Mailing List Archive: MythTV: Users

Re: Strange Audio Problem 0.25 [SOLVED]

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jraymyth at gmail

Jun 13, 2012, 7:51 AM

Post #1 of 3 (291 views)
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Re: Strange Audio Problem 0.25 [SOLVED]

On Wed, Jun 13, 2012 at 3:02 AM, Jean-Yves Avenard <jyavenard [at] gmail> wrote:
> Hi
>
>
> On 13 June 2012 13:43, jr <jraymyth [at] gmail> wrote:
>
>> Hmmm. This is confusing. Using 7 in that line resulted in a no
>> device found error. But it got me wondering, so I went thru all of my
>> listed devices with DEV=7, and found one that works.
>>
>> ALSA:dmix:CARD=NVidia,DEV=7
>
> I think you can safely ignore whatever Igor has suggested, none of his
> suggestions make any sense, and even less so with any modern linux
> distributions
>
> From looking at the original logs you have provided:
>
> The audio device you have connected doesn't support AC3/DTS, only stereo PCM.
> So yes, you would hear audio because the audio test will only try stereo.
> Here you're trying to play AC3 which your audio device (TV) doesn't support.
> You have configured your machine and enable AC3/DTS passthrough.
> Uncheck those. Keep audio as Stereo.
>
> As you're running a very recent version of ALSA, you can see what your
> audio device supports in the help description at the bottom of the
> screen when you move the cursor to the audio device name (here
> ALSA:hdmi:blah
>
> If you believe your TV does support AC3/DTS (which would be very
> surprising but who knows...)
>
> It could be a problem I've seen with very recent version of ALSA if at
> any time you put your PC to sleep and turned it back on before the TV
> was on. The ELD value isn't read properly and ALSA disable some audio
> options
>
> Try rebooting your PC, making sure the TV/amplifier is on before the PC reboot.
>
> Jean-Yves
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://www.mythtv.org/mailman/listinfo/mythtv-users

You are dead on. I assumed (for whatever reason) that since those
boxes were disabled, that their state of default check-ed-ness would
be ignored. That is clearly not the convention. So, I switched to a
device that enabled E-AC-3, TrueHD and DTS-HD, unchecked them, and
then went back to my original ALSA:hdmi:CARD=NVidia,DEV=1 -- And
voila! Sound.

Thank you both for your efforts.
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jyavenard at gmail

Jun 13, 2012, 8:14 AM

Post #2 of 3 (287 views)
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Re: Strange Audio Problem 0.25 [SOLVED] [In reply to]

Hi

On Wednesday, 13 June 2012, jr wrote:

>
> You are dead on. I assumed (for whatever reason) that since those
> boxes were disabled, that their state of default check-ed-ness would
> be ignored. That is clearly not the convention. So, I switched to a
> device that enabled E-AC-3, TrueHD and DTS-HD, unchecked them, and
> then went back to my original ALSA:hdmi:CARD=NVidia,DEV=1 -- And
> voila! Sound.
>
>
>
You're saying that the AC3/DTS checkboxes were disabled, yet it would have
tried to play AC3??

That's just not possible. And from the original logs you provided, AC3 and
DTS settings would have been enabled

Any of the digital audio user settings are hints, they work as an AND to
whatever your device actually support. So if the settings were greyed out,
there is no way whatever user configuration is used will have an impact (as
0 AND 1, is always 0)

Also, the AC3, DTS are never checked by default, unless the user manually
checked them.

jraymyth at gmail

Jun 13, 2012, 10:15 AM

Post #3 of 3 (281 views)
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Re: Strange Audio Problem 0.25 [SOLVED] [In reply to]

On Wed, Jun 13, 2012 at 11:14 AM, Jean-Yves Avenard <jyavenard [at] gmail> wrote:
> Hi
>
>
> On Wednesday, 13 June 2012, jr wrote:
>>
>>
>> You are dead on. I assumed (for whatever reason) that since those
>> boxes were disabled, that their state of default check-ed-ness would
>> be ignored. That is clearly not the convention. So, I switched to a
>> device that enabled E-AC-3, TrueHD and DTS-HD, unchecked them, and
>> then went back to my original ALSA:hdmi:CARD=NVidia,DEV=1 -- And
>> voila! Sound.
>>
>>
>
> You're saying that the AC3/DTS checkboxes were disabled, yet it would have
> tried to play AC3??
>
> That's just not possible. And from the original logs you provided, AC3 and
> DTS settings would have been enabled
>
> Any of the digital audio user settings are hints, they work as an AND to
> whatever your device actually support. So if the settings were greyed out,
> there is no way whatever user configuration is used will have an impact (as
> 0 AND 1, is always 0)
>
> Also, the AC3, DTS are never checked by default, unless the user manually
> checked them.
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://www.mythtv.org/mailman/listinfo/mythtv-users
>

Ok. I went and tested out what you said and you are right. Turning a
greyed checkbox back on did not affect the sound. Dolby Digital and
DTS are the only two setting that could have come into play.
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