[mythtv-users] HDMI ac3 passthough audio

[Joel Means]

On Mon, Feb 9, 2009 at 6:16 PM, JP Fournier <jape41 at gmail.com> wrote:
> Hi All,
>
> After I got some help from the radeonhd driver list, I am now able to play ac3
> audio over HDMI with mplayer via a command line like this:
>
> mplayer -ac hwac3 -ao alsa:device=iec958=1 -vo xv -fs 2041_20090208074700.mpg
>
> Can anyone help me figure out what the equivalent settings under mythtv would
> be? Obviously I've tried a few variations, but the best I can get is clicky
> static.
>
> regards,
>
> jp
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I think that the answers given don't address what the issue is here.
I am not at home, so I can't try the given line out, but I will tell
you my problem with audio over HDMI.  I can get regular audio to work
using hw:0,3 or any number of variations on that.  I cannot, however,
get S/PDIF passthrough to work over HDMI, only over my standard
optical out.  I always just get clicking noises.  It is passing the
digital as an analog signal.  I think the key in the line JP used is
"alsa:device=iec958=1".  In alsamixer, I have "iec958", "iec958
default", and "iec958 1" all listed but I have never found how to tell
anything to use "iec958 1" as the device.  I will try it out tonight
and see if it will give my proper passthrough or not, but I think that
this may be the problem.  So, the question then would be, is there any
way to address "iec958 1" as the passthrough device, a la
"ALSA:iec958(AES0 0x02)"?
Joel

P.S.  JP, what mobo are you using?