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The Sonos app doesn’t show “audio in”; it’s just blank on the “Sonos System Info” screen even though there is audio playing.

My source is an Apple TV 4K, connected to an LG OLED TV with audio passthrough enabled, and my Sonos Arc is connected to the TV’s eARC port.

When I had a Sonos Arc in the past (I recently moved and got a new one), and was using the “old” app, the input type would show on the “Sonos System Info” screen. Is this just another “bug” in the new app, or something else?

Thank you in advance for your insight.

I was having the same issue. Found a Reddit post that noted the info is on the now playing screen, which is actually way better...

Without the audio in information now I am not able to determine the Dolby ATMOS is in DD+ or True HD format for the now playing screen only shows Dolby ATMOS

If it’s a streaming source then DD+ almost universally used.

The one exception I know of is Bravia Core, which streams at 80Mb and uses lossless audio from both Dolby and DTS for some of their 4K streams when purestream is configured.
True-HD is upto 18Mbit bandwidth, which is why most streaming sources don’t use it. DTS-HD MA is even higher at 26Mbit, which is more than some video streaming platform use for video and audio combined.

The labelling as only Dolby ATMOS is most likely because that is how Dolby brand it, regardless of whether it is DD+ or TrueHD audio delivery.

Similar to DTS-HD is the DTS branding for both DTS-HD HR & DTS-HD MA audio delivery.

If it’s a streaming source then DD+ almost universally used.

The one exception I know of is Bravia Core, which streams at 80Mb and uses lossless audio from both Dolby and DTS for some of their 4K streams when purestream is configured.
True-HD is upto 18Mbit bandwidth, which is why most streaming sources don’t use it. DTS-HD MA is even higher at 26Mbit, which is more than some video streaming platform use for video and audio combined.

The labelling as only Dolby ATMOS is most likely because that is how Dolby brand it, regardless of whether it is DD+ or TrueHD audio delivery.

Similar to DTS-HD is the DTS branding for both DTS-HD HR & DTS-HD MA audio delivery.

Thanks for the explanation of the format types but I already understood the audio codecs. I was using the info to confirm I have changed DVD player to output Dolby True HD correctly and some DVDs say Dolby ATMOS but don’t label DD+ or True HD therefore I would look in the info section of the SONOS app before. Most of the time I can notice which codec is used by the audio quality sound but some audio sources I can’t tell the difference. 

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