[mythtv-users] alsa 1.0.24, 0.24.2-fixes, ubuntu lucid, hdmi audio, AC3/DTS not working

[Steven Adeff]

upgraded a machine to 1.0.24 which is connected to a denon receiver
with HDMI and I'm trying to get the audio working.

it works fine in mplayer with
-ao alsa:device=plughw=1.7
for ac3, dts, and stereo PCM

in Myth though, I can only seem to get stereo audio to work.
I scan audio devices and try the various
ALSA:hdmi:CARD=NVidia_1,DEV=0
ALSA:hdmi:CARD=NVidia_1,DEV=1
ALSA:hdmi:CARD=NVidia_1,DEV=2
ALSA:hdmi:CARD=NVidia_1,DEV=3

in the frontend log, with audio logging enabled, when I play an ac3
recording using ALSA:hdmi:CARD=NVidia_1,DEV=1 which should be 1,7 I
get this:

2012-02-20 18:43:56.522 AFD: Opened codec 0x9d055420, id(MPEG2VIDEO) type(Video)
2012-02-20 18:43:56.522 AFD: codec AC3 has 6 channels
2012-02-20 18:43:56.523 AFD: Opened codec 0x9bd78a80, id(AC3) type(Audio)
2012-02-20 18:43:56.523 AFD: codec AC3 has 1 channels
2012-02-20 18:43:56.524 AFD: Opened codec 0x9d38de30, id(AC3) type(Audio)
2012-02-20 18:43:56.643 AO: Opening audio device
'hdmi:CARD=NVidia_1,DEV=1' ch 6(6) sr 48000 sf signed 16 bit reenc 1
2012-02-20 18:43:56.645 ALSA, Error: Setting hardware audio buffer size to 320
2012-02-20 18:43:56.646 ALSA, Error: Error opening
/proc/asound/card1/pcm7p/sub0/prealloc: Permission denied.
2012-02-20 18:43:56.646 ALSA, Error: Try to manually increase audio
buffer with: echo 320 | sudo tee
/proc/asound/card1/pcm7p/sub0/prealloc
2012-02-20 18:43:56.646 ALSA, Error: Unable to sufficiently increase
ALSA hardware buffer size - underruns are likely
2012-02-20 18:43:56.817 AudioPlayer: Enabling Audio

but the receiver only receives the left and right channel and it says
it's in PCM

if I try the others I don't get anything.

anyone have any idea what's going on?


-- 
Steve
http://www.mythtv.org/wiki/User:Steveadeff
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