC devices when connected to the TV. Audio
pass-through does help to reduce any delay of audio output.
currently support 2.0 channels for PCM, while multi-channel support is offered
for Dolby Atmos and DTS. Multi-channel support for PCM will be provided via a
software upgrade early in 2020.
And here is my response to that:
@JamalofLG I have this
same issue with a C9 OLED tv. And I have read countless other threads where
people have the same issues happening on their B/C/E 7/8/9 OLED TV's, even
before eARC was an option. I understand that most soundbars are not eARC yet
(although I have no idea why LG would release an eARC compatible TV, without a
corresponding eARC compatible soundbar to take advantage of it). However,
eARC is only required for lossless audio (Dolby TrueHD in this case). ARC is
completely capable of handling anything "lossy" (Dolby Digital Plus
or lower), even lossy Atmos.
In my situation, when I have my Xbox One hooked up to the TV,
and then ARC to the soundbar, there is an audio delay when playing ANYTHING
Dolby. Even just navigating the menus, the sound that chimes when you
move from one icon to the next or when typing on the keyboard is delayed.
I am sure that chime/click sound is not being output in Dolby TrueHD. And
this is with the Xbox being set to just regular Dolby Digital, not even
Atmos. I even put in a DVD from 2004 with regular Dolby Digital 5.1, and
there was STILL a slight delay in audio (although not as severe as running a
game/movie in Atmos). You can't tell me that HDMI ARC can't handle the
audio of a 15 year old DVD. Every "level" of Dolby gets a more
significant delay than the last, from Dolby Digital, to DD+, to DD+
Atmos. Setting the TV audio to Pass-through does nothing to improve this
This is NOT an eARC issue. This is an issue with LG
TV's being able to process/pass-through ANY Dolby Signal.
@DJ_GLiTCH have you had any luck hearing back from LG at all?
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