[mythtv-users] Record AC3 from Satellite SPDIF In Help

[stan]

Thanks Mike.

I just verified what you said.  I unplugged my audio loopback cable
(connecting PVR-350 audio out to mobo line-in) and recorded from (1) RF
input and (2) s-video/analog audio input.  Then I plugged the loopback cable
back in and played back the two recordings. AUDIO WAS IN THE RECORDED MPEG'S
just as you would have predicted.

Dawgone.

Is there another thread on synchronization (assuming I figure out how to
read the spdif input)?  I'm guessing once the video/spdif time delta is
established it wouldn't vary because the s-video and spdif are in sync when
they leave the satellite box (as least within the range my brain can adapt
to).

So, I'm thinking you would basically

1.  Start the mpeg stream coming in from the PVR-x50
2.  As quick as you can start the spdif stream coming in.

Have a tuning function where the user could move a slider until A/V looks
synchronized.  Then use this delta all the time to add the spdif stream to
the mpeg stream obtained from steps 1 and 2.

Am I reinventing the wheel?

Does MythTV deal with capture cards that don't have hardware encoding?  Does
MythTV get separate audio and video streams then, or does some driver handle
mixing the audio and video for Myth?

--stan

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Michael T. Dean
> Sent: Friday, May 26, 2006 12:00 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Record AC3 from Satellite SPDIF In Help
> 
> On 05/26/2006 02:42 PM, stan wrote:
> > I'm very interested in this too.  I have a PVR-350 which I 
> think has the
> > same inputs as the PVR-250.
> >
> > I feed the PVR-350 with two different inputs:  Rooftop 
> antenna and Dish
> > satellite set top box.
> >
> > The roof antenna goes to the rf-in on the PVR-350.
> >
> > The satellite box goes to both the s-video and analog sound 
> inputs on the
> > PVR-350.  I think the PVR-350 loops the analog signal back 
> to the PVR-350's
> > audio output which I connect to the mobo analog sound line-in.
> >
> > The satellite box also has spdif output that I'd like to 
> use instead of it's
> > analog sound output, but I need to retain the ability of 
> capturing the
> > analog sound from the RF input.
> >
> > I don't know what to ask about in terms of mythTV 
> capabilities because I
> > don't know how the PVR-350 is basically working:
> >
> > 1.  (1A) Does the PVR-350 hardware encode both the audio 
> and video from the
> > RF signal
> ...
> > 1A.  RF-in  ->  PVR-350 -> audio and video mpeg
> >   
> Yes.
> > 2.  (2A) Does the PVR-350 hardware encode the s-video input 
> mixed with the
> > analog sound input
> ...
> > 2A.  S-video-in + analog audio in -> PVR-350 -> audio and video mpeg
> >   
> Yes.
> > I think we need to know how the above stuff is working 
> before we know what's
> > needed to use spdif rather than analog sound input.
> 
> Basically, the hardware doesn't support recording from a 
> digital input, 
> so you would have to record video and analog audio into an 
> MPEG with the 
> PVR-x50 and record AC-3 some other way.  Then, you would have 
> to mux the 
> AC-3 stream into the existing MPEG file--while maintaining sync.
> 
> This is exactly why the first responder said the problem is 
> maintaining 
> sync.
> 
> Mike
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