[mythtv-users] Asus A8N-VM board + Alsa AC3 SPDIF

Henry A Harper III hah at alumni.rice.edu
Wed Jan 17 18:20:58 UTC 2007


> On 16/01/07, Venkat Bihari <venkat_bihari at hotmail.com> wrote:
> >
> > Hi!
> >
> > I've been trying to get 5.1 SPDIF working on my Asus A8N-VM CSM
> board with
> > the optional SPDIF/optical module. I'm using FC6 (2.6.18 kernel) and
> > MythtV-0.20 (yum rpm install). I can get only 2-channel sound
> through SPDIF
> > and when I check the box marked to "allow AC3 to SPDIF passthru" in
> > Mythfrotnend -> Setup -> General, all I hear is a low-frequency
> buzz through
> > the front-speakers. When I uncheck that option, I get excellent
> 2-channel
> > sound via the coaxial cable to my receiver, but never 5.1. In
> other words,
> > AC3 passthru is not working for me. I've confirmed that it's not the
> > receiver (I hooked the same input coax to a DVD player and get proper
> > dolby-digital 5.1)
>
> What's your output from
>
> # aplay -l
>
> # aplay -L |egrep "spdif|iec958"
>
> # grep "pcm.digital-hw" -A 3 /etc/asound.conf
>

I am having a similar PCM-good/AC3-bad issue on my Gigabyte GA-M55plus-S3G
w/ Creative Audigy 2 ZS:

[mythtv at myth1 video]$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Audigy2 [Audigy 2 ZS [SB0350]], device 0: emu10k1 [ADC
Capture/Standard PCM Playback]
  Subdevices: 32/32
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
  Subdevice #8: subdevice #8
  Subdevice #9: subdevice #9
  Subdevice #10: subdevice #10
  Subdevice #11: subdevice #11
  Subdevice #12: subdevice #12
  Subdevice #13: subdevice #13
  Subdevice #14: subdevice #14
  Subdevice #15: subdevice #15
  Subdevice #16: subdevice #16
  Subdevice #17: subdevice #17
  Subdevice #18: subdevice #18
  Subdevice #19: subdevice #19
  Subdevice #20: subdevice #20
  Subdevice #21: subdevice #21
  Subdevice #22: subdevice #22
  Subdevice #23: subdevice #23
  Subdevice #24: subdevice #24
  Subdevice #25: subdevice #25
  Subdevice #26: subdevice #26
  Subdevice #27: subdevice #27
  Subdevice #28: subdevice #28
  Subdevice #29: subdevice #29
  Subdevice #30: subdevice #30
  Subdevice #31: subdevice #31
card 0: Audigy2 [Audigy 2 ZS [SB0350]], device 2: emu10k1 efx [Multichannel
Capure/PT Playback]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: Audigy2 [Audigy 2 ZS [SB0350]], device 3: emu10k1 [Multichannel
Playbac]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Audigy2 [Audigy 2 ZS [SB0350]], device 4: p16v [p16v]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
[mythtv at myth1 video]$ aplay -L |egrep "spdif|iec958"
iec958 'cards.pcm.iec958'
spdif 'cards.pcm.iec958'
[mythtv at myth1 video]$ grep "pcm.digital-hw" -A 3 /etc/asound.conf
[mythtv at myth1 video]$

I need a rule for rate translation, is that right? I can't figure out where
to look for my card's info (alsa-project.org didn't help me) and pasting
random other people's settings in doesn't work too well.

I don't have a ~/.asoundrc, have tried various permutations of one from the
wiki without success. I'm using ALSA 1.0.11rc2 (FC5) apparently,
mythconverg.AudioOuputDevice = ALSA:default and
mythconverg.PassThruOutputDevice = default.



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