[mythtv] Audio distortion issue on Nvidia Shield

[John P Poet]

On Wed, Nov 21, 2018 at 1:28 PM Michael <mythtv at blandford.net> wrote:

> On 11/18/18 2:46 PM, Peter Bennett wrote:
> >
> >
> > On 11/18/18 4:35 PM, Michael wrote:
> >> On 11/13/18 9:06 PM, Michael wrote:
> >>>
> >>> Hi Peter,
> >>>
> >>>
> >>> I was wondering if you had any other thoughts on the issue I was
> >>> having with my shield.
> >>>
> >>>
> >>> I currently have stereo upmix turned off on the shield.    If I play
> >>> videos, randomly I get this screeching noise when starting a video
> >>> or some times after fast forwarding. Rewinding or pausing for 3-4
> >>> seconds often fixes the issue (until a commercial skip, etc ).
> >>>
> >>>
> >>> Tonight I decided to do a little more testing.  I turned on stereo
> >>> upmix and I could essentially ONLY get the screeching sound so I
> >>> obviously turned that back off.   Should it also be off in the
> >>> mythtv settings?
> >>>
> >>>
> >>> I did recently update to the
> >>> mythfrontend-20181102-arm64-v30-Pre-921-g35f94663d71 version w/ no
> >>> change in behaviour.
> >>>
> >>
> >> Just another data point.   I bought another Shield TV this week for
> >> the loft TV.    Very different TV model and same receiver brand ( but
> >> different model ).
> >>
> >>
> >> I started with a new fresh profile and am having the same audio
> >> issues with this one too.
> >>
> >>
> >> I never had issues with either of these TVs or receivers with the old
> >> minimyth2 frontends.
> >>
> >>
> >> Michael
> >>
> >>
> > In Audio setup, under Digital Audio capabilities, do you have anything
> > selected? Disable all of the check boxes there (Dolby Digital, etc.).
> > Also turn off stereo upconvert and set speaker configuration to Stereo.
>
>
> Hi Peter,
>
>
> I played with variations of those capabilities today.  If I enable Dolby
> Digital, I get the weird distortion issue.  Doesn't seem to matter what
> the other options are in terms of generating the noise.  Both receivers
> support Dolby Digital, so I am not sure what the issue might be.
>
>
> I also noticed that even though my receivers support EAC3, TrueHD, and
> DTS HD, those are not selectable in the MythTV menu. The menu items are
> there, but if I scroll up/down, it just cycles between Dolby Digital and
> DTS.
>
>
> Michael


Michael,

Just as another data point, I also have never gotten anything other than
stereo to work via the nVidia Shield.   At this point I have tried a few
different Shields hooked up to a few different receivers, and Dolby Digital
does not work with any of them.  I assume we (MythTV) are not configuration
the audio subsystem correctly, but have not had the time to dig into it.

John
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