[mythtv-users] Myth can't passthrough digital audio, but xine and mplayer can

[Marc]

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of Ray Lischner
> Sent: Saturday, January 19, 2008 7:56 PM
> To: mythtv-users at mythtv.org
> Subject: Re: [mythtv-users] Myth can't passthrough digital audio, but
> xine and mplayer can
> 
> Thank you for all the help. A funny thing happened last night. I was
> fiddling with the settings, without luck. I thought I had reset
> everything to 2-Channel PCM and went to bed. My 3-year-old woke me up
> to tell me that there was no sound. The settings seemed to be correct.
> Xine would still play pass-through audio, but Myth would not play
> non-pass-through audio.
> 
> I had read through the advice on this list, so on a whim, I
> stuck "ALSA:spdif" as the pass-through device and enabled AC3 and DTS
> pass-through. Now pass-through works in Myth.
> 
> I'm afraid to touch anything to try to better understand why it works
> now and didn't work before. Just for the record, here is aplay -l:
> 
> **** List of PLAYBACK Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 1: STAC92xx Digital [STAC92xx
> Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> 
> The reason I hadn't tried ALSA:spdif earlier is because aplay -L
> doesn't
> list spdif:
> 
> default:CARD=Intel
>     HDA Intel, STAC92xx Analog
>     Default Audio Device
> front:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     Front speakers
> surround40:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     4.0 Surround output to Front and Rear speakers
> surround41:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=Intel,DEV=0
>     HDA Intel, STAC92xx Analog
>     7.1 Surround output to Front, Center, Side, Rear and Woofer
> speakers
> null
>     Discard all samples (playback) or generate zero samples (capture)
> --
> Ray Lischner
> 
Ray my aplay -L doenst have a spdif either.
asgard ~ # aplay -L
front:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    Front speakers
surround40:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    4.0 Surround output to Front and Rear speakers
surround41:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
null
    Discard all samples (playback) or generate zero samples (capture)

Myth is set to use "ALSA:iec958" on my system but as you can see above aplay
says it does not exist. It is however in the dropdown in the mythfrontend as
a passthrough device.
I'm going to send you a message off list with a modified version of the
script from the wiki that should theoretically work in your configuration.

Marc