[mythtv-users] AC3 Passthru doesn't work on Nforce4 ALC850

ubulid00 ubulid00 at fastmail.fm
Sat Sep 16 20:35:23 UTC 2006




Branden Stanley wrote:
> 
> I struggled with this as well with my K8N neo4 platinum. I believe the
> combo that "worked" was using the guide:
> http://www.mythtv.org/wiki/index.php/Enabling_nForce4_optical_SPDIF_output
> 
> Then:
> yum install alsamixergui
> run alsamixergui
> set all 'IEC958' to zero
> Then the thing that worked was untick the red dots above the 'IEC958'
> that only show up in alsamixergui
> Set Myth audio to:
> ALSA:spdif
> default for the mixer
> Enable ac3 passthrough
> 
> Done.
> 
> **the mixer was crashing on me so I needed to kill and reload the app
> 4 times to get everything sorted out...
> 

Thanks Branden,
I might be getting closer, but still no sound. I've followed all your
suggestions, and it cleared up an error message, but this is what I now see
when watching a AC3 HD recording.  Note the 'AO: KillingAudioOutputDSP'
entry.  Other than that it looks mostly ok. This is with 'mythfrontend -v
audio'.  What do you  (or any one else) think? 

2006-09-16 14:27:31.580 TV: Attempting to change from None to
WatchingPreRecorded
0: start_time: 5235.299 duration: 485.667
1: start_time: 5235.253 duration: 485.678
stream: start_time: 58169.473 duration: 5396.818 bitrate=15651 kb/s
2006-09-16 14:27:31.645 AFD: Opened codec 0xb587c0, id(MPEG2VIDEO_XVMC)
type(Video)
2006-09-16 14:27:31.646 AFD: Opened codec 0x8b9c70, id(AC3) type(Audio)
2006-09-16 14:27:31.646 AFD: Audio Track #1 is A/V stream #1 and has 2
channels in the English language(6647399).
2006-09-16 14:27:31.646 AFD: Selected track 1: English AC3 2ch (A/V Stream
#1)
2006-09-16 14:27:31.646 AFD: Initializing audio parms from audio track #1
2006-09-16 14:27:31.646 AFD: Audio format changed 
                        from id(NONE)    -1Hz -1ch   0bps    ; id(NONE)   
-1Hz -1ch   0bps   
                        to   id( AC3) 48000Hz  2ch  16bps pt ; id( AC3)
48000Hz  2ch  16bps pt
2006-09-16 14:27:31.647 AO: Killing AudioOutputDSP
2006-09-16 14:27:31.648 Opening ALSA audio device 'spdif'.
2006-09-16 14:27:31.648 in SetParameters(format=2, channels=2, rate=48000,
buffer_time=500000, period_time=125000)
2006-09-16 14:27:31.649 get_buffer_size returned 16384
2006-09-16 14:27:31.649 set_period_time_near returned 85333
2006-09-16 14:27:31.649 get_period_size returned 4096
2006-09-16 14:27:31.650 Opening mixer default
2006-09-16 14:27:31.651 Setting Master volume to 70
2006-09-16 14:27:31.651 Volume range is 0 to 31, mult=3.22581
2006-09-16 14:27:31.651 channel 0 vol set to 22
2006-09-16 14:27:31.652 Setting Master volume to 70
2006-09-16 14:27:31.652 Volume range is 0 to 31, mult=3.22581
2006-09-16 14:27:31.652 channel 1 vol set to 22
2006-09-16 14:27:31.652 Setting PCM volume to 100
2006-09-16 14:27:31.652 Volume range is 0 to 31, mult=3.22581
2006-09-16 14:27:31.652 channel 0 vol set to 31
2006-09-16 14:27:31.652 Setting PCM volume to 100
2006-09-16 14:27:31.652 Volume range is 0 to 31, mult=3.22581
2006-09-16 14:27:31.652 channel 1 vol set to 31
2006-09-16 14:27:31.652 Volume range is 0 to 31, mult=3.22581
2006-09-16 14:27:31.652 AO: Audio fragment size: 6144
2006-09-16 14:27:31.653 AO: Audio Stretch Factor: 1
2006-09-16 14:27:31.653 AO: Ending reconfigure
2006-09-16 14:27:31.664 AO: kickoffOutputAudioLoop: pid = 32356
2006-09-16 14:27:31.665 AO: OutputAudioLoop: Play Event
2006-09-16 14:27:31.665 AO: Broadcasting free space avail
2006-09-16 14:27:31.674 AO: Broadcasting free space avail
2006-09-16 14:27:31.684 AO: Broadcasting free space avail
2006-09-16 14:27:31.688 AO: Broadcasting free space avail


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