[mythtv] Audio distortion issue on Nvidia Shield
Michael
mythtv at blandford.net
Mon Sep 24 02:41:46 UTC 2018
On 9/19/18 11:45 AM, Peter Bennett wrote:
> I tried the latest build on my surround system and Dolby Digital works
> fine. I am running version 7.0.2 of the shield experience.
>
>
> On 09/18/2018 11:45 PM, Michael wrote:
>> My basic configuration is the shield is plugged into a yamaha
>> receiver and the receiver then drives the TV. Speaker config is 5.1
>>
>>
>> Under the shield settings for video/audio advanced:
>>
>> Surround auto
> I found before that I had to set Surround to "Always" for it to work.
> However Surround "Auto" now works for me, but I prefer to leave it as
> "Always".
>>
>> stereo upmix off
>>
>> fixed volume yes
>>
>>
>> In MythTV:
>>
>> Dolby Digital yes
>>
>> DTS yes
>>
>> EAC3, TrueHD, and DTS HD are not selectable and I can't even move to
>> them - not sure why as my receiver supports all three
>>
>>
>> Speaker config is 5.1
>>
>> Upconvert stereo to 5.1 is yes, but I tried both ways
> Preferably disable this.
>>
>> Use internal controls no
>>
>>
>> Even going into the test audio section can generate the crackle noise.
>>
>> Oddly, When just testing a single speaker like the left front, the
>> loud crackle seems to come from the center speaker. It doesn't
>> matter which speaker is tested, the large crackle comes from the
>> center ( I believe ). If I test all, I get the loud crackle and
>> then it proceeds around the other speakers without issue.
>>
>>
>> Oddly, this configuration was all working fine until a week ago or so
>> and the only change I can think of was the Shield update.
>>
> Which update was this? I just received notification today of 7.1
> update but I did not apply it yet. I am still on 7.0.2.
>
> I did find that setting fixed volume off on teh shield prduces the
> crackle if I adjust volume, so I always leave it as fixed volume.
>
> My setup is shield to TV, and TV digital out to receiver. My receiver
> does not support hdmi, but tjhe audio gets passed through to the
> optical output. The receiver confirms via display that it is decoding
> Dolby Digital.
>
Hi Peter,
I spent some time playing with this tonight. I tried all of the
settings you mentioned about and I still am having the crackly sound
from the center regardless of what speaker is actually playing the the
start of a video or after seeking forward.
I am at a loss. How can I get the logs from the frontend to see if
there is something obvious?
The update I was referring to was the 7.1 update. I applied it around
7-10 days ago which is about the time this started. Unfortunately, I
can't say for certain thats when it started, but its the only thing I
can think of that changed.
Michael
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