[mythtv-users] Nvidia 8400GS SPDIF/HDMI pass through.. how?

[jedi]

On Mon, Oct 05, 2009 at 08:47:42PM +0100, Roy Lofthouse wrote:
> 2009/10/5 James Crow <james at ultratans.com>:
> > Roy Lofthouse wrote:
> >>
> >> 2009/10/5 jedi <jedi at mishnet.org>:
> >>
> >>>
> >>> On Mon, Oct 05, 2009 at 04:31:08PM +0100, Roy Lofthouse wrote:
> >>>
> >>>>
> >>>> I've been pulling my hair out at this for two days now, but I can't
> >>>> seem to get my nvidia 8400GS to play sound via the HDMI.
> >>>>
> >>>> I've connected the cable that comes with it from the onboard SPDIF
> >>>> header to the SPDIF (in) of the nv card, but I can't seem to get the
> >>>> thing working..
> >>>>
> >>>> Maybe someone who has experience of this can help me out a bit?? :)
> >>>>
> >>>> Once the cable is connected I presume I should just set my sound to
> >>>> play through the SPDIF connection?
> >>>>
> >>>> aplay -l shows the following:
> >>>>
> >>>> **** List of PLAYBACK Hardware Devices ****
> >>>> card 0: Intel [HDA Intel], device 0: ALC880 Analog [ALC880 Analog]
> >>>>  Subdevices: 1/1
> >>>>  Subdevice #0: subdevice #0
> >>>> card 0: Intel [HDA Intel], device 1: ALC880 Digital [ALC880 Digital]
> >>>>  Subdevices: 1/1
> >>>>  Subdevice #0: subdevice #0
> >>>>
> >>>> and I then run:
> >>>>
> >>>> mplayer -ao alsa:device=hw=0.2 <file> to try and test this, but
> >>>> nothing happens.. (no errors initially when running this)
> >>>>
> >>>
> >>> ...run alsamixer and make sure the HDMI output is not muted.
> >>>
> >>> [deletia]
> >>>
> >>>  Some times, it's just a simple thing.
> >>> _______________________________________________
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> >>> mythtv-users at mythtv.org
> >>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >>>
> >>>
> >>
> >> Everything is unmuted (no HDMI option though, just IEC***)
> >>
> >
> > Because you are passing the spdif audio to the nvidia card the iec958 _is_
> > your hdmi audio. I have the exact same setup and I just set myth to output
> > to ALSA:default and checked the options for AC3 and DTS passthrough. I have
> > nothing connected to the analog sound outputs and only a DVI->HDMI cable
> > connected. Audio plays through the TV speakers. I have no ~/.asoundrc or
> > /etc/asoundrc and iec958 is unmuted. I have to use the TV remote to control
> > sound. The output above from 'aplay -l' looks very much like mine. Try
> > running 'aplay -L' not the _capital_ L. You should see the iec958 listed
> > there.
> >
> > You also should double check the polarity of the SPDIF cable from the MB to
> > the nvidia card. On my MB the SPDIF header is just 4 pins and it would be
> > easy to have the plug backward.
> >
> > Cheers,
> > James
> >
> > _______________________________________________
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> >
> 
> IEC958 does show in aplay -L

Run aplay and play a wav file using different outputs and see what happens.
If your alsa defaults are set up correctly, you will hear your desired output
when you don't override the device setting on aplay. You can also set the
output device, direct sound directly to you preferred output, and see that
way if it's on/enabled/unmuted.

[deletia]