[mythtv-users] OT: Probably dumb question about digital sound out

James Oltman cnlibmyth at gmail.com
Tue Sep 6 16:26:39 UTC 2005


I have that exact motherboard in my FE machine. It will pass out any AC3 
audio stream. What it means by 5.1 is that you can actually have the onboard 
sound pass out the individual channels through it's various audio plugs. But 
throught the digital out, you can do 5.1 and 7.1 directly from DVDs/HDTV. As 
far as games go, I think it will only be 5.1.

On 9/4/05, Robert Denier <denier at umr.edu> wrote:
> 
> On Sat, 2005-09-03 at 21:04 -0400, Ryan Steffes wrote:
> > Digital audio is digital audio, correct?
> 
> Sort of. That is a lame answer, but sometimes going digital with the
> audio makes things a bit more messy. To support all the fancy features
> on your sound card your almost certainly going to need to use alsa,
> which you should normally be by now anyway. It is also possible to
> sometimes specify a specific port to output with using alsa like the
> digital port. Here is the mplayer example for doing that. Of course
> sometimes digital just works so ymmv.
> 
> -ao alsa commandline help:
> Example: mplayer -ao alsa:mmap:device=hw=0.3
> sets mmap-mode and first card fourth device
> 
> Options:
> mmap
> Set memory-mapped mode, experimental
> noblock
> Sets non-blocking mode
> device=<device-name>
> Sets device (change , to . and : to =)
> 
> > As in the the sound in the source defines the number of channels, not
> > the hardware?
> 
> Well I've seen avi's have ac3 audio, and with a bit of work that can be
> sent right out the port, and in my case make the pretty blue light come
> on in my receiver for dolby digital sound. I'm sure dvd's are the same
> kind of thing.
> 
> > I'm finally getting the stereo I want (I love my wife, best birthday
> > present ever!) with digital in and all that, but my computer doesn't
> > have digital out. I've had some motherboard wonkiness anyway, so I
> > was considering just replacing the motherboard and getting one with
> > digital out and a gigabit ethernet port, such as the ASUS A7N8X-E
> > Deluxe.
> 
> I've got the same board and it is a good board. I've not tried much
> with the audio on it though. If you already have a newer 2GHz + cpu
> that is probably fine. If you have a sub 1Ghz cpu, then it might be a
> grayer area as to what is best. This is a dual channel board, so, in
> theory, if you put 2 matched memory sticks in the correct slots it will
> help a little.
> 
> > The motherboard advertises as "6 Channels" which I assume they mean
> > 5.1. My stereo is going to be 7.1, but the digital out on the
> > motherboard will do just fine, right?
> 
> I'm not sure. I suspect if your just using your card to pass
> precompressed audio from a video file it could, in theory, handle 7.1 or
> whatever. Of course if the card says 5.1 then the best you could hope
> for a game to generate is 5.1 and then its anyones guess if that would
> be generated on the digital output. Perhaps someone else knows.
> 
> > There's not a difference on the digital side because it's a straight
> > pass through, correct?
> 
> As a final note, it is worth noting that while a lot of dolby digital
> things are cool and what have you, that much of what is on tv doesn't
> support it, and sometimes rear speakers and such are just annoying. (I
> haven't bothered to even connect mine.) It really kinda depends on what
> you watch the most.
> 
> 
> 
> 
> 
> 
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> 
>
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