[mythtv-users] Does SPDIF Input generally work?
Ken Scales
kscales at xplornet.com
Wed Aug 29 18:06:14 UTC 2007
Mitch Gore wrote:
> On 8/29/07, *Bearcat M. Sandor* <HomeTheater at feline-soul.com
> <mailto:HomeTheater at feline-soul.com>> wrote:
>
> Folks,
>
> I've been looking all over the wiki for this one and i can't find it.
> Provided that i get a sound card that is well supported, will
> MythTV record
> tv audio using the spdif input? Can i expect any problems with
> this? It
> appears to be just fine, but i'm about to make a purchase of an
> m-audio usb
> soundcard and it only has spdif in.
>
> Thank you,
>
> Bearcat M. Sandor
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>
>
>
> i would assume it would work but i have to ask what are you recording
> that has digital sound and the sound isn't built into the steam as in
> HDTV recorded via firewire or QAM or antenna.
>
> Mitchell
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I'm not the OP, but one example: my ExpressVu PVR5100 ( = Echostar
PVR501) records the AC3 soundtrack when transmitted, and plays back with
s-video and spdif (as well as analogue sound of course). My older 4700
receiver also has spdif output. I'd like to try capturing the spdif and
mplex-ing it with my video recordings, like Bearcat is proposing, so
that I could put them onto my much larger Myth storage without losing
the DD surround. (Aside: yes, I'm familiar with "PVRexplorer", but I'm
not running Mac or Windows right now.)
I expect some sync issues, but as long as both "tracks" are stable
timewise (granted, a big hope), adjusting for a time-delay between them
can be done with available tools (probably manually at first).
So, to echo Bearcat's request, is there a recommended way of setting up
and capturing spdif audio? (Even something as crude as "cat < /dev/dsp2
> filename.ac3" -- to start exploring the possibilities of doing this.)
It could be an interesting project to work on over the winter months...
Ken.
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