Mailing List Archive: MythTV: Dev

Mythtv does not set the non-audio bit for ac-3 surround

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bas.wielens at arcor

Mar 21, 2008, 4:59 PM

Post #1 of 2 (711 views)
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Mythtv does not set the non-audio bit for ac-3 surround

Hello,

i've been trying for days now to get the surround working in mythtv when playing dvd's. I've tried everything i found in google, with no result. My receiver (Sony) does not indicate surround when playing a dvd.

I've set the the passthrough output device to 'Default' (also tried ALSA:iec958, ALSA:iec958{AES0 0x06}, ALSA:iec958{AES0 0x02}, ALSA:spdif, ALSA:surround51, ...) non worked...If i would set the non-audio bit by hand, using the 'iecset audio 0' it actually worked using the 'Default' passthrough device. My receivers blue light comes up and i get full ac-3 surround. The only drawback is that i have to set this manual inside a shell each time i want to play a dvd and i have to set it back manual using 'iecset audio 0' if i want to listen to music. This is really unpractical...

I've tried all the 'hints' i found with google, including messing arround with .asoundrc etc...no positive result :( Does anybody know a solution that works for this problem, or am i the only one that has this?.

aplay -L says:
front:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Front speakers
surround40:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.0 Surround output to Front and Rear speakers
surround41:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
null
Discard all samples (playback) or generate zero samples (capture)

aplay -l says:
**** List of PLAYBACK Hardware Devices ****
card 0: CK804 [NVidia CK804], device 0: Intel ICH [NVidia CK804]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: CK804 [NVidia CK804], device 2: Intel ICH - IEC958 [NVidia CK804 - IEC958]
Subdevices: 1/1
Subdevice #0: subdevice #0

Thanks!!!!

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mtdean at thirdcontact

Mar 21, 2008, 8:56 PM

Post #2 of 2 (684 views)
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Re: Mythtv does not set the non-audio bit for ac-3 surround [In reply to]

On 03/21/2008 07:59 PM, Bas Wielens wrote:
> i've been trying for days now to get the surround working in mythtv when playing dvd's. I've tried everything i found in google, with no result. My receiver (Sony) does not indicate surround when playing a dvd.
>
> I've set the the passthrough output device to 'Default' (also tried ALSA:iec958, ALSA:iec958{AES0 0x06}, ALSA:iec958{AES0 0x02}, ALSA:spdif, ALSA:surround51, ...) non worked...If i would set the non-audio bit by hand, using the 'iecset audio 0' it actually worked using the 'Default' passthrough device. My receivers blue light comes up and i get full ac-3 surround. The only drawback is that i have to set this manual inside a shell each time i want to play a dvd and i have to set it back manual using 'iecset audio 0' if i want to listen to music. This is really unpractical...
>

Anytime you specify the bit 0x02 for AES0, you're telling your sound
card to set the IEC958 status bit to specify non-audio. Therefore, both
when you specified ALSA:iec958{AES0 0x06} and ALSA:iec958{AES0 0x02} ,
you were specifying the non-audio bit.

There's likely a misconfiguration of your sound card, and not a bug in
Myth. (Though I will admit that there are many ways Myth's ALSA support
could be improved, all of those ways I'm thinking of are feature
requests and not bugs.) Therefore, I recommend you ask on the
mythtv-users list (
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users ). Doing so
also has the nice benefit that more eyes will see your posts, so the
person who has your answer is more likely to see it.

Mike
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