Originally Posted by Reflex-Arc
So, have I been living under a rock? I just discovered that the on-board Youtube app on my C7 sends DD 5.1 via ARC to my AVR for those videos that support it. My ATV doesn't do that. I was under the impression Youtube didn't support 5.1 at all.
There was an LG YouTube app update a couple weeks ago, that, among other things, enabled 5.1 output for content encoded as such.
Like many other lagging-audio streaming services as of late, YT is quietly rolling out DD/5.1 support in stages.
You can test DD+/Atmos here:
P.S. I should also point out that (as otherwise with apps on recent years LG TVs - or some other devices) the YT app/LG TV will re-encode/convert any 2.0 or 5.1 source encoding to DD/DDP 2.0/5.1 depending on what is connected downstream (E-EDID detected) on the ARC channel. You get the "realtime" DD/DDP re-encoding/conversion capability of LG TVs+enabled apps.
PCM/AAC 2.0 becomes DD/P 2.0 if you have a DD or DDP capable ARC-device detected
DDP 5.1 or PCM 5.1 or AAC 5.1 (however its encoded) becomes DD 5.1 if you have just a DD ARC-device connected
So you will find that "PCM 5.1" or "DTS 5.1" encoded videos will playback as DD/DDP 5.1 (depending on ARC device connected)
Keep in mind that while the original source may be 5.1, it may not be DDP or DD encoded even though the LG TV+app ARC output is DDP5.1 or DD5.1 (depending on what you have ARC connected).
This is one of the increasingly tricky aspects of streaming audio: original content codec/channel encoding vs actual output codec/channel encoding - it becomes very difficult to know at times whether you are getting a touched/untouched bitstream output or even whether the original source encoding is accurate/correct as per the label.