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  April 8, 2018 - 6:00am
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@James Hi, I wanted to bring another similar issue to your attention, even though it's not specifically DTS related. I've noticed whenever I playback a ripped DVD (in MKV) with a low bitrate Dolby 5.1 track, and the setting is set to auto. The channels get switched. For example: the center channel content plays out the front right speaker instead of center. HD audio to PCM doesn't seem to have this issue. Also, switching back to passthrough would solve the issue, I haven't tried it as of TVOS 11.3. I Also can't tell you if it's InFuse, or the Apple TV at fault either, because the same content one streamed to the Sony UBP-X800 plays normally, even when the unit is set to output in PCM vs Bitstream. FYI I never tried a standard DTS track in this setup so I can't tell you if the channels would be switched for DTS. I just know it happens with standard Dolby digital 5.1 to PCM played in InFuse. iTunes and other streaming channels such as Netflix, VUDU, etc don't have the issue.

  April 9, 2018 - 1:38am
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Could you please open a separate thread for your problem as this has nothing to do with the passthrough issue that's discussed here.

  April 9, 2018 - 3:42am
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  Taucheranzug wrote:

Could you please open a separate thread for your problem as this has nothing to do with the passthrough issue that's discussed here.

How is that done on this forum? starting a new thread. Would it be better if I went directly to support as well? I have a a couple of minor issues in addition to the issue being discussed here, and would like to put them under an umbrella because they are all audio related. that's why I asked here because while it's not DTS specific it's still an issue with passthrough vs auto, and the third issue is not getting 5.1 over airplay, even when enabled.

  April 9, 2018 - 3:54am
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Just click here:
https://firecore.com/forum/tvos-new-apple-tv

Then click on "New Post". Not exactly rocket science....!

  April 9, 2018 - 4:05am
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  Taucheranzug wrote:

Just click here:
https://firecore.com/forum/tvos-new-apple-tv

Then click on "New Post". Not exactly rocket science....!

Thank you, done. Every forum is different and I didn't see the new Post option simply going back to the main forum page. The link helped.

  April 9, 2018 - 6:58am
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Feels like a double whammy for me - For me to get Dolby Vision working on my Apple TV for my Sony A1 I needed to update my Apple TV to tv0S 11.3 and then it breaks DTS passthrough on Infuse, hope this is sorted out quick by Apple.

  April 9, 2018 - 8:43am
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Seems there are many users here who use their TV's optical out or HDMI via ARC to get audio into the receiver. One workaround for now is to try and switch the TV's audio out (SPDIF or ARC) to PCM, which most TVs should support. The default setting is passthrough.

  April 9, 2018 - 8:48am
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  nickpicker wrote:

Seems there are many users here who use their TV's optical out or HDMI via ARC to get audio into the receiver. One workaround for now is to try and switch the TV's audio out (SPDIF or ARC) to PCM, which most TVs should support. The default setting is passthrough.

You are correct in TVs supporting PCM output, however usually it's just Stereo PCM, and not multichannel. Optical doesn't have the bandwidth for HD audio OR Multi-channel PCM, and neither does the current ARC specifications. That's the one major downside to the Apple TV. It only supports PCM, or Dolby 5,.1 and stereo as it's native audio formats. That's why I suggested in my first post to have alternative devices available. Chances are if you're using DTS HD, or DTS anything or Dolby TrueHD, you're not using iTunes content, and would be just as easy to use a working alternative device until this issue is sorted out.

  April 9, 2018 - 12:25pm
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Same issue after the 11.3 update, so if I set to Auto and BQA on ATV4k, what is being sent when playing a dts or a truehd file, my current receiver is denon 3300

  April 9, 2018 - 12:30pm
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  surfer369 wrote:

Same issue after the 11.3 update, so if I set to Auto and BQA on ATV4k, what is being sent when playing a dts or a truehd file, my current receiver is denon 3300

If you have things set to auto, it's most likely decoding the DTS / TrueHD track internally and passing it as LPCM Multi if your receiver supports it.

  April 9, 2018 - 1:48pm
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So my denon receiver shows as PCM, not only for Infuse but for all other apps too on teh apple tv 4k. So you are saying LPCM is different than PCM and is it the same as DD plus or DTS or TruHD.

Whats the difference between auto and passthrough

  April 9, 2018 - 2:10pm
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  surfer369 wrote:

So my denon receiver shows as PCM, not only for Infuse but for all other apps too on teh apple tv 4k. So you are saying LPCM is different than PCM and is it the same as DD plus or DTS or TruHD.

Whats the difference between auto and passthrough

LPCM simply stands for Linear PCM. Yes, it's the same thing. PCM is the uncompressed state of any audio stream. You are seeing PCM for everything, because when the Apple TV is set to Best quality for Surround, everything is sent as PCM for best quality. Especially if you're using a direct HDMI connection between the receiver and Apple TV.

DTS, Dolby are all different containers and formats of uncompressed audio. DTS MA, and Dolby TRUEHD that is. So when InFuse reads a lossless DTS/ Dolby track and passes it as PCM, no quality is lost because it stays uncompressed. Where you loose quality is with compressed audio such as AAC, and standard DTS / Dolby digital. When your receiver shows a light or displays a name, it's simply showing you which format the audio stream is in. Even with the standard and HD codecs, PCM is at the core of each. PCM is simply how sound is produced. FYI: PCM stands for Pulse Code Modulation.

  April 10, 2018 - 5:07am
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After 11.3 and setting Auto / Best Audio Available I get audio / video sync lag. Video doesn't sync with the audio that well anymore. Does this happen to anyone else? Is this a separate problem? I'm guessing it's related to the Apple TV doing the audio processing, but not sure.

  April 10, 2018 - 5:17am
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...no, I can't confirm this, at least not with ATV set to "Dolby Digital 5.1" in "Best Audio" and Infuse set to "Auto" (which are both my settings as my receiver can't handle multichannel PCM streams via TOSLINK).

I have at least watched a dozen movies / TV episodes with these settings and though I'm quite unhappy with the now-missing DTS possibility, I can at least say that the conversion to DD 5.1 (where necessary) works ok without any lags between audio and video.

  April 10, 2018 - 6:17am
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  raquo wrote:

After 11.3 and setting Auto / Best Audio Available I get audio / video sync lag. Video doesn't sync with the audio that well anymore. Does this happen to anyone else? Is this a separate problem? I'm guessing it's related to the Apple TV doing the audio processing, but not sure.

im seeing the same stuff here. video/voice not in sync when changing... Smile

  April 10, 2018 - 6:20am
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...only with multichannel LPCM or with DD too?

  April 10, 2018 - 6:23am
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LPCM, haven't tried with DD.

  April 10, 2018 - 6:24am
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  Taucheranzug wrote:

...only with multichannel LPCM or with DD too?

'
LPCM. my tv shows LPCM but i havent tried setting the Apple tv to Dolby digital yet.

  April 10, 2018 - 6:31am
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Which version of the Apple TV Are we talking about here? I have one of each of the two current generations. The 4, is the one with the direct HDMI connection, and the 4k is the one that goes through the TV and out optical. The 4 doesn't seem to have any sync issues that I've noticed with best quality and auto set in the respective settings.

  April 10, 2018 - 6:35am
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Regular Apple TV 4 with HDMI to an Onkyo receiver.

  April 10, 2018 - 8:21am
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I just wanted to add that after doing some testing this morning with a clean restore and install of TVOS 11.3 to my Apple TV 4k, it would appear the passthrough option in Infuse is COMPLETELY broken. Dolby 5.1 doesn't work either and returns loud static like a reel to reel sound. The only way to get audio from Infuse that's multi channel seem to be setting the Apple TV to Dolby 5.1, and Infuse to auto. (especially for those who can't do a direct HDMI connection between the Apple TV, and receiver. So I think this thread is incorrectly named and should in fact be labeled Passthrough is broken as of 11.3 since I just demonstrated here it's not Just DTS that won't pass through.

  April 10, 2018 - 8:46am
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The thread title doesn't say anything about passthrough, it just says that you can't get DTS sound using Infuse anymore and that is totally correct. But you're right in general - passthrough doesn't work at all since 11.3, so whatever sound stream you might have now, the only possible Infuse option is "Auto" which means that either Infuse or the ATV itself takes care of the input sound and sends it to the receiver/TV according to the "Best Audio" setting.

  April 10, 2018 - 9:08am
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  Taucheranzug wrote:

The thread title doesn't say anything about passthrough, it just says that you can't get DTS sound using Infuse anymore and that is totally correct. But you're right in general - passthrough doesn't work at all since 11.3, so whatever sound stream you might have now, the only possible Infuse option is "Auto" which means that either Infuse or the ATV itself takes care of the input sound and sends it to the receiver/TV according to the "Best Audio" setting.

Well, that was my point, without passthrough working, you either get dolby or pCM now. On systems with a direct HDMI connection technically everything is sent as PCM regardless of the source. So, with either InFuse set to passthrough, or the Apple TV set to Dolby digital 5.1, and InFuse set to auto that's the only way to get specific audio .

What I've observed is when InFuse was working, the passthrough setting worked independently of whatever the ATV was set to.

This is either a bug on Apple's part, or it's their attempt to lock down the system and everything has to go by their standards now.

What Infuse really did was give people a bitstream option. It's no different then setting a blu-ray player to decode internally and send everything as PCM vs setting it to bitstream and letting the receiver do the4 decoding. With this said, Apple is going to HAVE to do bitstream if they intend to support ATMOS natively on the Apple TV 4k. ATMOS doesn't work through a PCM stream.

  April 10, 2018 - 10:30am
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  iFrog wrote:

I just wanted to add that after doing some testing this morning with a clean restore and install of TVOS 11.3 to my Apple TV 4k, it would appear the passthrough option in Infuse is COMPLETELY broken. Dolby 5.1 doesn't work either and returns loud static like a reel to reel sound. The only way to get audio from Infuse that's multi channel seem to be setting the Apple TV to Dolby 5.1, and Infuse to auto. (especially for those who can't do a direct HDMI connection between the Apple TV, and receiver. So I think this thread is incorrectly named and should in fact be labeled Passthrough is broken as of 11.3 since I just demonstrated here it's not Just DTS that won't pass through.

Good suggestion - thread title has been updated. Smile

Infuse 6 for iOS and Apple TV is now available!

  April 10, 2018 - 5:16pm
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Yeh came here looking for a reason why it changed all of a sudden... thanks Firecore for the thread. Hopefully a fix soon

My settings: ATV 4K->HDMI->TV Optical out

Set Apple audio to Dolby 5.1 (instead of best available) and of course, Auto in Infuse...

Works fine for most of my stuff... except DTS haha

  April 11, 2018 - 5:52am
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good afternoon. why at the last update in the choice of audio tracks the DTS-HD disappeared and writes DTS? Do I understand correctly that with LPCM the sound quality became worse because now DTS is in the choice of audio track?

  April 11, 2018 - 9:01am
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I've tried the workaround, but do not get any sound from the surround right speaker (all other speakers are working fine, it's a 5.1 system with Onkyo receiver). Any thoughts?

  April 11, 2018 - 9:23am
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...which workaround did you try??

  April 11, 2018 - 10:24am
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I think the new word “Fix” in the title is misleading! It is not fixed but merely a workaround.

  April 11, 2018 - 12:00pm
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  Taucheranzug wrote:

...which workaround did you try??

Setting Apple TV to Best Quality Available and Infuse to Auto, as recommended.