[mythtv-users] AC3 and/or S/PDIF (again)
Mario Limonciello
mario.mailing at gmail.com
Tue Jan 24 04:01:58 UTC 2006
> > A quick question if I may. Am I right in thinking that if I buy a new
> > sound-card with 6 analogue channels on the output it will drive my 5.1
> > amp (it has 6 channel input) for surround sound.
> Yes (assuming you mean by 6-channel input that you have at least 6 RCA
> connectors or 3 headphone connectors for input).
>
> Note, though, that many cards use line in for surround output in
> surround modes, so if you've got a software encoder that requires a
> sound card for audio, you may have to keep your on-board card enabled as
> well for sound capture.
> > i.e. I guess I am asking does myth decode the 5.1 happily from DVDs
> > and from DVB-T broadcasts?
> Yep. It's been doing this for a long time--just disable AC-3 pass
> through. Mark Spieth recently created a patch to support timestretch
> with multi-channel streams. He did the analog patch in no time, but
> it's the re-encoding to AC-3 that's taking some time. I don't think the
> patch has been put in SVN, yet, though, so it may not make it into 0.19.
On this exact note - I was having trouble just today with a recent SVN
release attempting to do 5.1 native from myth the analogue route.
I have a HD5000 that records a few streams with 5.1. I also have xine
setup to use the analogue 5.1 outputs to drive my receiver for dvds.
Now in myth, when I change from ALSA:default to ALSA:surround51 (which I
use for xine), I get no audio in myth. If I try to force it to the
exact pcm available for my card, ALSA:hw:0,3 I also get no audio. Is
there something else I'm missing here?
Here is relavent info from my mythfrontend console output:
2006-01-23 21:59:58.595 Opening audio device 'hw:0,3'.
2006-01-23 21:59:58.637 Access type not available: Invalid argument
2006-01-23 21:59:58.637 Unable to set ALSA parameters
2006-01-23 21:59:58.637 NVP: Disabling Audio, reason is: Unable to set
ALSA parameters
And relavent info about my card:
supermario at supermario ~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Audigy2 [Audigy 2 Platinum [SB0240P]], 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 Platinum [SB0240P]], device 2: emu10k1 efx
[Multichannel Capture/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 Platinum [SB0240P]], device 3: emu10k1
[Multichannel Playback]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Audigy2 [Audigy 2 Platinum [SB0240P]], device 4: p16v [p16v]
Subdevices: 1/1
Subdevice #0: subdevice #0
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