[mythtv-users] mythmusic iec958 help
3gemail at gmail.com
Wed Jul 2 22:33:31 UTC 2008
> I assume (from the alsa file names) you're running Fedora Core 8. If
> that's correct, then the first couple of "Info" boxes on the wiki you
> reference are saying to NOT use a modified .asoundrc file. So go back
> to the original from the FC8 distribution.
> Also, are you using PukeAudio? If so, gert rid of it. It's still too
> "bleeding edge" to use. (There are _lots_ of notes around about how to
> do that.)
> From your note, it sounds like you want to take the CDRom info, output
> it thru the SPDIF connector to a separate amp/receiver/home theater
> receiver/etc. If that's correct, then you want alsa plus the sound card
> to do nothing to the signal; only stuff it into the SPDIF connector.
> You want your receiver to decode and then push it to the speakers.
> Most receivers these days, if they can handle (digital) SPDIF at all,
> can figure out the underlying sample frequency (44.1KHz or 48 KHz), and
> decode it correctly. The problem often comes when the sound card gets
> in the middle and insists on re-coding the CDRom (native) signal as
> being 48 KHz. The result is that the sound is then shifted upward in
> frequency about 10% when the receiver decodes it.
> Now the bad news. IIRC, most soundblaster cards cannot output a 44.1KHz
> signal. So they code everything as 48KHz. I don't like Creative stuff
> so I'm not familiar with the specifics of their cards these days. You
> should be able to google "Soundblaster Live 5.1" and "bit perfect audio"
> and get some useful info on your card's output capabilities. I fear you
> may be in the market soon for a replacement card.
> I had a similar problem awhile back and ended up getting a Turtle Beach
> Riviera card. It was 20 or 30 bucks and "just works" in Linux.
> Once you go back to the original .asoundrc file, get rid of PukeAudio,
> get a soundcard which can output a proper 44.1KHz signal on the SPDIF
> connector (or hopefully find a setting on SB Live card if possible),
> then your MythTV settings above should be OK.
> Good luck and come back here if you have questions.
> Joe Henley
Thanks Joe. It is FC8 will try that tonight. Can't believe I missed
it. And I removed "PukeAudio" :) a while ago.
I will let you know if it works.
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