[mythtv-users] Corrupt audio with i8x0 (sis7012)

[darco]

I don't know if this was the problem you were having, but I figured 
that someone out there might find this info useful.

The sound on my pundit sounded awful until a few days ago, when I took 
at look at my mixer settings via alsamixer.

There were three interesting "inputs", all seemed to be named "3D 
Contr", and all were up all the way. I turned all three of these 
completely off. Instantly the sound was MUCH clearer, without any 
distortion.

I'm guessing that the "3D Contr" stuff is for sending 5.1 codes in the 
audio, and was designed to be interpreted by a 5.1 stereo system. Not 
having a 5.1 system, it sounded horrid.

I don't know if this is the kind of problems that you are having (To 
me, it sounded warbled, like a really bad MP3), but you might want to 
check and make sure that those settings are turned off before doing 
anything drastic.

On Thursday, August 14, 2003, at 12:11  PM, Reza Naima wrote:

> I get a ton of distortion when I use these settings.  Going to '80%'
> rather than '100%' work a lot better for me (built-in sound for 
> pundit)...
>
> Reza
>
> On Thu, Aug 14, 2003 at 09:32:25AM -0500, Frank Martelli sent me 
> this...
>> I think the mixer is set OK -- I used the commands from section 7.2 
>> of the
>> HowTo:
>>
>> $ amixer set Master,0 100%,100% unmute
>> $ amixer set Line,0 75%,75% mute captur
>> $ amixer set Capture,0 100%,100% mute captur
>> $ su
>> # alsactl store
>> # exit
>>
>> The test 'aplay /dev/dsp' while running xawtv results in the same 
>> problem.
>>
>> Possibly this is an issue with the ALSA driver?
>>
>> -T
>>
>>> On Thu, 2003-08-14 at 15:05, Frank Martelli wrote:
>>>>
>>>> When I 'watch TV' the audio is only good for ~2 seconds
>>>> -- it then begins to 'echo,' where the first two seconds of audio 
>>>> are
>>>> apparent in the loop (overlayed with new audio) until the audio 
>>>> stream
>>>> degrades into unintelligible 'ringing'.
>>>>
>>>> If I actually record a program, I can then watch my recording 
>>>> without
>>>> problem.  However, if I begin to playback a recording in-progress, 
>>>> the
>>>> playback is fine until I hit the point where (real-time) I began the
>>>> playback (i.e., the recording becomes corrupt when I start using the
>>>> audio for output).
>>>>
>>>> Has anyone seen this problem before?  I am using the latest ALSA
>>>> (0.9.6) and MythTV (0.10) versions under the 2.4.18 kernel.  Does 
>>>> this
>>>> simply mean that my on-board audio is too feeble for MythTV?  Is 
>>>> this
>>>> a general problem with the sis7012 soundcard?  Or do I just have 
>>>> some
>>>> mixer setting all-wrong?
>>>>
>>>
>>> It sounds like you have your recording input set wrongly on your 
>>> sound
>>> card. You need to have it set just to record the line input. If you 
>>> set
>>> it to record everything you will find myth records it's own output 
>>> and
>>> plays it back over itself until you are in feedback hell!
>>>
>>> Just change this setting using your favourite mixer (kmixer, gmix,
>>> smixer) and hopefully that will help.
>>>
>>> Adam.
>>>
>>>
>>>> Thanks!
>>>>
>>>> -Frank
>>>>
>>>>
>>>>
>>>>
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>>
>>
>>
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--- darco
http://www.deepdarc.com/