[mythtv-users] AC3 and/or S/PDIF (again)

Marius Schrecker marius at schrecker.org
Tue Jan 24 20:53:54 UTC 2006


> On Tuesday 24 January 2006 01:52, Michael T. Dean wrote:
>> 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)?
>>

Soes  ~/.asoundrc take FULL precedence when both are present, or should
/etc/asound.conf be removed?


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