[mythtv-users] "Woodchuck" sound on TV playback

John Welch jrw3319 at gmail.com
Sun Aug 17 20:17:01 UTC 2008


On Sun, Aug 17, 2008 at 3:50 PM, Michael T. Dean
<mtdean at thirdcontact.com> wrote:
> On 08/17/2008 03:01 PM, John Welch wrote:
>> Yes!  Thank you, thank you, thank you!  My problem is solved.  The
>> keys were the changes in steps 3 & 4.
>>
>> Maybe this is explained elsewhere, but I couldn't find it, so can
>> anyone tell me what "ALSA:iec958:(AESO 0x02)" means, particularly the
>> "AES 0x02" part?
>
> Says to set the IEC958 status bit for data type to non-audio (i.e.
> encoded audio formats, like AC-3 or DTS).
>
>>   Also, can anyone tell me how to pass this along to
>> mplayer?
>
> Well, you can do it like you're doing with Myth, by specifying a
> partially correct***, but completely unintelligible, /ALSA/
> configuration string within the settings for that one application
> (something like:  mplayer -ao "alsa:device="iec958={CARD 0 AES0 0x02}"
> -ac hwac3, /path/to/file), or you can set up your ALSA configuration
> correctly and give the configuration a useful and easy to remember name,
> like "passthrough" that can be used for any and all applications (i.e.
> Myth "Passthrough output device" would be "passthrough", mplayer could
> be started with mplayer -ao alsa:device=passthrough -ac hwac3,
> /path/to/file).
>
> Oh, but wait, I must not know what I'm talking about because the wiki
> says that you don't need an ALSA configuration file...
>
> Mike "doing it wrong because he puts ALSA configuration in the, er, ALSA
> configuration file" Dean
>
> *** "partially correct" meaning that you really should specify all the
> IEC958 status bits because someone may have left them set for some other
> type of audio...  For Myth's HDTV recordings, AES0 0x06, AES1 0x82, AES2
> 0x00, AES3=0x02 is probably what you'd want.
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Thanks for the explanation Mike.  BTW, I have had success using an
ALSA configuration file in the past, so I'm certainly not calling you
"wrong".  It just didn't seem to be working for me in this case; hence
my calls for help.


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