Visitor
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33 Messages
4k audio
Why is the audio on the 4K channels coming through as two channel PCM when the audio on the non-4K channel for the same program is showing as Dolby digital?
Visitor
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33 Messages
Why is the audio on the 4K channels coming through as two channel PCM when the audio on the non-4K channel for the same program is showing as Dolby digital?
BIslander
Problem Solver
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694 Messages
12 hours ago
In my testing, the 2 channel issue only happens when the original source material is 2.0. I observed it on MLB Extra Innings baseball games that are 2.0. Also saw it on old programs. Seems like the Xi6 is converting everything to 5.1 PCM regardless of what's in the channels.
I'm looking at the Indiana game in 4K right now. In Auto, I get Atmos/PCM. In Expert, my Xi6 outputs it as 5.1 PCM in a Dolby MAT envelope. When i switch to the regular Fox HD channel, it's DD+ 5.1 in Expert.
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BIslander
Problem Solver
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694 Messages
11 hours ago
@user_x1npns Have they explained anything ... or just asked you to report things?
They, of course, have access to an Xi6 and can see what it does. And there must be technical specs.
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user_x1npns
Visitor
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33 Messages
3 hours ago
Following is a photo of a list of the current audio inputs by type of channel. Sorry it’s an analog list! 😂
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user_x1npns
Visitor
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33 Messages
3 hours ago
I think this is self explanatory.
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BIslander
Problem Solver
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694 Messages
2 hours ago
Thanks @user_x1npns
@XfinityJustinM Please add these comments to the engineering team report.
That list matches what my Xi6 outputs, too. I would add that on Auto, everything is Dolby MAT, not standard MultiCh In 5.1 PCM. Music Choice and old programs like Andy Giffith on MeTV arrive from the Xi6 as 5.1, but only have sound in the L/R channels. You can get sound to other speakers using MultiCh Stereo but not regular upmixers like Dolby Surround since the arriving source is flagged as already being 5.1.
On Expert, we differ slightly on 4K sources. My Xi6 outputs standard 5.1 PCM, not MAT, but the only sound is in the L/R channels, essentially acting like 2.0 which can't be upmixed. Also, I get a DD+ 2.0 input on MeTV, which plays all those old TV shows. It acts the same as Music Choice.
@XfinityJustinM My receiver is a Denon X3800H in a 5.1.4 Atmos layout. @user_x1npns say
s he has an Atmos capable Yamaha AVR configured in 5.1 without height speakers.
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BIslander
Problem Solver
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694 Messages
16 minutes ago
Sundance is a channel that sends DD+ 5.1. It upmixes stereo source content itself so that there's sound in the center and surround channels. MeTV does DD+ 2.0 and the AVR has to upmix, which it can do correctly in Expert. But, in Auto, the Xi6 converts the original track to Dolby MAT 5.1 PCM without upmixing and you get a 5.1 transmission with the only sound in the L/R channels.
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