[mythtv-users] HDMI audio working in Firefox/Flash, but not MythTV

[Laura Donovan Bannister]

Hi guys,

Sorry to post yet another audio question, but I've spent countless hours
trying to figure this out with no luck. I just built my first Mythbuntu 9.04
box, with the onboard sound passing audio to the Nvidia 9500GT card via
SPDIF. I ran an HDMI cable from the Nvidia card to the TV. HDMI audio is
working fine when I watch Flash apps like Hulu and YouTube in Firefox, but I
can't seem to get audio working in MythTV. I've tried every combination of
settings I could think to try on the audio configuration page, but nothing
seems to work. I also ran alsamixer to make sure that all channels were
unmuted. This is my first MythTV install, and so I'm wondering if I've
missed something simple :)

Here are the current audio settings I'm using:

Audio output device: ALSA:spdif (I've tried all the other ones too)
Passthrough output device: ALSA:iec958:{ AES0 0x02 }
Max Audio Channels: 5.1
Upmix: Passive
Enable AC3 to SPDIF passthrough (checked)
Enable DTS to SPDIF passthrough (checked)
Agressive Sound card Buffering (unchecked)
Use internal volume controls (unchecked)

I've used two different /etc/asound.conf files. Both work fine with
Flash/Firefox, but neither made a difference in MythTV.


File 1:

pcm.!default {
        type plug
        slave {
                rate 48000
                pcm "spdif"
                }
}


File 2:

pcm.!default {
        type hw
        card 0
        device 0
}


root at mythtv-backend:/etc# aplay -L
front:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    Front speakers
surround40:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=SB,DEV=0
    HDA ATI SB, ALC883 Digital
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)
root at mythtv-backend:/etc#


Thanks so much for any help!

Sincerely,

-Laura
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