Infuse Pro Audio Decoding Output

Infuse Pro seems to be sending decoded TrueHD and DTS-HD MA 5.1/7.1 as Dolby Digital instead of multichannel LPCM.

The scenario is an AppleTV 4K directly connected to a LG OLED55B7P. The input info shows Dolby Audio for both decoded HD audio codecs.

AppleTV 4K: Best Quality Available
Infuse Pro: Auto

Is this because the LG OLED55B7P supports a maximum of PCM 2.0 input signal?

Welcome to the forum.

The Apple TV is pretty good about detecting the device on the other end of the HDMI cable, so chances are it’s detecting the TV only supports PCM 2.0, and as a result is re-encoding the PCM audio sent from Infuse to Dolby 5.1.

As a test, if you were able to connect the Apple TV directly to your AV receiver it should show multi-channel PCM as expected.

Yes, when its connected to my Denon, 7.1 LPCM is detected. For the use case of directly connected to the LG OLED, I think I would rather set the AppleTV 4K to stereo and have it downmixed rather than re-encode to Dolby Digital 5.1.

When the Apple TV, being connected to a modern AVR, converts TrueHD or DTS-Master to LPCM, is there a loss in sound quality?
Compared to the decoding of TrueHD and DTS-Master being done by the AVR?

No. If the AppleTV is connected to the AVR it will be sent the fully decoded audio track in multichannel LPCM 5.1/7.1. The caveat is you must configure the AppleTV audio for Best Quality Available. The only thing you lose is metadata extensions for object based audio processing, i.e Dolby Atmos and DTS:X.

Okay, this means that I can get the highest possible audio quality when using infuse (but no Atmos). Where the decoding happens does not matter.

Correct.

Hi guys,

I’m using Apple TV 4th gen and Infuse App.

Yesterday I installed my new AV Receiver (Sony Str-dn1080), and all I can see on a receiver screen is Dolby Digital, not PCM. Of course I followed Infuse guidelines on how to set the sound: “Auto” in infuse and “Best Quality Available” on Apple TV settings, but unlike my old receiver which showed PCM, here is not the case. What can be cause of this? Why is infuse not sending PCM or… maybe it is, but AVR is displaying it like Dolby Digital. ? Infuse app should decode TrueHD and DTS MA to PCM, and receiver should display it as PCM. My old Sony AVR showed PCM with the exact same setup as above, but dn1080 shows Dolby Digital. Is it still uncompressed sound?

Vel.

Well, I finally found the source of my problem with a help of a game! Yep, I remembered that Uncharted 4 have LPCM sound-out for its awesome soundtrack, and Auto settings that detects the receiver and options. When I booted it up, I saw that “Device” shows “Auto - TV”, and that the channels were set to 2.0 with no possibility to change to 5.1. I realised that there must be some sort of a setting in AVR that detects modes that TV can handle, and yep. Under HDMI settings - Audio OUT, it was AMP + TV. Of course, when I switched it to AMP only, the problem has disappeared. Infuse now works like it should.

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.