[mythtv-users] AC3 and/or S/PDIF (again)
Michael T. Dean
mtdean at thirdcontact.com
Tue Jan 24 06:52:02 UTC 2006
On 01/23/2006 11:01 PM, Mario Limonciello wrote:
>>> 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
What are you using for an ALSA conf (~/.asoundrc or /etc/asound.conf)?
More information about the mythtv-users