[mythtv-users] HDMI ac3 passthough audio

Joel Means means.joel at gmail.com
Tue Feb 10 22:27:22 UTC 2009

On Tue, Feb 10, 2009 at 2:13 PM, Andrew Close <aclose at gmail.com> wrote:
> On Tue, Feb 10, 2009 at 11:50 AM, James Armstrong
> <james at thearmstrongs.org> wrote:
>>> 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)"?
>>> J
>> I have had the exact same problem. Can get hdmi audio, but if I enable
>> passthrough get clicking / pops
> what distro are you guys using?
> what version of ALSA are you using?
> what sound processor/controller/card do you have in your system that
> is feeding SPIF/HDMI?
> --
> Andrew Close
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> mythtv-users at mythtv.org
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I am using Mythbuntu 8.04 with Alsa-1.0.18a (self-compiled) and NVidia
180.22 driver.  "aplay -l" shows ALC888 controller.  It is onboard an
ABIT AN-M2HD (LE) motherboard (GeForce 7050PV/ nForce 630a).


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